program on bbc iplayer

the science of speed.

   theres alot about this in laurie smith and andrew preeces book SAILPOWER the science of speed. 
Ill try scan it in later and post it.

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thenewpete Send Private Message Find Member's Posts Newbie Joined: 31 Jan 09 Location: United Kingdom Online Status: Offline Posts: 24	Post Options Post Reply Quote thenewpete Report Post Quote Reply Topic: program on bbc iplayer Posted: 17 Feb 09 at 4:24pm
	theres alot about this in laurie smith and andrew preeces book SAILPOWER the science of speed. Ill try scan it in later and post it.

tack'ho Send Private Message Find Member's Posts Really should get out more Joined: 08 Feb 06 Location: United Kingdom Online Status: Offline Posts: 1100	Post Options Post Reply Quote tack'ho Report Post Quote Reply Posted: 17 Feb 09 at 6:58pm
	If you watched closely hidden among the simplified science....(seriously though the aerodynamsist actually told a porky pie!) winglets increase lift for a given wing length, they still cause drag though so it's 6 and 2 threes really.
	I might be sailing it, but it's still sh**e!

I luv Wight Send Private Message Find Member's Posts Visit Member's Homepage Really should get out more Joined: 28 Jan 05 Location: United Kingdom Online Status: Offline Posts: 628	Post Options Post Reply Quote I luv Wight Report Post Quote Reply Posted: 17 Feb 09 at 9:54pm
	The wingspan of passenger jets is limited by onground docking etc, so there is 'extra' lift compared to the same span without the tips. If the wings were longer, there would also be more lift, less drag. Moth T-foils allowed smaller rudders due to the tip-loss effects, but they have an an increase in wetted area and drag. There is a net benefit due to the T-foil stabilising the boat.
	http://www.bloodaxeboats.co.uk Andy P foiling Int Moth GBR3467 Freedom 21 Codling

redback Send Private Message Find Member's Posts Visit Member's Homepage Really should get out more Joined: 16 Mar 04 Location: Tunbridge Wells Online Status: Offline Posts: 1502	Post Options Post Reply Quote redback Report Post Quote Reply Posted: 23 Feb 09 at 11:17pm
	Genoas are popular because they give more area without increasing the length of the spars. It would probably be more efficient to have the extra area without the overlap. At one time Scorpions had the jib tacked down behind the shute and this meant more overlap and easier spinnaker deployment. It didn't last long though the class soon opted for getting the jib out into the fresh air and they reverted to tacking the jib down on the bow even if it meant a more difficult use of the spinnaker.