Patent Publication Number: US-2007105474-A1

Title: Radio control flying toy

Description:
BACKGROUND OF THE INVENTION  
      1. Field of the Invention  
      The present invention relates to a radio control flying toy which can feed air to an airframe on a bottom-surface side to float the airframe along a flat running plane, thereby freely flying the airframe.  
      2. Description of the Related Art  
      Heretofore, Hovercraft (trade name), an air cushion vehicle or the like has been generally known as a ground effect machine or a vehicle which travels utilizing a lift force of an air cushion contained between a bottom surface of an airframe and a running surface such as a ground or water surface on a lower side, or ground effects of wings. As a toy which travels under remote control utilizing a principle of such ground effect machine, the present applicant discloses a technology concerning an air cushion toy in which a skirt portion formed into an expandable/contractible bag shape is attached to a lower peripheral edge of a main body, and air is sucked from the outside by a blower for floating disposed in the main body to introduce the air into a main body bottom part surrounded with the skirt portion. Moreover, the air is introduced into the skirt portion to expand the portion, the main body is accordingly floated, and a blower for propelling is disposed in an upper part of the main body (see, e.g., Japanese Utility Model Publication No. 6-20559 (second to sixth pages, FIGS. 1 to 9)).  
      In the conventional air cushion toy, the air is fed into the skirt portion disposed on the main body lower part peripheral edge by the blower for floating disposed in the main body to expand the skirt portion, the air is fed to the bottom part of the main body surrounded with the skirt portion, and the air is circulated between a lower-part side of the expanded skirt portion and a running surface such as a ground surface to float the airframe from the running surface. Therefore, the blower for floating having a large output has been required for uniformly circulating the air required for expanding or floating the skirt portion. To run the main body and freely change a direction, it has been necessary to dispose two blowers for propelling in the upper part of the main body, or install a mechanism which varies an air feed direction by means of one blower for propelling. Therefore, a large driving power supply is required for driving the blower for flying or propelling, and there is a fear that power consumption increases and flight for a long time cannot be performed.  
     SUMMARY OF THE INVENTION  
      The present invention has been developed in view of the above-described situations, and an object thereof is to provide a radio control flying toy capable of easily floating an airframe and simply controlling a running direction.  
      To achieve the above-described object, according to the present invention, there is provided a radio control flying toy comprising: an airframe formed into a rectangular plate shape and having a bottom surface which is flat on a lower side; first to fourth propellers which are disposed in four corners forming at least a quadrangular shape on the lower side of the airframe and which feed air to a bottom-surface side to float the airframe; first to fourth driving means for driving the first to fourth propellers, respectively; a control unit which individually controls driving outputs of the first to fourth driving means, respectively; a transmitter which transmits a control signal for flight from the outside to the control unit; and a battery which supplies power to the first to fourth driving means and the control unit. The transmitter transmits the control signal for flight to the control unit, and the control unit individually controls the driving outputs of the first to fourth driving means to change rotation speeds of the first to fourth propellers. Accordingly, the airframe can be easily floated, and the running direction can be easily controlled.  
      In the present invention, the airframe is constituted of an upper main body which contains the control unit and the battery and a lower main body disposed under the upper main body and formed into a rectangular plate shape, attaching holes are made in positions of the four corners forming the quadrangular shape of the lower main body, and the first to fourth propellers are disposed in the attaching holes. The first to fourth propellers can be easily disposed in the attaching holes made in positions of the four corners of the lower main body forming the quadrangular shape.  
      In the present invention, the first to fourth propellers include a pair of propellers positioned along one diagonal line of the four corners forming the quadrangular shape of the airframe and rotated in one direction, and a pair of propellers positioned along the other diagonal line and rotated in the other direction. The pair of propellers positioned along one diagonal line and those positioned along the other diagonal line can be rotated in mutually opposite directions to thereby control advancing, backing, or swiveling to the left/right.  
      In the present invention, the first to fourth propellers include a pair of propellers positioned on the right side of the four corners forming the quadrangular shape of the airframe and rotated in one direction, and a pair of propellers positioned on the left side and rotated in the other direction. The pair of propellers positioned on the right side of the four corners and those positioned on the left side are rotated in the mutually opposite directions to thereby control the advancing, backing, or swiveling to the left/right.  
      In the present invention, the transmitter has an operation lever for generating a control signal to individually raise or lower the driving outputs of the first to fourth driving means. The operation lever can generate the control signal to individually raise or lower the driving outputs of the first to fourth driving means.  
