wing tip shape

[ORLANDO FRETS]

The best way to see it is to make a mock up. Take scrap balsa and simulate
a control surface, make one of them round, put them together, and watch
what happens. 
I'm using that setup on my 240 Pylon Racer.

ORLANDO FRETS
ojfrets at earthlink.net



> [Original Message]
> From: Lance Van Nostrand <patterndude at comcast.net>
> To: <discussion at nsrca.org>
> Date: 11/25/2004 12:46:37 AM
> Subject: Re: wing tip shape
>
> Please someone explain this rounded control surface thing to me.  If we
use 
> a CA hinge and but the aileron to the wing, then the only way the surface 
> can move is if it has a beveled point.  A rounded interface will bind
unless 
> the aileron has a gap to begin with.  However, if all we are saying is to 
> round the part of the bevel that blends into the aileron, then I get it.
>
> Confused again....
> --Lance
>
> ----- Original Message ----- 
> From: "John Pavlick" <jpavlick at idseng.com>
> To: <discussion at nsrca.org>
> Sent: Wednesday, November 24, 2004 8:38 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-----
> >> From: discussion-request at nsrca.org
> >> [mailto:discussion-request at nsrca.org]On Behalf Of John Ferrell
> >> Sent: Wednesday, November 24, 2004 5:43 PM
> >> To: discussion at nsrca.org
> >> Subject: Re: wing tip shape
> >>
> >>
> >> If you carry the aileron all the way to the tip it is good
> >> medicine to clip
> >> the trailing outboard corner at 45 degrees to help suppress any
> >> tendency to
> >> flutter. It is common practice on combat models.
> >>
> >> John Ferrell
> >> My Competition is not my enemy!
> >> http://DixieNC.US
> >>
> >> ----- Original Message -----
> >> From: "Jeff Hughes" <jeffghughes at comcast.net>
> >> To: <discussion at nsrca.org>
> >> Sent: Wednesday, November 24, 2004 4:29 PM
> >> Subject: Re: wing tip shape
> >>
> >>
> >
> > ---
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