wing tip shape - del Klipped 4 reposting..

[Del Rykert]

Hi John.
    We seal the gap primarily to obtain consistent and equal response to the 
deflection of the flight surface.  Granted in a not well supported hinged 
surface it may also encourage flutter and ailerons extended into wingtip are 
very susceptible to flutter. With surfaces sealed I see no advantaged of 
rounding the leading edge or not.
     Happy Turkey Day to all.

                         del
               NSRCA - 473

----- Original Message ----- 
From: "John Pavlick" <jpavlick at idseng.com>
To: <discussion at nsrca.org>
Sent: Wednesday, November 24, 2004 9:38 PM
Subject: RE: wing tip shape


> Hey, That's how they are on my Super Kaos Jr. Not exactly 45 degrees, but
> the outboard 3" is tapers toward the tip. If you do this by sanding the
> bottom edge of the aileron at the tip, you also add a little washout to 
> help
> prevent tip stalls. Not sure if it's enough to make a difference but I can
> land this plane nose high without any surprises. Someone mentioned 
> rounding
> the leading edge of control surfaces rather than beveling them - I've 
> always
> done this unless the surface is really thick (like a barn-door aileron). 
> In
> the 1st U.S. R/C Flight School training manual (the red one) the idea of
> control surfaces with round leading edges that are slightly thicker than 
> the
> fixed surface is discussed. They claim it reduces flutter (without sealing
> the gaps) and makes the control response less speed sensitive. Has anyone
> tried this? It would be interesting to hear if it works on pattern planes.
>
> John Pavlick
> http://www.idseng.com
>
>
>> -----Original Message-----
>> 


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