      In the present invention, the operation lever has right and left operation levers which rotate the propellers from a perpendicular state toward one side and the other side, and generates the control signal to individually raise or lower the driving output of any of the first to fourth driving means in response to rotating operations of the right and left operation levers to one side and the other side, respectively. The running can be easily controlled by the operations of the right and left operation levers.  
      In the present invention, the transmitter has an operation button for generating a control signal to individually raise or lower the driving outputs of the first to fourth driving means, respectively. The operation button can generate the control signal to individually raise or lower the driving outputs of the first to fourth driving means.  
      In the present invention, the operation button has four operation buttons corresponding to the first to fourth driving means for front, back, left, and right, respectively. The running can be easily controlled by the operations of four operation buttons.  
      In the present invention, the radio control flying toy is provided with: the airframe formed into the rectangular plate shape having the bottom surface which is flat on the lower side; the first to fourth propellers which are disposed in the four corners forming at least the quadrangular shape on the lower side of the airframe and which feed the air to the bottom-surface side to float the airframe; the first to fourth driving means for driving the first to fourth propellers, respectively; the control unit which individually controls the driving outputs of the first to fourth driving means, respectively; the transmitter which transmits the control signal for flight from the outside to the control unit; and the battery which supplies the power to the first to fourth driving means and the control unit. Accordingly, the transmitter transmits the control signal for flight to the control unit, and the control unit individually controls the driving outputs of the first to fourth driving means, respectively, to change rotation speeds of the first to fourth propellers. In consequence, the airframe can be easily floated, and the running direction can be easily controlled. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       FIG. 1  is a perspective view of a radio control flying toy in a first embodiment of the present invention;  
       FIG. 2  is a plan view of the radio control flying toy in the first embodiment of the present invention;  
       FIG. 3  is a sectional view along line A-A of the radio control flying toy of  FIG. 2  in the first embodiment of the present invention;  
       FIG. 4  is a back view of the radio control flying toy in the first embodiment of the present invention;  
       FIG. 5  is a side view of the radio control flying toy in the first embodiment of the present invention;  
       FIG. 6  is a bottom plan view of the radio control flying toy in the first embodiment of the present invention;  
       FIG. 7  is a block diagram showing a control operation of the radio control flying toy in the first embodiment of the present invention;  
       FIG. 8  is an explanatory view of a state in which the radio control flying toy floats in the first embodiment of the present invention;  
       FIG. 9  is an explanatory view of a state in which the radio control flying toy moves forwards in the first embodiment of the present invention;  
       FIG. 10  is an explanatory view of an operation of a transmitter at a time when the radio control flying toy floats in the first embodiment of the present invention;  
       FIG. 11  is an explanatory view of an operation of the transmitter at a time when the radio control flying toy moves forwards in the first embodiment of the present invention;  
       FIG. 12  is an explanatory view of an operation of the transmitter at a time when the radio control flying toy moves backwards in the first embodiment of the present invention;  
       FIG. 13  is an explanatory view of an operation of the transmitter at a time when the radio control flying toy swivels clockwise in the first embodiment of the present invention;  
       FIG. 14  is an explanatory view of an operation of the transmitter at a time when the radio control flying toy swivels counterclockwise in the first embodiment of the present invention;  
       FIG. 15  is a perspective view of a radio control flying toy in a second embodiment of the present invention;  
       FIG. 16  is a plan view of the radio control flying toy in the second embodiment of the present invention;  
       FIG. 17  is an explanatory view of an operation of a transmitter at a time when the radio control flying toy floats in the second embodiment of the present invention;  
       FIG. 18  is an explanatory view of an operation of the transmitter at a time when the radio control flying toy moves forwards in the second embodiment of the present invention;  
       FIG. 19  is an explanatory view of an operation of the transmitter at a time when the radio control flying toy moves backwards in the second embodiment of the present invention;  
       FIG. 20  is an explanatory view of an operation of the transmitter at a time when the radio control flying toy swivels clockwise in the second embodiment of the present invention; and  
       FIG. 21  is an explanatory view of an operation of the transmitter at a time when the radio control flying toy swivels counterclockwise in the second embodiment of the present invention. 
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENTS  
      One embodiment of the present invention will be described hereinafter in more detail with reference to the drawings. FIGS.  1  to  7  are explanatory views of a constitution of a radio control flying toy in a first embodiment of the present invention.  FIG. 1  is a perspective view of the radio control flying toy;  FIG. 2  is a plan view of the radio control flying toy;  FIG. 3  is a sectional view along line A-A of the radio control flying toy of  FIG. 2 ;  FIG. 4  is a back view of the radio control flying toy;  FIG. 5  is a side view of the radio control flying toy;  FIG. 6  is a bottom plan view of the radio control flying toy; and  FIG. 7  is a block diagram showing a control operation of the radio control flying toy.  
