Abstract:
The invention includes a two-piece adjustable camber wing-shaped inflatable sail for use as a main and or misin sail and a two-piece adjustable camber wing-shaped inflatable sail for use as a head sail, by contemporary sailing vessels with conventional sail rigs having a mast, boom, headstay, backstay, and sidestays. The main sail features a leading edge and physically separate main body, each having two inflatable cells; one port and starboard, enclosed in an outer cover. The main body will attach to the mast in a conventional manner. The leading edge of the main sail will attach to the front and side portions of the mast and feature two inflatable cell pockets; port and starboard, which to insert independent port and starboard semi-wedge shaped inflatable cells. The leading edge of the main sail will extend from just above the deck to the masthead. The leading edge of the head sail will attach to the headstay and feature two inflatable cell pockets; port and starboard, which to insert independent port and starboard semi-wedge shaped inflatable cells or a solid non-inflatable lightweight core. It will extend from just above the foredeck to the masthead. The main body portions of the main sail and headsail will each feature a center panel, two forward panels, two outer panels, bottom panel, and a plurality of horizontally positioned shaping panels that together form a two-chamber inflatable cell. The inflatable cells can be inflated or deflated independently to adjust the shape of the adjustable camber wing-shaped inflatable sails.

Description:
BACKGROUND OF THE INVENTION--PRIOR ART 
     A majority of the design changes used to improve the performance of sailing vessels has been below the water line particularly in the design of the hull and keel, or the use of lighter weight materials. However little, if any improvements have been made to the sails that is used to power sailing vessels. The design of the sails used to power ancient sail vessels are very similar to the sails used to power contemporary sailing vessels. The principles that define the performance characteristics of a sail used to power a sailing vessel are similar as the principles that define the performance characteristics of a wing used to power an aircraft. Therefore, the principles and experimentation used to design a wing used to power an aircraft can also be used to design a sail that can be used to power a sailing vessel. This invention allows the sailing vessel to benefit from the airfoil design technology used in aircraft wing design. The principles used to design the most efficient wing for use by an aircraft is used to design the most efficient wing shaped sail for use by a sailing vessel. The design of the invention (adjustable camber wing shaped sail) is based on the theories, principles, and experimentation used by the (NACA) National Advisory Committee for Aeronautics, United States to design and test airfoils, which are public domain. 
     The performance characteristics of a flat wing used to power an aircraft is substantially less efficient than the performance characteristics of a thicker asymmetrical wing in low-speed flight conditions. Therefore, it is logical to conclude that a thicker sail would be more efficient than a flat sail. The primary problem of past wing shaped sail designs have been that the benefits gained by the superior design (more efficient airfoil shape) was outweighed by the increased weight of a fixed wing structure using rigid materials can withstand the loads. In order for a wing-shaped sail to provide superior performance characteristics compared to that of conventional flat sail, the weight of the wing-shaped sail must be reduced. Several improved sail designs have been proposed including rigid, ribbed and inflatable sails. To date, none of these sail designs have been proven to provided sailing characteristics considered sufficiently superior to that of a conventional flat sail to be marketed and used on contemporary sailing vessels. This invention (adjustable camber wing-shaped sail) will prove to provide superior sailing performance including greater lift and ability to point higher than sailing vessels using conventional sails. 
     This invention (adjustable camber wing-shaped sail) has the lift characteristics similar to the lift characteristics of a fixed wing sail, but is substantially lighter than current fixed, ribbed, or inflatable designs. Unlike fixed wing designs, the shape of the invention (adjustable camber wing-shaped sail) sail is defined by inflatable cells that are substantially lighter than the aforementioned fixed wing sails that use ridged (metal, wood, or other similar material) to define the shape of the sail. The invention (adjustable camber wing-shaped sail) has been designed to allow it to be used on conventional sailing rigs without substantial modifications to the contemporary sailing vessel. 
