Abstract:
The invention is a projectile plaything, namely a boomerang-like toy that, if properly thrown, will fly in an arcuate path and return to the area of its release. The plaything will be formed to imitate the shape of the United States Air Force B2 Bomber, aka the Stealth Bomber.

Description:
FIELD OF THE INVENTION 
   The invention is a boomerang-like airfoil toy bearing specific appearance and attributes of the Stealth or B-2 Bomber, making the toy more attractive than a standard boomerang toy. Hence the name hereinafter used, bomberang. 
   BACKGROUND OF THE INVENTION 
   The toy has several distinctive features and attributes, including but not limited to:
         a. its operation as a boomerang, i.e., when properly thrown the toy will return to the general area from which it was thrown, due to the shape of the airfoil from which it is constructed;   b. The physical appearance of the device is similar to an existing military aircraft within the arsenal of the United States Air Force. Specifically, the outline of the toy is similar to the B2 bomber, or the Stealth Bomber [hereinafter, B2].       

   The bomberang is constructed as a single, unitary airfoil having the basic outline shape as a modified isosceles triangle. The angle subtended by the equal-length sides of the isosceles triangle serves as the front or “nose” of the device. Preferably, this angle is formed to be approximately 90-100 degrees. The equal length sides of the isosceles triangle are generally straight. In appearance, these equal length sides form the wing-like airfoils, and in appearance serve as the leading edges of the wings of the B2. The construction of the device is such that the unit itself does not appear to include a combination of wings and separate fuselage, but the entire device approximates a lifting body and appears similar to a delta wing type structure. The aforementioned wings project slightly beyond the third side of the device&#39;s triangular shape, and are squared off at their respective termination points, to more closely resemble the wing shape of the B2, yet still serving as the airfoils for the device. 
   The third side of the generally triangular shaped device connects to the previously noted wings, forming nominal 40-45 degree angles with the leading edges of the wings. This third side is cut on its trailing surface in a sawtooth pattern and forms, in appearance, the edge of the lifting body. This sawtooth pattern consists of three teeth, and is intended to generally resemble the appearance of the trailing edge of the lifting body that forms the B2 of the United States Air Force. This is, as noted, the trailing edge in appearance only since individual edges along the sawtooth pattern include both leading and trailing edges of the boomerang itself. 
   An opening is cut from the central portion of the device, specifically, the central portion of the delta wing/triangular shape of the unit. This cutout allows the airfoil, as required, to maintain the operation of the unit as a boomerang, while still retaining in general, the shape of the B2. The shape of the removed portion follows in generally the edges of the nominally triangular shape of the entire device, allowing the maintained width of the remaining material in the device to act as an airfoil. When constructed of heavier materials, the failure to remove the cutout portion results in the width of the body of the device being too heavy to function as an airfoil type device. The removal of this central portion of the original triangular shape allows device to approximate the airfoil nature and similar function to that of a standard boomerang, while maintaining leading and trailing edges and adequate structure that retains the appearance of the B2. 
   The main body of the toy is formed from a single thin piece of material, initially the shape of an isosceles right triangle. Indeed, the legs of the isosceles form an angle that is preferably 90-100 degrees, and the vertex of this angle formed by the legs will comprise the front or “nose” of the device and therefore mimics the nose of the B2. The wings continue rearward from the nose, and are squared off at their respective termination points, and form a line generally parallel to the leading edge of the opposite wing. The rear of the invention at the outside edges is formed by the two wings, each of which form a trailing edge of the wing on either side of the device. 
   The appearance of the device is such that the trailing edge of each of the wings is constructed nominally parallel to the leading edge of the respective opposite wing. Additionally, each wing then extends toward the front of the device, approximately one-third (⅓) of the distance from the front to the back of the respective wing. The jagged sawtooth pattern is preferably made up of three regular serrations centered between the trailing edges of the opposite wings. 
   SUMMARY OF THE INVENTION 
   The invention is a projectile plaything that preferably returns to the general location from which it is thrown, similar in function to that of a standard boomerang. The plaything includes a top face and an opposite facing bottom face. A nose point is formed at respective initial points of a first edge and a second edge, which bear generally equal lengths. 
   The third edge of the plaything has a generally jagged sawtooth pattern and connects terminal points of the first and second edges. More particularly, the sawtooth pattern includes first short edge that extends from the terminal point of the first edge in a direction generally parallel to the second edge. A first parallel edge extends from the first short edge and runs generally parallel to the first edge. 
   The third edge, namely the jagged-sawtooth edge, also includes a second short edge extending from a terminal point of the second edge. This second short edge extends in a direction generally parallel to the first edge. A second parallel edge extends from the second short edge and running generally parallel to the second edge. 
   Each of the first and second parallel edges cooperate to form a wing-like protrusion from the body of the toy, similar in appearance to the main wings of the B2 and useful in this device as a handle for throwing/launching the device. 
   In order to create the proper aerodynamics when the plaything is rotationally thrown, the respective first and second parallel edges are each tapered. 
   The sawtooth pattern of the third edge also bears a plurality of V-Shaped projections, preferably three V-Shaped projections, which more accurately mirrors the shape and design of the B2. Each V-Shape has a vertex that points away from the nose point. 