      In these drawings, in the first embodiment of the present invention, a radio control flying toy  10  is a flying toy which can be enjoyed by floating and freely flying the toy above a flat running surface  1  such as a ground or water surface in the outdoor, or a floor surface in the indoor. This radio control flying toy  10  is provided with: an airframe  11 ; first to fourth propellers  16   a ,  16   b ,  16   c , and  16   d  which are disposed in positions of four corners forming a quadrangular shape on the lower side of the airframe  11  so as to feed air toward the running surface  1  below; first to fourth driving means  17   a ,  17   b ,  17   c , and  17   d  which drive the first to fourth propellers  16   a ,  16   b ,  16   c , and  16   d , respectively; a control unit  20  which individually controls driving outputs of the first to fourth driving means  17   a ,  17   b ,  17   c , and  17   d , respectively, and which is disposed in the airframe  11 ; a transmitter  30  for transmitting a control signal for flight from the outside to the control unit  20 ; a battery  21  which supplies power to the first to fourth driving means  17   a ,  17   b ,  17   c , and  17   d  and the control unit  20 .  
      The airframe  11  is constituted of an upper main body  12 , and a lower main body  13  disposed under the upper main body  12 , and they are molded of, for example, lightweight plastic materials or the like, respectively. The upper main body  12  is formed into a forwardly or backwardly elongated case shape along a running direction, a circuit substrate constituting the control unit  20 , the battery  21  and the like are contained in the upper main body, and a receiving antenna  22  is attached to an upper portion of the upper main body on a rear side. The lower main body  13  has a flat bottom surface  14  parallel to the running surface  1  on a lower side, front right and left portions of the lower main body in the running direction are protruded forwards into semicircular shapes, rear right and left portions of the lower main body in the running direction are protruded rearwards into semicircular shapes, and the lower main body is entirely formed into a rectangular plate shape. The upper main body  12  is attached to the upper surface of the center of the lower main body  13 . Circular attaching holes  15   a ,  15   b ,  15   c , and  15   d  are made in the positions of four front, rear, right, and left corners forming the quadrangular shape of the lower main body  13  formed into the rectangular plate shape. The first to fourth propellers  16   a ,  16   b ,  16   c , and  16   d  for feeding the air toward the running surface  1  side, respectively, are disposed in these attaching holes  15   a ,  15   b ,  15   c , and  15   d . These first to fourth propellers  16   a ,  16   b ,  16   c , and  16   d  are driven by the first to fourth driving means  17   a ,  17   b ,  17   c , and  17   d , respectively. These first to fourth driving means  17   a ,  17   b ,  17   c , and  17   d  are electric motors disposed in, for example, central positions of the attaching holes  15   a ,  15   b ,  15   c , and  15   d  while driving shafts are protruded downwards, and the first to fourth propellers  16   a ,  16   b ,  16   c , and  16   d  are attached to the driving shafts, respectively. These first to fourth driving means  17   a ,  17   b ,  17   c , and  17   d  are attached to the corresponding attaching holes  15   a ,  15   b ,  15   c , and  15   d  of the lower main body  13  via a plurality of attaching members  18   a ,  18   b ,  18   c , and  18   d  formed into plate shapes. That is, these first to fourth driving means  17   a ,  17   b ,  17   c , and  17   d  are attached to positions where output shafts provided with the first to fourth propellers  16   a ,  16   b ,  16   c , and  16   d , respectively, are directed perpendicularly downwards in the centers of the corresponding attaching holes  15   a ,  15   b ,  15   c , and  15   d . As shown in  FIG. 2 , a pair of the first propeller  16   a  and the fourth propeller  16   d  positioned along one diagonal line of four corners forming the quadrangular shape of the airframe  11  are rotated in the same clockwise direction, and a pair of the second propeller  16   b  and the third propeller  16   c  positioned along the other diagonal line of are rotated in the same counterclockwise direction.  