     Unlike symmetrical ribbed or inflatable sail designs, the multi-cell design of this invention allows the shape of the sails to be adjusted to increase the lift characteristics of the sails on various points of sail. The superior sailing characteristics of the invention (adjustable camber wing-shaped sail) include greater lift, ability to sail (point) at a closer angle to the wind than vessels using conventional flat sails and ability for use by sailing vessels with conventional mast-boom sailing rig. These characteristics outweigh the increased weight compared to a conventional flat sail. The purpose of this invention is to provide a sail that has superior performance characteristics compared to contemporary flat sails, fixed airfoils, and symmetrical inflatable sail designs that can be used by conventional sailing vessel. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIG. 1 is a cut away isometric view of the main sail portion of the invention in a fully inflated state, attached to a mast. 
     FIG. 2 is a cross section view of the main sail portion of the invention in a fully inflated state as if the boat was on a starboard tach with a wind angle of 0 degrees, attached to a mast. 
     FIG. 3 is a cross section view of the main sail portion of the invention in a fully inflated state as if the boat was on a starboard tach on a beam reach point of sail, attached to a mast. 
     FIG. 4 is an aerial view (viewing down from the masthead to the deck of the boat) of the main sail portion of the invention in a fully inflated state as if the boat was on a starboard tach, attached to a mast. 
     FIG. 5 is a cross section view of mast and leading edge portion of the main sail, attached to a mast. 
     FIG. 6 is an isometric view of the inflatable cell used in the leading edge portion of the main sail. 
     FIG. 7 is an isometric view of the bottom wall of the main sail (leading edge and main body). The figure shows the inflation hoses attached to the main connecting valves. 
     FIG. 8 is an isometric view of a small section of the inflating/deflating tube, which is contained in the inflatable cells. 
     FIG. 9 is an isometric view of the main body portion of the main sail in a fully inflated state, attached to a conventional mast. 
     FIG. 10 is a close-up isometric view of a portion of the main body portion of the main sail. 
     FIG. 11 is an isometric view of the main body portion of the main sail in a fully inflated state. 
     FIG. 12 is an isometric view of the port side inflatable cell used in the main body portion of the main sail (starboard inflatable cell will be a mirror image). 
     FIG. 13 is a cut away isometric view of the head sail portion of the invention attached to a headstay and mast. 
     FIG. 14 is a side view of the head sail portion of the invention attached to a headstay and mast. 
     FIG. 15 is a cross section view of the headsail portion of the invention in a fully inflated state, on starboard tach. 
     FIG. 16 is a cross section view of the main body portion of the headsail in a fully inflated state. 
     FIG. 17 is an isometric view of the main body portion of the headsail in a fully inflated state. 
     FIG. 18 is an isometric view of the leading edge cone portion of the headsail. 
     FIG. 19 is a cross section view of the leading edge cone portion of the headsail. 
     FIG. 20 is an isometric view of the bottom wall of the headsail (leading edge cone and main body). The figure shows the inflation hoses attached to the main connecting valves. 
    
    
     REFERENCE NUMERALS IN DRAWINGS 
     1 Mast 
     2 Boom 
     3 Main Body Sail 
     4 Center Panel 
     5 Main Halyard 
     6 Head Grommet 
     7 Tack Grommet 
     8 Clew Grommet 
     9 Port side Inflatable Cell--Main Sail 
     10 Starboard side Inflatable Cell-Main Sail 
     11 Shaping Panels 
     12 Outer Cover 
     13 Leading Edge Portion 
     14 Inner Wall 
     15 Port Inflatable Cell-Leading Edge 
     16 Starboard Inflatable Cell-Leading Edge 
     17 Leading Edge Outer Cover 
     18 Leading Edge Rear Wall 
     19 Leading Edge Cell Shaping Panels 
     20 Leading Edge Cell Pass-through Holes 
     21 Leading Edge-Inflating/deflating Tubes 
     22 Leading Edge Main Connecting Valves 
     23 Leading Edge Inflation Hose 