   The first edge of the plaything bears a leading chamfer formed along the first edge and angling from the top face toward the bottom face. This leading chamfer starts at a point between ends of the first edge. The leading chamfer linearly broadens from the stating point of the leading chamfer. 
   The second edge of the plaything bears a trailing taper that is formed along the second edge and starts from the nose point and linearly broadening distal the nose point. 
   The plaything also bears a cut-out portion between the nose point and the sawtooth pattern. Preferably, edges of the cut-out portion bears a chamfer generally forming a continuation of the taper on the second edge. 
   The trailing taper formed on the second edge may actually start from the nose point, broaden linearly along the entire length of the second edge, and terminate adjacent the second short edge. In contrast, the leading chamfer may start at a point on the first edge that is generally equidistant the length of the first parallel edge. 
   The sawtooth pattern may have a first, a middle, and a third V-Shaped projection, such that the outline of the plaything is generally symmetric about a line passing through the nose and a vertex of the middle V-Shaped projection. In order to create the proper airfoil effect, the first, and third V-Shaped projections may each bear a leading edge that is generally parallel to the second edge of the plaything and a trailing edge that is generally parallel to the first edge of the plaything; and, the trailing edge of each of the first and third V-Shaped projection bears a taper. 

   
     BRIEF DESCRIPTION OF THE DRAWINGS 
       FIG. 1  is a perpective view of the projectile plaything, according to the principles of the invention. 
       FIG. 2  is a plan view, from above, of the projectile plaything. 
       FIG. 3  is an underside view of the projectile plaything. 
       FIG. 4  shows a cross-sectional view, at plane IV shown in FIG.  1 . 
       FIG. 5  is a diagram showing a preferred use of the projectile plaything. 
   

   DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     FIG. 1  shows a perspective view, as seen from above and behind, of the projectile plaything (hereinafter, bomberang). The Bomberang has a first edge  14  and a second edge  16  that come together at nose  12  to form a nominal right angle. Indeed, the preferred angle for the nose  12  is between 90 and 100 degrees. The first edge  14  bears a leading chamfer  18  that originates at a point intermediate the nose and the first short edge  20 . Indeed, it is preferred that the leading chamfer  18  begin at a point about ⅔ of the way from the nose  12  to the terminus of the first edge  14 . This chamfer on the leading edge is constructed with a radius and terminated on the bottom side of the device. 
   As seen in  FIG. 1 , the first short edge  20  extends from the terminus of the first edge  14 ; the first short edge  20  extends generally parallel to the second edge  16 . A first parallel edge  19  extends from the first short edge  20  and runs generally parallel to the first edge  14 . 
   Still referring to  FIG. 1 , the first edge  14  and second edge  16  generally form the legs of an isosceles right triangle having nose  12  as the right angle. The third edge  40  of the right-angle triangle bears a general sawtooth-like pattern having V-shaped projections  24 ,  26  and  28  that point in a direction opposite the nose  12 . 
   As further seen in  FIG. 1 , a cut-out portion  30  is positioned between the nose  12  and the third edge  40 . Edges of the cut-out portion  30  bear a tapered edge  32 , which assists in creating the airfoil effect when the bomberang  10  is thrown so that it rotates about an axis generally perpendicular to the bomberang  10 . 
     FIG. 2  shows an overhead view of the top face  13  of the bomberang  10 . The first edge  14  bears a leading chamfer  13 . As shown, the leading chamfer  18  extends from an initial point, which is positioned between the ends ( 12 ,  20 ) of the first edge  14 , to a terminating point that is along first short edge  20 . Note that the leading chamfer  18  and the taper  22  along the first parallel edge  19  may intersect at a point on the top face  13  and near the first short edge  20 . 
   Still, referring to  FIG. 2 , the first edge  14 , first short edge  20 , and parallel edge  19  also cooperate to form a first wing-like structure  44  that may serve as a handle when the bomberang is thrown. Either wing may serve as the noted handle in that the direction of rotation will remain the same presuming the device is oriented the same for either method (see FIG.  5 ). 
   The second edge  16  bears a long taper  17  that begins at the nose  12  and broadens linearly along the second edge  16  until it reaches its terminus at the second short edge  21 . Note that the second edge  16 , the second short edge  21 , and the second parallel edge  23  cooperate to form a second wing-like structure  46  that also may serve as an alternate handle when the bomberang is thrown (as shown in FIG.  5 ). 
   As shown in  FIG. 2 , the Bomberang  10  is constructed so that its center of mass, and its angle of rotation, is likely located within the cut-out portion  30  of the bomberang  10 . Preferably, the bomberang should be thrown so that it rotates in the direction R about its centroid, so that the enlarged portion of each structure initially slices the air, and the tapered portion(s) follow. For example, an enlarged portion of first edge  14  first engages the air as the bomberang is thrown and as the bomberang  10  rotates, the tapered, thinner, taper  22  of the first parallel edge  19  follows. 