      The control unit  20  is a control substrate disposed in the upper main body  12  to control running. As shown in  FIG. 7 , the control unit is constituted of: a power switch  19 ; a receiving circuit  23  which receives a control signal transmitted from the transmitter  30  via the antenna  22 ; a control circuit  24  which generates a control signal based on a signal received from this receiving circuit  23 ; a driving circuit  25  which controls driving outputs of the first to fourth driving means  17   a ,  17   b ,  17   c , and  17   d  based on the control signal of this control circuit  24  and the like. The battery  21  disposed inside the upper main body  12  supplies power to the receiving circuit  23 , the control circuit  24 , the driving circuit  25 , and the first to fourth driving means  17   a ,  17   b ,  17   c , and  17   d.    
      The transmitter  30  is a unit which transmits a control signal for running to the control unit  20 , and is constituted of: a power switch  36 ; an operating section  33  which operates to control the running; a signal generation circuit  34  which generates a signal based on the operation of this operating section  33 ; a transmission circuit  31  which transmits a signal from this signal generation circuit  34  as a radio wave; an antenna  35  for transmission; a battery  32  which supplies power to the signal generation circuit  34  or the transmission circuit  31  and the like. As shown in  FIG. 1 , the transmitter  30  has a case section provided with the antenna  35  for transmission and manually held to operate, and the operating section  33  is provided with a right operation lever  37  and a left operation lever  38  which are to be operated with fingertips and which protrude perpendicularly from the surface of the case section. These right and left operation levers  37  and  38  can be rotated vertically with the fingertips against an urging force of a spring or the like from a state perpendicular to a side (upper side) provided with the antenna  35  and an opposite side (lower side). The right operation lever  37  is a lever for controlling driving outputs of the second driving means  17   b  and the fourth driving means  17   d  which are positioned on the right side of the lower main body  13 . The left operation lever  38  is a lever for controlling driving outputs of the first driving means  17   a  and the third driving means  17   c  which are positioned on the left side of the lower main body  13 . When this right operation lever  37  is rotated upwards, the driving output of the fourth driving means  17   d  is raised from usual 60% to about 100%. When the right operation lever is rotated downwards, the driving output of the second driving means  17   b  is raised from usual 60% to about 100%. When this left operation lever  38  is rotated upwards, the driving output of the third driving means  17   c  is raised from usual 60% to about 100%. When the left operation lever is rotated downwards, the driving output of the first driving means  17   a  is raised from usual 60% to about 100%.  
      Next, an operation of the radio control flying toy  10  constituted as described above will be described. FIGS.  8  to  14  are explanatory views of the operation of the radio control flying toy in the first embodiment of the present invention.  FIG. 8  is an explanatory view of a state in which the radio control flying toy floats;  FIG. 9  is an explanatory view of a state in which the radio control flying toy moves forwards;  FIG. 10  is an explanatory view of an operation of a transmitter at a time when the radio control flying toy floats;  FIG. 11  is an explanatory view of an operation of the transmitter at a time when the radio control flying toy moves forwards;  FIG. 12  is an explanatory view of an operation of the transmitter at a time when the radio control flying toy moves backwards;  FIG. 13  is an explanatory view of an operation of the transmitter at a time when the radio control flying toy swivels clockwise; and  FIG. 14  is an explanatory view of an operation of the transmitter at a time when the radio control flying toy swivels counterclockwise.  
      First, to operate the radio control flying toy  10 , the flat bottom surface  14  of the lower main body  13  is disposed on the running surface  1 . Subsequently, when the power switch  19  is turned on, the driving circuit  25  of the control unit  20  drive all of the first to fourth driving means  17   a ,  17   b ,  17   c , and  17   d  with the equal driving output of 60%, all of the first to fourth propellers  16   a ,  16   b ,  16   c , and  16   d  attached to the respective output axes rotate at an equal speed, and air is sent downwards from the respective attaching holes  15   a ,  15   b ,  15   c , and  15   d  toward a running surface  1  side. As shown in  FIG. 8 , the air sent downwards from these attaching holes  15   a ,  15   b ,  15   c , and  15   d  is sent between the flat bottom surface  14  of the lower main body  13  and the running surface  1 . When the air flows toward a periphery of the lower main body  13 , a space is generated in which the air flows between the bottom surface  14  of the lower main body  13  and the running surface  1 , and the airframe  11  floats above the running surface  1  in a stopped state. In this case, the first and fourth propellers  16   a  and  16   d  positioned along one diagonal line, and the second and third propellers  16   b  and  16   c  positioned along the other diagonal line are driven in mutually opposite directions at the equal speed. Therefore, a force for reversing the airframe  11  by rotating the respective first to fourth propellers  16   a ,  16   b ,  16   c , and  16   d  is balanced, and the airframe  11  floats above the running surface  1  without swiveling counterclockwise or clockwise. In this case, in the transmitter  30  in which the power switch  36  is turned on, as shown in  FIG. 10 , the right and left operation levers  37  and  38  of the operating section  33  have perpendicular states without being operated with the fingertips.  