     24 Leading Edge Male/Female Couplings 
     25 Inflation/deflation Tube Opening Ports 
     26 Inflation/deflation Tube Rigid Shaping Rings 
     27 Inflation/deflation Tube Flexible Cover 
     28 Main Sail Inflatable Cell Forward Wall 
     29 Main Sail Inflatable Cell Outer Wall 
     30 Main Sail Attachment Points 
     31 Main Sail Inflatable Cell Bottom Wall 
     32 Main Sail Bottom Connecting Valves 
     33 Main Sail First Reef Point Connecting Valves 
     34 Main Sail Second Reef Point Connecting Valves 
     35 Main Sail First Reef Point Grommets 
     36 Main Sail Second Reef Point Grommets 
     37 Main Sail Inflation Hoses 
     38 Inflatable Cell Pass-through Holes 
     39 Main Sail Shifting Slots 
     40 Main Body Sail-Inflating/deflating Tubes 
     50 Headstay 
     51 Leading Edge Cone portion of the Head Sail 
     52 Main Body portion of the Head Sail 
     53 Main Body Inflatable Cell Center Panel 
     54 Head Sail Halyard 
     55 Head Sail Head Grommet 
     56 Head Sail Tack Grommet 
     57 Head Sail Clew Grommet 
     58 Head Sail Outer Panel 
     59 Head Sail Forward Panel 
     60 Inflatable Cell Pass-through Holes 
     61 Head Sail Headstay Attachments 
     62 Head Sail Port side Inflation/deflation Tubes 
     63 Head Sail Starboard side Inflation/deflation Tubes 
     64 Head Sail Port side Inflatable Cell 
     65 Head Sail Starboard side Inflatable Cell 
     66 Head Sail Outer Cover 
     67 Head Sail Main Connecting Valves 
     68 Head Sail Inflatable Cell Shaping Panels 
     69 Head Sail Shifting Slots 
     70 Head Sail Main Body Inflation Hoses 
     71 Male/Female Locking Couplings 
     72 Head Sail Leading Edge Core 
     73 Head Sail Leading Edge Outer Cover 
     74 Head Sail Leading Edge Headstay tube 
     75 Head Sail Leading Edge Connecting Valves 
     76 Head Sail Leading Edge Inflation Hoses 
     77 &#34;C&#34; Shaped Headstay Attachment Channel 
     78 Lower Swivel Plate 
     79 Head Sail Leading Edge Port Side Inflating Cell 
     80 Head Sail Leading Edge Starboard Side Inflating Cell 
     81 Head Sail Leading Edge Port Inflating/deflating Tube 
     82 Head Sail Leading Edge Starboard Inflating/deflating Tube 
     83 Head Sail Leading Edge Hinge Points 
     84 Upper Swivel Plate 
     85 Two-piece Velcro® System 
     86 Head Sail Leading Edge Bottom Walls 
     87 Head Sail Leading Edge Zipper 
     DETAILED DESCRIPTION OF THE INVENTION 
     FIG. 1 is a cut away isometric view of the main sail portion of the invention, the adjustable camber wing-shaped sail in a fully inflated state. This view shows the main body portion 3 and leading edge portion 13 attached to a conventional sailing rig of a typical sail boat that includes a fixed mast 1 and a boom 2. The main body portion 3 is attached to the mast 1 in a conventional manner that includes either: 1) a continuous cord incorporated into the luff portion of center panel 4 (refer to FIG. 2) of the main body portion 3 of the main sail that slides into a slot in the mast, or 2) several attachment points incorporated into the luff portion of the center panel 4 of the main body portion 3 of the main sail that attach to several cars (or slides) that move along the length of the mast 1. 
     The main body portion 3 of the main sail is raised and lowered in a conventional manner using a main halyard 5 that is attached to a grommet 6 incorporated into the head portion of the sail 3. The sail 3 also includes a grommet 8 incorporated into the clew portion of the sail 3 (as illustrated in FIG. 11) that is used to flatten the sail 3 using a conventional outhaul system. The sail 3 also includes a grommet 7 (as illustrated in FIG. 11) incorporated into the tack portion of the sail 3 that is used to attach the sail 3 to the forward portion of the boom 2. FIG. 1 also shows the structure of the inflatable cells of the main sail 3 portion of the sail (as illustrated in FIG. 11 and 12) and leading edge portion 13 (as illustrated in FIG. 5 and 6). 
     FIG. 2 is a cross section view of the adjustable camber inflatable wing-shaped sail in a fully inflated state (on starboard tach). This view shows the main sail attached to a conventional fixed mast 1. The main sail will feature a leading edge portion 13 and a main body portion 3. 