   Still referring to  FIG. 2 , as the bomberang  10  continues to rotate in direction R (in  FIG. 2 , a general clockwise rotation), the second generally-parallel edge  23  will contact still air before the trailing chamfer  17  of second edge  16 , so that the enlarged end of this wing-like structure first contacts the air, and the tapered end  17  follows. 
   Also, as shown in  FIG. 2 , the cut-out portion  30  also bears a tapered edge  32 . The tapered edge  32  should be formed so that, as the bomberang  10  rotates in direction R, an enlarged end first contacts air, and is followed by a thinner, tapered end. This cutout area serves as a continuation of the taper of the wing-like structure  44 . 
     FIG. 2  also gives a detailed view of the third side  40 , which bears a general sawtooth like configuration. Three V-Shaped projections  24 ,  26 ,  28  are symmetrically positioned between first short edge  20  and second short edge  21 . Each of these projections  24 ,  26 , and  28  has respective vertex that points away from, and opposite to, nose  12 . The overall effect of the orientation of the nose  12  and the projections  24 ,  26 ,  28  is to uniquely imitate the shape of the B2 Bomber. The first projection  24  and the third projection  28  are configured so that, as the bomberang  10  rotates in direction R, an enlared end of the first projection  24  and third projection  28  contact still air before the trailing portion of the respective projection  24 ,  28 . Both edges of V-shaped projection  26 , however, are neutrally formed. 
   With specific reference to  FIG. 2 , as the bomberang  10  rotates in direction R, the first edge  14  will contact still air; next, the leading edge  34  of first projection  24  will contact the still air; next, the leading edge  36  of the middle projection  26  will contact the still air; next, the leading edge  38  of the final V-Shaped projection  28  will contact still air; and finally, the second parallel edge  23  will slice the still air. 
     FIG. 3  shows a bottom view of the bomberang  10 . The bomberang has a generally-planar bottom face  15 . The fist edge  14  and the second edge  16  meet at the nose point  12 , which approximates a right angle. The third edge  40  includes a general sawtooth pattern having three V-Shaped projections  24 ,  26 ,  28  that point away from the nose  12 . 
   Still referring to  FIG. 3 , it is apparent that the V-Shaped projections  24  and  28  bear tapers that terminate with the bottom face  15 ; thus, the tapers on these projections  24 ,  28  are not viewable from the bottom view. However, note that the middle V-Shaped projection  26  has tapers that are visible from the bottom view. In this preferred embodiment shown in  FIG. 3 , the middle V-Shaped projection  26  contains “neutral” tapes on both its trailing edge  37  and the leading edge  36 . 
   As seen in  FIG. 3 , the direction of rotation R is counter-clockwise with respect to bottom face  15 . The first edge  14  is the first to contact still air when the bomberang  10  rotates in direction R, and first edge  14  is then followed by the leading edge  34  of the first V-Shaped projection  24 . The next leading edge to cut the still air will be the leading edge  36  of the middle V-Shaped protrusion  26 ; after that, the next leading edge to cut still air would be the leading edge  38  of the third V-Shaped protrusion  28 , and finally, the second short parallel edge  23  will cut the air. The trailing edges—namely, first parallel edge  19 , trailing edge  35 , trailing edge  37 , trailing edge  39 , and second edge  16 —should all be tapered to provide airfoil effect. 
   As seen in  FIG. 3 , the first edge  14  and the first short edge  20  and the first parallel edge  19  cooperate to form a winglike structure  44  that can be used as a handle to throw the bomberang  10 . Analogously, the second edge  16 , the second short edge  21 , and the second parallel edge  23  cooperate to form a winglike structure  46  that can be used as an alternate handle to throw the bomberang  10 . 
     FIG. 4  shows a perspective view of a cross-section of the wing-like structure  44 , taken at a plane as shown in FIG.  1 .  FIG. 4  shows shape of the first edge  14 , which has a leading chamfer  18  on a bulbous edge that faces directly into the airflow A. The first edge  14  first contacts the airflow A, then the taper  22  of the first parallel edge  19  passes through the same airflow A. As the enlarged portion of the first edge  14  pushes through airflow A, causing a change of linear fluid momentum. This change in linear fluid momentum creates a lower pressure center on the top face  13  of the wing, and therefore a resulting force that propels the bomberang in the direction U. An equal and opposite propulsion occurs at the opposite winglike structure  46  (as seen in FIG.  1 - 3 ), which in turn causes to propel the bomberang  10  in a large arcuate path resulting in a flight termination location within the same general area as its origination. 
     FIG. 5  shows the bomberang  10  as it would be thrown, shown with a view toward the bottom face  15  so that the direction of rotation R is counter-clockwise. The nose  12  rotates downwardly after this release, and then first edge  14  cuts through the still air, followed by the third edge  40  (bearing sawtooth pattern), and the rotation is completed as second edge  16  follows closely behind. 
   Having described the invention in detail, the descriptions hereinabove should be considered for illustration only and not for limitation purposes. The scope of the invention shall be limited only by the appended claims. 
   Having described and illustrated the invention in detail, it is to be understood that the above and foregoing is for illustration and demonstration only. The descriptions herein are not intended to limit the breadth of this invention. The breadth of this invention is limited only by the appended claims.