      Next, to move forwards the floated radio control flying toy  10 , as shown in  FIG. 11 , when the right and left operation levers  37  and  38  are simultaneously rotated toward an antenna  35  side (upwards) in the operating section  33  of the transmitter  30 , the signal generation circuit  34  generates a signal to raise the driving outputs of the third and fourth driving means  17   c  and  17   d  from 60% to 100%, and the signal is transmitted from the transmission circuit  31  to the antenna  35 . This forward moving signal is received by the receiving circuit  23  via the antenna  22  of the control unit  20 , and further transmitted from the control circuit  24  to the driving circuit  25 . The driving outputs of the corresponding third and fourth driving means  17   c  and  17   d  rise from 60% to 100%. The rises of the driving outputs of these third and fourth driving means  17   c  and  17   d  raise rotation speeds of the third and fourth propellers  16   c  and  16   d  disposed on the left and right sides. As shown in  FIG. 9 , a feed air amount on the rear side of the airframe  11  increases to move forwards the airframe  11 . In this case, even when the rotation speeds of the third and fourth propellers  16   c  and  16   d  on the rear left and right sides rise, the propellers rotate in the mutually opposite directions. Therefore, the force for reversing the airframe  11  is balanced, and the airframe  11  can be moved forwards without swiveling counterclockwise or clockwise.  
      Next, to move backwards the floated radio control flying toy  10 , as shown in  FIG. 12 , when the right and left operation levers  37  and  38  are simultaneously rotated on a side opposite to the antenna  35  (downwards) in the operating section  33  of the transmitter  30 , the signal generation circuit  34  generates a signal to raise the driving outputs of the first and second driving means  17   a  and  17   b  as described above from 60% to 100% as described above. On receiving this signal, the driving circuit  25  of the control unit  20  raise the driving outputs of the first and second driving means  17   a  and  17   b , and the rotation speeds of the first and second propellers  16   a  and  16   b  disposed on front left and right sides rise. As shown in  FIG. 12 , when the feed air amount increases on the front left and right sides of the airframe  11 , the airframe  11  moves backwards. In this case, even when the rotation speeds of the first and second propellers  16   a  and  16   b  rise in the same manner as in the forward movement, the propellers rotate in the mutually opposite directions. Therefore, the force for reversing the airframe  11  is balanced, and the airframe  11  can be moved backwards without swiveling counterclockwise or clockwise.  
      Next, to swivel clockwise the floated radio control flying toy  10 , as shown in  FIG. 13 , when the right operation lever  37  is rotated downwards with the fingertip, and the left operation lever  38  is rotated upwards with the fingertip in the operating section  33  of the transmitter  30 , the rotation speeds of the front right second propeller  16   b  and the rear left third propeller  16   c  rise in accordance with the rises of the driving outputs of the second and third second driving means  17   b  and  17   c  corresponding to the respective levers. Since these second and third propellers  16   b  and  16   c  rotate in the same counterclockwise direction as shown in  FIG. 2 , the rises of the rotation speeds generate a force for swiveling clockwise the airframe  11 . Therefore, the floated airframe  11  can be swiveled clockwise by performing the lever operation shown in  FIG. 13 . It is to be noted that it has been confirmed that the increase of the feed air amount accompanying the rises of the rotation speeds of the second and third propellers  16   b  and  16   c  generates a mutually canceling force, and does not largely influence a clockwise swiveling operation.  
      Next, to swivel counterclockwise the floated radio control flying toy  10 , as shown in  FIG. 14 , when the right operation lever  37  is rotated upwards with the fingertip, and the left operation lever  38  is rotated downwards with the fingertip in the operating section  33  of the transmitter  30 , the rotation speeds of the rear right fourth propeller  16   d  and the rear left first propeller  16   a  rise in accordance with the rises of the driving outputs of the fourth and first driving means  17   d  and  17   a  corresponding to the respective levers. Since these fourth and first propellers  16   d  and  16   a  rotate clockwise in the same direction as shown in  FIG. 2 , the rises of the rotation speeds generate a force for swiveling counterclockwise the airframe  11 . Therefore, the floated radio control flying toy  10  can be swiveled counterclockwise by means of the lever operation shown in  FIG. 14 . It is to be noted that it has been confirmed that the increase of the feed air amount accompanying the rises of the rotation speeds of the fourth and first propellers  16   d  and  16   a  does not largely influence a counterclockwise swiveling operation in the same manner as in the clockwise swiveling.  