     The main body portion 3 of the main sail will feature two inflatable cells (port inflatable cell 9 and starboard inflatable cell 10) enclosed in an outer cover 12. The outer cover 12 can be manufactured using an elastic material that will stretch. The two inflatable cells of the main body portion 3 feature a common center panel 4, forward wall 28, outer wall 29, outer cover 12, and shifting slots 39. Refer to FIGS. 9, 10, 11 and 12 for a more detailed illustration of the main body portion 3. 
     FIG. 3 is a cross section view of the adjustable camber inflatable wing-shaped sail in a fully inflated state, as it would be used to power a boat at a broad reach point of sail. This view shows the main sail attached to a conventional fixed mast 1. 
     FIG. 4 is an isometric view of the main sail (main body portion 3 and leading edge portion 13) attached to a mast 1 viewing parallel with the mast (looking down from the top of the mast toward the boat deck). 
     FIG. 5 is a cross section of the leading edge portion 13 and mast 1. The leading edge portion 13 is attached to the mast 1 with a two-piece Velcro® system 85 (or attachment system or method that has similar attachment characteristics) extends from the lower portion of the mast, just above the boom to within a few inches from the masthead. One part of the Velcro® system is attached to the mast 1 with a glue or other semi-permanent attachment system and the other part is attached to the inner wall 14 of the leading edge portion 13. The leading edge portion will each feature two inflatable cells (port inflatable cell 15 and starboard inflatable cell 16) contained in two cell pockets, which are each formed by an inner wall 14, outer cover 17, and a rear wall 18. The rear walls 18 are attached to the outer cover with a zipper 87. The cell pockets will extend from the lower portion of the mast, just above the boom to within a few inches from the masthead. 
     The inner wall 14 and rear wall 18 of the cell pockets will be manufactured using a non-elastic or semi-non-elastic material such as conventional sail cloth (canvas, mylar, dacron, etc.) that will resist stretching when pressure is applied from the inflation of the inflatable cells (port inflatable cell 15 and starboard inflatable cell 16). The outer cover 17 will be manufactured using a non-elastic material such as plastic, fiberglass, or other material that has similar characteristics. 
     When fully inflated, the two inflatable cells (port inflatable cell 15 and starboard inflatable cell 16) will form a semi-wedge shape as seen in FIG. 6. The inflatable cells contained in the cell pockets will extend from the lower portion of the mast, just above the boom to within a few inches from the masthead. The inflatable cells (port inflatable cell 15 and starboard inflatable cell 16) will be manufactured using a non-porous or semi non-porous flexible material. The inflatable cells will feature a non-porous or semi non-porous outer cover 17 with shaping panels 19 (as illustrated in FIG. 6) attached to the interior opposed sides of the inflatable cells (port inflatable cell 15 and starboard inflatable cell 16). 
     FIG. 6 is isometric view of a portion of the leading edge port side inflatable cell (starboard side inflatable cell 16 will be a mirror image). The inflatable cell is formed by an inner wall, outer wall, rear wall, and bottom wall. The inner wall, outer wall, rear wall, and bottom wall will be manufactured using a non-porous material. The inflatable cells will each feature shaping panels 19 attached to the interior opposed sides of the cell (inner wall, outer wall, rear wall, and bottom wall). These shaping panels 19 will be attached (using glue, heat, or other existing or future bonding method) to the inner walls of the cells. These shaping panels 19 will define the shape of the inflatable cell (port inflatable cell 15 and starboard inflatable cell 16) when inflated with an inflation medium. These shaping panels 19 will have pass-through holes 20 that will allow the inflation medium to pass from the various sections of the inflatable cell (port inflatable cell 15 and starboard inflatable cell 16). Each of the two inflatable cells (port inflatable cell 15 and starboard inflatable cell 16) will feature one inflating/ deflating tube 21. The inflating/deflating tubes 21 will extend the entire length of the inflatable cell. See FIG. 8 for a more detailed view of the inflating/deflating tubes. The inflating/deflating tube 21 (port and starboard) will connect to a main connecting valve 22 (one port and one starboard) located at the bottom of the leading edge portion of the sail 3. Refer to FIG. 7 for a detail. 
