wing tip shape

[Bill Glaze]

Yep--"Figure 8" stitch, with heavy weight waxed thread.  Worked just 
fine, too.  Bill Glaze

Rcmaster199 at aol.com wrote:

> Lance, the rounded leading edge of the control surface was practiced 
> way back in the golden (stone?) age of model aviation, when the hinge 
> material was plain thread. Believe it or not, the control surfaces 
> were literaly sewen into the wing or stab or fin. Surface actuation 
> essentially allowed the surface to "roll", ie- it did not pivot about 
> a single axis as present set-ups do
>  
> Yor observation is correct: a rounded edge hinged with present hinges, 
> will tend to bind.
>  
> MattK
>  
> In a message dated 11/25/2004 12:47:09 AM Eastern Standard Time, 
> patterndude at comcast.net writes:
>
>     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
>
>  

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