      As described above, in the radio control flying toy  10  of the first embodiment of the present invention, information first to fourth propellers  16   a ,  16   b ,  16   c , and  16   d  disposed in four corners on the lower side of the airframe  11  to feed the air downwards to the running surface  1  side are driven by the first to fourth driving means  17   a ,  17   b ,  17   c , and  17   d , respectively. A pair of first and fourth propellers  16   a  and  16   d  positioned along one diagonal line to form the quadrangular shape of four corners, and the second and third propellers  16   b  and  16   c  positioned along the other diagonal line are rotated in the opposite directions. Based on the signal transmitted from the transmitter  30 , the control unit  20  controls the driving outputs of the first to fourth driving means  17   a ,  17   b ,  17   c , and  17   d , respectively. Moreover, to float the airframe, the first to fourth propellers  16   a ,  16   b ,  16   c , and  16   d  are rotated at the equal low speed of about 60%. To move the airframe forwards, the rotation speeds of the third and fourth propellers  16   c  and  16   d  on the rear left and right sides are raised. To move the airframe backwards, the rotation speeds of the first and second propellers  16   a  and  16   b  on the front left and right sides are raised. To swivel the airframe clockwise, the rotation speeds of the second and third propellers  16   b  and  16   c  are raised. To swivel the airframe counterclockwise, the rotation speeds of the first and fourth propellers  16   a  and  16   d  are raised. Therefore, in the radio control flying toy  10  of the present embodiment, a structure is simplified, a large driving power supply is not required for driving the blower for floating or propelling unlike a conventional air cushion toy, power consumption can be reduced, long-time flight is possible, and the toy can be enjoyed by floating and freely flying the toy above the flat running surface  1 .  
      In the radio control flying toy  10  of the first embodiment, there has been described the example in which the pair of first and fourth propellers  16   a  and  16   d  positioned along one diagonal line are rotated clockwise, and the pair of the second and third propellers  16   b  and  16   c  positioned on the other diagonal line are rotated counterclockwise. However, one pair may be rotated counterclockwise whereas the other pair may be rotated clockwise. In this case, the advancing and backing lever operations are the same, but the clockwise and counterclockwise swiveling operations are reversed. The driving outputs of the first to fourth driving means  17   a ,  17   b ,  17   c , and  17   d  are raised from 60% to 100% in accordance with the lever operation of the transmitter  30 . However, conversely, even when the driving outputs are lowered from 100% to 60%, the running can be controlled. In this case, the running operation by the same lever operation differs. Furthermore, when only one of the right and left operation levers  37  and  38  are rotated, the swiveling operation can be performed.  
       FIGS. 15 and 16  are explanatory views of a constitution of a radio control flying toy in a second embodiment of the present invention.  FIG. 15  is a perspective view of the radio control flying toy, and  FIG. 16  is a plan view of the radio control flying toy. It is to be noted that components and members corresponding to those of the first embodiment are denoted with the same reference numerals, and detailed description thereof is omitted.  
      In the second embodiment of the present invention, a radio control flying toy  40  is provided with: first to fourth propellers  16   a ,  16   b ,  16   c , and  16   d  which are disposed in four corners forming a quadrangular shape of a lower main body  13  on a lower side of an airframe  11 , respectively; first to fourth driving means  17   a ,  17   b ,  17   c , and  17   d  which drive the first to fourth propellers  16   a ,  16   b ,  16   c , and  16   d , respectively; a control unit  20  which individually controls driving outputs of the first to fourth driving means  17   a ,  17   b ,  17   c , and  17   d , respectively; a battery  21  which supplies power to the first to fourth driving means  17   a ,  17   b ,  17   c , and  17   d  and the control unit  20 ; a transmitter  50  for transmitting a control signal for flight by a button operation from the outside to the control unit  20  and the like in the same manner as in the first embodiment. Unlike the first embodiment, in the radio control flying toy  40 , the first and third propellers  16   a  and  16   c  on the left side are rotated in the same counterclockwise direction, and the second and fourth propeller  16   b  and  16   d  on the right side are rotated in the same clockwise direction. As shown in  FIG. 15 , the transmitter  50  has a case section provided with an antenna  35  for transmission and manually held to operate, and the operating section  33  is provided with four operation buttons  51 ,  52 ,  53 , and  54  which are to be operated horizontally and vertically with fingertips. These operation buttons  51 ,  52 ,  53 , and  54  are individually pressed, respectively, to transmit a signal to raise the driving outputs of the corresponding first to fourth driving means  17   a ,  17   b ,  17   c , and  17   d  from usual 60% to about 100%, and another circuit constitution is similar to that of the transmitter  30  of the first embodiment.  