     The two inflatable cells (port inflatable cell 15 and starboard inflatable cell 16) can be inflated or deflated both in unison or independently to adjust the shape of the leading edge portion 13 of the main sail. The inflatable cells (port inflatable cell 15 and starboard inflatable cell 16) will be inflated with an inflation medium that will be transferred into the inflatable cell (port inflatable cell 15 and starboard inflatable cell 16) via a main inflatable/deflatable tube 21 incorporated into the inflatable cell (see FIG. 6). The inflation medium will be transferred into the inflating/deflating tubes 21 via the main connecting valves 22 that connects to an inflation hose 23 (refer to FIG. 7). 
     FIG. 7 is an isometric view of the bottom walls of the main sail (main body portion 3 and leading edge portion 13 of the main sail). The inflation medium will be transferred into the leading edge inflating/deflating tubes via connecting valves 22, which are connected to the inflation hoses 23. One of the two inflatable hoses connects to the port main connecting valve and the other to the starboard main connecting valve. The inflation hoses 23 will attach to connecting valves 22 using male/female locking couplings 24. 
     This figure also shows the main connecting valves 32 and inflation hoses 37 that are part of the main body portion 3 of the main sail. One of the two inflatable hoses connects to the port main connecting valve and the other to the starboard main connecting valve. The inflation hoses 37 will attach to the main connecting valves 32 using male/female locking couplings. 
     FIG. 8 is an isometric view of a small section of the inflating/deflating tube that is part of the leading edge inflatable cells and main body inflatable cells. The inflating/deflating tubes will feature open ports 25, rigid shaping rings 26 with a thin flexible non-porous cover 27. 
     FIG. 9 is a view of the main body portion 3 of the main sail attached to a mast. This illustration shows the outer cover 12, mast 1, attachment points 30, and shifting slots 39. The main body portion 3 of the main sail will feature two inflatable cells (port inflatable cell and starboard inflatable cell) enclosed in an outer cover 12. The outer cover 12 will be attached (zipper or permanent) to the leech portion of the center panel. The outer cover will not be directly attached to the forward wall of the inflatable cells. The outer cover 12 will be manufactured using a sail cloth material (canvas, dacron, mylar, or other material that have similar or superior characteristics). 
     FIG. 10 is a close-up isometric view of the luff portion of the main body portion of the main sail. The inflatable cells feature a common center panel 4, forward wall 28, outer wall 29, bottom wall 31, outer cover 12, and shifting slots 39. The figure also shows the attachment points 30 used to attach the sail to the mast. 
     FIG. 11 is an isometric view of the main body portion 3 of the main sail. The main body sail 3 will feature two inflatable cells (port inflatable cell 9 and starboard inflatable cell 10) enclosed in an outer cover (as seen in FIG. 9). 
     The inflatable cells will feature two inflating/deflating tubes (as illustrated in FIG. 12) that will exit the main body sail 3 via one of six connecting valves; bottom connecting valves 32 (one each side of the sail; port and starboard), first reef point connecting valves 33 (one each side of the sail; port and starboard), second reef point connecting valves 34 (one each side of the sail; port and starboard). The bottom connecting valves 32 will be located along bottom of the main body sail 3. The first reef point connecting valves 33 will be located along the luff (forward panel 28) of the main body sail 3, at the same level as the first reef point grommets 35. The first reef point will have two grommets 35; one incorporated into the luff portion and the other incorporated into the leech portion of the main body sail 3. The second reef point connecting valves 34 will be located along the luff of the main body sail 3, at the same level as the second reef point grommets 36. The second reef point will have two grommets 36; one incorporated into the luff portion and the other incorporated into the leech portion of the sail 3. This illustration also shows the position of the tack grommet 7 and clew grommet 8. 
     When the main body sail 3 is lowered to the first reef point, the sail is secured using a conventional reefing hook and first reefing line. The main body inflation hoses 37 (one each side of the sail; port and starboard--See FIG. 7) can be disconnected from the bottom connecting valves 32 and connected to the first reefing point connecting valves 33. When the main body sail 3 is lowered to the first reef position, the back-flow valves contained in the first reef point connecting valves 33 (port and starboard) can be turned to the closed position. This allows the inflation medium to inflate the inflatable cells (port inflatable cell 9 and starboard inflatable cell 10) located in the upper portion of the main body sail 3, above the first reef point, but prevents the inflation medium from inflating the inflatable cells (port inflatable cell 9 and starboard inflatable cell 10) located in the lower portion of the sail 3, below the first reef point. The same method is used to inflate the upper portion of the inflatable port inflatable cells (port inflatable cell 9 and starboard inflatable cell 10) above the second reef point, but prevents the inflation medium from inflating the inflatable cells (port inflatable cell 9 and starboard inflatable cell 10) located in the lower portion of the sail 3, below the second reef point. 
