Plan B sails are painstakingly crafted using conventional, shaped and glued seams.
The sail forms have been developed from theory, trial and observation while sailing, using a masthead video camera.
I use translucent DuPont Mylar film in both 50 and 75 micron thicknesses. The # 2 mainsails, # 3 jibs and mainsails are made from the heavier film.
The available alternative, smooth finish, transparent 50 micron DuPont Mylar film is preferred by some sailors, particularly for jibs, because tell-tales are readily visible on both sides of the sail. This untreated film may be more durable.
All reinforcing patches are white for a clean appearance, but for identification you can choose from a selection of coloured jib-luff pocket tapes. The luff-wire is freely enclosed within the tape.
Mainsails have monofilm tape reinforced luffs, further reinforced and pierced to be attached to the mast with nine loose ties, tied firmly around a 3 mm diameter spacer that is subsequently removed. The mainsail is cut to stream smoothly from the lee of the mast. Sail camber can be trimmed by adjusting the backstay to bend the masthead aft. Both jib and main are cut to have camber at very little wind strength. As the wind strength increases, the jib luff sags increasing the jib camber, the loosely tied mainsail luff moves aft increasing the mainsail camber to compensate. Progressively the jib boom lifts to ease the jib leech as the mast bends flattening the mainsail and easing the mainsail leech, keeping the yacht in balance. With loose ties, the cunningham down-haul can be configured to ease the luff and dramatically increase the mainsail camber as the main-boom is eased.
Alternatively, the #1 mainsail can be supplied with a pocket to accept a wire jack-stay to be attached firmly at the aft side of the mast at the head, tack and with three ties, tied without or with a very small spacer. The sail luff allowance is cut to suit a straight mast and the sail will accept only little aft mast bend. This mainsail has more camber in the middle to upper sections in light winds and slightly less camber as the wind increases before the leech eases at higher wind strengths.
The black IOM insignia is standard and you can choose, at extra charge, to have registration numbers and country designation letters clearly applied in black permanent ink, using one-time stencils.
The sails are supplied with luff wires, but these are not inserted, so as the sails will roll smoothly between brown paper within 90 mm. diameter cardboard shipping tubes.