      Next, an operation of the radio control flying toy  40  constituted as described above will be described. FIGS.  17  to  21  are explanatory views of the operation of the radio control flying toy in the second embodiment.  FIG. 17  is an explanatory view of an operation of a transmitter at a time when the radio control flying toy floats;  FIG. 18  is an explanatory view of an operation of the transmitter at a time when the radio control flying toy moves forwards;  FIG. 19  is an explanatory view of an operation of the transmitter at a time when the radio control flying toy moves backwards;  FIG. 20  is an explanatory view of an operation of the transmitter at a time when the radio control flying toy swivels clockwise; and  FIG. 21  is an explanatory view of an operation of the transmitter at a time when the radio control flying toy swivels counterclockwise.  
      First, to operate the radio control flying toy  40 , when a power switch  19  is turned on, all of the first to fourth driving means  17   a ,  17   b ,  17   c , and  17   d  are driven with the equal driving output of 60%, all of the first to fourth propellers  16   a ,  16   b ,  16   c , and  16   d  are rotated at an equal speed, a space is generated in which air flows between the bottom surface  14  and a running surface  1 , and the airframe  11  floats above the running surface  1  in a stopped state in the same manner as in the first embodiment. In this case, the first and third propellers  16   a  and  16   c  on the left side are rotated counterclockwise, and the second and fourth propeller  16   b  and  16   d  are rotated clockwise. Therefore, a force for reversing the airframe  11  is balanced, and the airframe  11  floats on the spot without swiveling counterclockwise or clockwise. In this case, in the transmitter  50 , as shown in  FIG. 17 , any of the operation buttons  51 ,  52 ,  53 , and  54  of the operating section  33  are not operated (not pressed).  
      Next, to move forwards the floated radio control flying toy  40 , as shown in  FIG. 18 , the operation buttons  53  and  54  on a lower side are simultaneously operated with fingertips in the operating section  33  of the transmitter  50  (in  FIG. 18 , buttons to be operated are shown by arrows. This also applies to the following description of the button operation with reference to the drawings). When the buttons are operated in this manner, the driving outputs of the corresponding third and fourth driving means  17   c  and  17   d  rise from 60% to 100%, rotation speeds of the second and fourth propeller  16   b  and  16   d  disposed on rear left and right sides rise, and the airframe  11  moves forwards in the same manner as in the first embodiment. In this case, even when the rotation speeds of the third and fourth propellers  16   c  and  16   d  on the rear left and right sides rise, the propellers rotate in the mutually opposite directions. Therefore, the force for reversing the airframe  11  is balanced, and the airframe  11  can be moved forwards without swiveling counterclockwise or clockwise.  
      Next, to move backwards the floated radio control flying toy  40 , as shown in  FIG. 19 , the upper operation buttons  51  and  52  are simultaneously operated in the operating section  33  of the transmitter  50 . When the buttons are operated in this manner, the driving outputs of the corresponding first and second driving means  17   a  and  17   b  rise from 60% to 100%, the rotation speeds of the first and second propellers  16   a  and  16   b  disposed on front left and right sides rise, and the airframe  11  moves backwards in the same manner as in the first embodiment. In this case, even when the rotation speeds of the first and second propellers  16   a  and  16   b  on the front left and right sides rise, the propellers rotate in the mutually opposite directions. Therefore, the force for reversing the airframe  11  is balanced, and the airframe  11  can be moved backwards without swiveling.  
      Next, to swivel clockwise the floated radio control flying toy  40 , as shown in  FIG. 20 , both or one of the left operation buttons  51  and  53 , for example, the lower operation button  53  is operated with the fingertip in the operating section  33  of the transmitter  50 . When the button is operated in this manner, the driving output of the corresponding third driving means  17   c  rises from 60% to 100%, and the rotation speed of the third propeller  16   c  rises. This rise of the rotation speed of the third propeller  16   c  generates a force to swivel the third propeller  16   c  in a clockwise direction opposite to the counterclockwise rotating direction in the airframe  11 . Therefore, as shown in  FIG. 20 , the floated radio control flying toy  40  can be swiveled clockwise by operating the button. In this case, since a force to move the airframe  11  is simultaneously added owing to the increase of the air feed amount accompanying the rise of the rotation speed of the third propeller  16   c , an operation different from that in clockwise swiveling of the first embodiment is performed. It is to be noted that in a case where both of the left operation buttons  51  and  53  are operated, the air feed amount increases accompanying the rises of the rotation speeds of the first and third propellers  16   a  and  16   c , and a clockwise swiveling operation is confirmed after the airframe  11  moves rightwards.  