     When the sailing vessel is on port tach the starboard inflatable cell 10 should be fully or near fully inflated and the port inflatable cell 9 should be deflated or only partially inflated. When the sailing vessel tachs from the port tach to a starboard tach, the starboard inflatable cell 10 should be fully deflated and the port inflatable cell 9 should be fully or nearly fully inflated. The action of deflating one side and inflating the other allows the forward portion of the outer cover 12 to shift from the deflated side to the inflated side. The shifting slots 39 as seen in FIG. 9 and 10 allows the forward portion of the outer cover to shift from the windward side to the leeward side of the sail. 
     When the inflatable cell situated on the leeward side of the boat is fully or nearly fully inflated, the inflatable cell situated on the windward side of the boat can be partially re-inflated to obtain the optimum or desired shape of the main sail 3 and sail. 
     FIG. 12 is a cutaway isometric view of the port side inflatable cell (starboard inflatable cell will be a mirror image) that is used as part of the main body portion of the main sail. The inflatable cells (port inflatable cell and starboard inflatable cell) will be of various sizes and shapes depending on the size and dimensions of the main body sail 3. When fully inflated, the cells will form a semi-airfoil shape that will be the main portion and trailing edge of the sail. The inflatable cells (port inflatable cell and starboard inflatable cell) will be manufactured using a non-porous or semi non-porous material. The inflatable cells will feature non-porous or semi non-porous outer walls (refer to Nos. 28 and 29 of FIG. 10) with shaping panels 11 attached to the interior opposed sides of the inflatable cells (port inflatable cell and starboard inflatable cell). The shaping panels 11 will be attached (using glue, heat, or other existing or future bonding method) to the inner walls of the cells. These shaping panels 11 will define the shape of the inflatable cells (port inflatable cell and starboard inflatable cell) when inflated with an inflation medium. All shaping panels 11 will have pass-through holes 38 that will allow the inflation medium to pass from the various sections of the inflatable cells (port inflatable cell and starboard inflatable cell). For viewing purposes, the pass-through holes are not shown on all of the shaping panels. 
     Each of the two inflatable cells (port inflatable cell and starboard inflatable cell) will feature one inflating/deflating tube 40. The main inflating/deflating tubes 40 will be situated near the luff portion of the inflatable cells (port inflating/deflating tube shown, starboard inflating/deflating tube will be a mirror image). The inflating/deflating tubes will extend the entire length of the inflatable cell. See FIG. 6 for a more detailed view of the inflating/deflating tubes. The inflating/deflating tube 40 (port and starboard) will connect to a one of three main connecting valves 32, 33, or 34 (three port and three starboard--see FIG. 11). 
     The two inflatable cells (port inflatable cell and starboard inflatable cell) can be inflated or deflated both in unison or independently to adjust the shape of the main portion of the sail. The inflatable cells (port inflatable cell and starboard inflatable cell) will be inflated with an inflation medium that will be transferred into the inflatable cell (port inflatable cell and starboard inflatable cell) via a main inflatable/deflatable tube 40 incorporated into the inflatable cell. 
     The inflation medium will be transferred into the inflating/deflating tubes 40 via an inflation hose 37 that connects to the main connecting valves 32, 33, or 34 (see FIG. 7). One of the two inflatable hoses connects to the port main connecting value and the other to the starboard main connecting value. The inflation hoses 37 will attach to the main connecting valves 32, 33, &amp; 34 using male/female locking couplings (see FIG. 7). 
     FIG. 13 is an isometric (cut-away) view of the head sail portion of the invention attached to a conventional sailing rig of a typical sailing vessel, that includes a fixed mast 1 and a headstay 50. The head sail will feature a leading edge cone 51 and a main body sail 52 portion. The head sail is attached to the leading edge cone in a conventional manner that includes several attachment points (refer to No. 61 of FIG. 16 and 17) incorporated into the luff portion of the center panel of the main body portion 52 of the head sail that are inserted into a &#34;C&#34; shaped channel that is part of the leading edge cone 51. 
