wing tip shape (now surface hinging)

[Rcmaster199 at aol.com]

Ted, in my experience it makes no difference as long as the horn is located  
correctly to produce symmetrical throw top and bottom. More difficult to do 
that  with a top hinged surface than a center hinged surface, so be aware of 
this  pitfall. Yet, the top hinged surface is much easier to seal than a center 
hinged  surface, so there are always compromises in everything we do. 
 
Personally, I always center hinge my surfaces. 
 
MattK
 
 
In a message dated 11/26/2004 10:35:41 AM Eastern Standard Time,  
tedsander at comcast.net writes:

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_ (mailto: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




 
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