      Next, to swivel the floated radio control flying toy  40  counterclockwise, as shown in  FIG. 21 , both or one of the right operation buttons  52  and  54 , for example, the lower operation button  54  is operated with the fingertip in the operating section  33  of the transmitter  50 . When the button is operated in this manner, the driving output of the corresponding fourth driving means  17   d  rises from 60% to 100%, and the rotation speed of the third propeller  16   d  rises. This rise of the rotation speed of the fourth propeller  16   d  generates a force to swivel the fourth propeller  16   d  in a counterclockwise direction opposite to the clockwise rotating direction in the airframe  11 . Therefore, as shown in  FIG. 21 , the floated radio control flying toy  40  can be swiveled counterclockwise by operating the button. In this case, since a force to move the airframe  11  is simultaneously added owing to the increase of the air feed amount accompanying the rise of the rotation speed of the fourth propeller  16   d , an operation different from that in the counterclockwise swiveling of the first embodiment is performed. It is to be noted that in a case where both of the right operation buttons  52  and  54  are operated, the air feed amount increases accompanying the rises of the rotation speeds of the right second and fourth propeller  16   b  and  16   d , and a counterclockwise swiveling operation is confirmed after the airframe  11  moves leftwards.  
      As described above, in the radio control flying toy  40  of the second embodiment of the present invention, the first to fourth propellers  16   a ,  16   b ,  16   c , and  16   d  to be driven by the first to fourth driving means  17   a ,  17   b ,  17   c , and  17   d  are disposed in four corners on the lower side of the airframe  11  in the same manner as in the first embodiment. Moreover, the transmitter  50  raises the driving outputs of the first to fourth driving means  17   a ,  17   b ,  17   c , and  17   d  corresponding to the four operation buttons  51 ,  52 ,  53 , and  54  from usual 60% to about 100%. Therefore, when the driving outputs of the first to fourth driving means  17   a ,  17   b ,  17   c , and  17   d  are individually changed by the operation buttons  51 ,  52 ,  53 , and  54 , the forward moving, backward moving, and counterclockwise and clockwise swiveling can be performed. The toy can be floated above the flat running surface  1 , freely flied, and enjoyed in the same manner as in the first embodiment.  
      In the radio control flying toy  40  of the second embodiment, there has been described the example in which the left first and third propellers  16   a  and  16   c  are rotated in the same counterclockwise direction, and the right second and fourth propeller  16   b  and  16   d  are rotated in the same clockwise direction. However, the left propellers may be rotated in the same clockwise direction whereas the right propellers may be rotated in the same counterclockwise direction. In this case, the button operations for the forward and backward movements are the same, but the clockwise swiveling operation is opposite to the counterclockwise swiveling operation. The driving outputs of the first to fourth driving means  17   a ,  17   b ,  17   c , and  17   d  are raised from 60% to 100% in accordance with the lever operation of the transmitter  30 , but the driving outputs may be conversely lowered from 100% to 60%. In this case, the running operation by the same lever operation differs.  
      It is to be noted that in the first and second embodiments, the airframe  11  may be formed into an arbitrary shape as long as the airframe has the flat bottom surface  14  parallel to the running surface  1  on the lower side, and is entirely formed into the rectangular plate shape, and the first to fourth propellers  16   a ,  16   b ,  16   c , and  16   d  are disposed in four corners forming quadrangular shape, respectively. Moreover, the operation levers  37 ,  38  of the transmitter  30  of the first embodiment, and the operation buttons  51 ,  52 ,  53 , and  54  of the transmitter  50  of the second embodiment may be constituted so as to be operated to thereby raise or lower the driving outputs of the corresponding first to fourth driving means  17   a ,  17   b ,  17   c , and  17   d , respectively. Furthermore, the radio control flying toy  10  of the first embodiment can be operated with the transmitter  50  in the same manner as in the second embodiment, and the radio control flying toy  40  of the second embodiment can be operated with the transmitter  30  in the same manner as in the first embodiment.  
      The present invention is applicable to a radio control flying toy in which air is fed toward a bottom-surface side of an airframe so that the airframe can be floated above a flat running surface, and freely flied.