     FIG. 14 is a side view of the head sail in a fully inflated state on (starboard tach). This view shows the main body sail 52 and the leading edge cone 51 attached to a conventional headstay 50. 
     The main body sail 52 is raised and lowered in a conventional manner using a head sail halyard 54 that is attached to a grommet 55 incorporated into the head portion of the main body sail 52. The main body sail 52 also includes a grommet 56 incorporated into the tack portion of the head sail (refer to FIG. 17) and a grommet 57 incorporated into the clew portion of the main body sail. The tack grommet 56 is used to attach the sail to the foredeck and the clew grommet 57 is used to attach head sail control sheets. 
     FIG. 15 is a cross section view of the head sail in a fully inflated state on (starboard tach). This view shows the main body sail 52 and the leading edge cone 51 attached to a conventional headstay 50. 
     FIG. 16 is a cross section view of the main body portion of the head sail in a fully inflated state (starboard tach). The head sail will feature two inflatable cells (port inflatable cell 64 and starboard inflatable cell 65) enclosed in an outer cover 66. This view shows the outer panel 58, forward panel 59, center panel 53, and headstay attachments 61. This view also shows the inflating/deflating tubes (port inflating/deflating tube 62 and starboard inflating/deflating tube 63). 
     The outer cover 66 will be attached (zipper or permanent) to the leech portion of the center panel 53. The outer cover will not be directly attached to the forward wall of the inflatable cells. The outer cover 66 will be manufactured using a sail cloth material (canvas, dacron, mylar, or other material that have similar or superior characteristics). 
     FIG. 17 is a cut away isometric view of the main body portion of the head sail. The upper portion of the figure shows the outer cover 66 and shifting slots 69. The lower portion of the figure shows the inflatable cell. The two sided inflatable cell (including one port inflatable cell 64 and one starboard inflatable cell 65) will be of various sizes and shapes depending on the size and dimensions of the head sail. When fully inflated, the cells will form a semi-airfoil shape that will be the main portion and trailing edge of the head sail. This figure also shows the position of the tack grommet 56 and clew grommet 57. 
     The inflatable cell (port inflatable cell 64 and starboard inflatable cell 65) will be manufactured using a non-porous or semi non-porous material. The inflatable cells will feature a non-porous or semi non-porous outer walls with shaping panels 68 attached to the interior opposed sides of the inflatable cells (port inflatable cell 64 and starboard inflatable cell 65). The shaping panels 68 will be attached (using glue, heat, or other existing or future bonding method) to the inner walls of the cells. These shaping panels 68 will define the shape of the inflatable cells (port inflatable cell 64 and starboard inflatable cell 65) when inflated with an inflation medium. These shaping panels 68 will have pass-through holes 60 that will allow the inflation medium to pass from the various sections of the inflatable cells (port inflatable cell 64 and starboard inflatable cell 65). 
     Each side of the inflatable cell (port inflatable cell 64 and starboard inflatable cell 65) will feature one inflating/deflating tube (port inflating/deflating tube 62 and starboard inflating/deflating tube 63). The main inflating/deflating tubes (port inflating/deflating tube 62 and starboard inflating/deflating tube 63) will be situated near the luff portion of the inflatable cells. The inflating/deflating tubes will extend the entire length of the inflatable cell. See FIG. 8 for a more detailed view of the inflating/deflating tubes. The port inflating/deflating tube 62 and starboard inflating/deflating tube 63 will connect to the main connecting valves (Refer to FIG. 20). 
     The two inflatable cells (port inflatable cell 64 and starboard inflatable cell 65) can be inflated or deflated both in unison or independently to adjust the shape of the main body portion of the head sail. The inflatable cells (port inflatable cell 64 and starboard inflatable cell 65) will be inflated with an inflation medium that will be transferred into the inflatable cell (port inflatable cell 64 and starboard inflatable cell 65) via a main inflating/deflating tubes (port inflating/deflating tube 62 and starboard inflating/deflating tube 63) incorporated into the inflatable cell. The inflation medium will be transferred into the inflating/deflating tubes (port inflating/deflating tube 62 and starboard inflating/deflating tube 63) via the main connecting valves 67 that connects to an inflation hose 70 (refer to FIG. 20). 
