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dlucier
Master Marine Consultant

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Virgin Islands (United Kingdom)
7583 Posts
Response Posted - 03/15/2003 :  01:41:40  Show Profile
<b>"If the rudder is symmetrical how can it create lift on one side...?"</b>

Ben,

Check out this link. It explains how a symetrical appendage like a keel or rudder creates lift.

http://www.sailnet.com/collections/articles/index.cfm?articleid=colgat005

<img src="http://www.catalina25-250.org/c25sm.gif" border=0>Don Lucier<img src="http://www.catalina25-250.org/c25sm.gif" border=0>
<img src="http://im1.shutterfly.com/procserv/47b2cc32b3127cce92e981259d130000001010" border=0>
North Star SR/FK
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Arlyn Stewart
Master Marine Consultant

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USA
2980 Posts
Response Posted - 03/15/2003 :  08:29:44  Show Profile  Visit Arlyn Stewart's Homepage
Symetrical foils lift when they are placed in a positive angel of attack hence why the little bit of weather helm is so vital to good weathering as it places both the rudder and keel positive to the upwind desired mark.

On the other hand... Asymetrical foils lift if there is laminar flow over there surfaces and lift towards the longer of the two forms. Their lift is controlled by both the speed of the flow as well as attack angle.

The hull form is a foil... and becomes asymetrical when heeled... this is why the crew is sent to leeward in light air to heel the boat. It's why wide beam boats are given to increasing weather helm when heeled excessively as thicker foils generate more lift. That is also why wide beam boats suffer more hunting at anchor.

Arlyn C-250 W/B #224
<img src="http://www.stewartfam.net/arlyn/rr.jpg" border=0>
N/E Texas and Great Lakes

[url="http://www.cox-internet.com/arlynstewart/"]Arlyn's C250 Mods n Cruisin Stories[/url]
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Ben - FL
Admiral

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880 Posts
Response Posted - 03/15/2003 :  12:15:40  Show Profile  Visit Ben - FL's Homepage
Thanks for the info, very helpful. My printer is wide open on the Colgate articles. <img src=icon_smile.gif border=0 align=middle>

Safe voyages,
Ben, FL s/v Chick-a-pea C250wk
<img src="http://www.members.aol.com:/benraye/pictures/fullsail.jpg" border=0>
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Notice: The advice given on this site is based upon individual or quoted experience, yours may differ.
The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.