wing tip shape (now surface hinging)

[Ted Sander]

About to head into the shop to start hacking ailerons out of my wing cores.
For appearance sake, I had planned to top hinge them.  I take it from the
discussion,  that the way the surface is hinged has no noticeable effect in
flight - provided the gap is sealed? Correct?

 

Ted Sander

 

 

-----Original Message-----
From: discussion-request at nsrca.org [mailto:discussion-request at nsrca.org] On
Behalf Of Bill Glaze
Sent: Friday, November 26, 2004 8:53 AM
To: discussion at nsrca.org
Subject: Re: wing tip shape

 

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"  <mailto:jpavlick at idseng.com> <jpavlick at idseng.com>
To:  <mailto:discussion at nsrca.org> <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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