     FIG. 18 is an isometric view of the leading edge cone 51 headstay 50 and a swivel plate located near the masthead. The leading edge cone 51 is fitted over the headstay 50 and is attached to the headstay with two swivel plates; one located near the headstay attachment at the deck and the other located near the mast head. The leading edge cone is an semi-arrowhead shaped piece as shown in the cross section view FIG. 19. The width of the leading edge cone ranges from relatively wide near the bottom (near the fore deck of the sailing vessel) to relatively narrow near the masthead (top of the mast). The exact width of the leading edge cone is dependent on the size of the sailing vessel, rig, and maximum camber of the head sail. The length of the leading edge cone is dependent on the size of the sailing vessel and rig, but is generally the same (slightly shorter) length as the headstay 50. 
     FIG. 19 is a cross section view of the leading edge cone. The leading edge cone is manufactured using either: (a) a Styrofoam (or other material that has similar characteristics) core 72 with an outer cover 73 (fiberglass and gelcoat or other material that has similar characteristics such as plastic) or (b) a hollow core 72 with a fiberglass and gelcoat cover 73 (or other material that has similar characteristics such as plastic). The hollow core version of the leading edge cone will feature two inflatable cells contained within the outer cover 73. The inflatable cells (port side inflating cell 79 and starboard side inflatable cell 80) can be inflated or deflated 
     The inflatable cells (port side inflating cell 79 and starboard side inflatable cell 80) will be inflated with an inflation medium that will be transferred into the inflatable cell (port side inflating cell 79 and starboard side inflatable cell 80) via a main inflating/deflating tubes (port inflating/deflating tube 81 and starboard inflating/deflating tube 82) incorporated into the inflatable cell. The inflation medium will be transferred into the inflating/deflating tubes (port inflating/deflating tube 81 and starboard inflating/deflating tube 82) via the main connecting valves 75 that connects to an inflation hose 76 (refer to FIG. 20). 
     The outer cover of the inflatable version will also feature either one or several hinge points 83 to allow the outer walls of the cover 73 to be drawn toward the center. The inner portion of the leading edge cone will feature a (metallic) headstay tube 74 that runs the entire length of the leading edge cone. This tube 74 attaches to the two swivel plates (the lower swivel plate is identified as 78 on FIG. 20). The swivel plate attachments allow the leading edge cone to swivel around the headstay (refer to FIG. 20). The head sail is attached to the leading edge cone in a conventional manner that includes several attachment points incorporated into the luff portion of the center panel of the main body sail (refer to FIG. 17), that are inserted into a &#34;C&#34; shaped channel 77 that is part of the leading edge cone. 
     FIG. 20 is an isometric view of the bottom walls of the head sail (main body portion 52 and leading edge cone 51). The inflation medium will be transferred into the inflating/deflating tubes 62 and 63 of the main body portion of the head sail via the main connecting valves 67, which are connected to the inflation hoses 70. One of the four inflatable hoses connects to each of the inflatable cells; leading edge port inflatable cell, leading edge starboard inflatable cell, port main body inflatable cell, and starboard main body inflatable cell. The inflation hoses 70 will attach to the main connecting valves 67 using male/female locking couplings 71. The inflation hoses 76 will attach to the leading edge connecting valves 75 using male/female locking couplings 71. 
     When the sailing vessel is on port tach the starboard inflatable cells should be fully or near fully inflated and the port inflatable cells should be deflated or only partially inflated. When the sailing vessel tachs from the port tach to a starboard tach, the starboard inflatable cells should be fully deflated and the port inflatable cells should be fully or nearly fully inflated. The action of deflating one side and inflating the other allows the forward portion of the outer cover to shift from the deflated side to the inflated side. The shifting slots 69 (refer to FIG. 17) allows the forward portion of the outer cover to shift from the windward side to the leeward side of the sail. 
     When the inflatable cell situated on the leeward side of the boat is fully or nearly fully inflated, the inflatable cell situated on the windward side of the boat can be partially re-inflated to obtain the optimum or desired shape of the head sail.