Top Hinging Ailerons and Elevators

[s.vannostrand at kodak.com]

I've done several models this way, but have never elected to do a pattern 
ship this way.  My reasons aren't verified by wind tunnel testing, but 
they are (hopefully) at least rational. 

An aileron requiring 20 degrees of down throw requires a 20 degree bevel. 
When center hinged the disruption in the airfoil is equal on top and 
bottom of the wing, and is minimized.  When top hinged, although it looks 
pretty, there is a major disruption on the bottom wing surface and almost 
none on top.  I think the extreme size of the "vee" on the bottom is 
enough to affect the sensitive flight characteristice of a pattern plane. 
Add to that the fact that Advanced and Masters spend almost half their 
time inverted and you see you need an airfoil that is effective in both 
attitudes.

One thing I have contemplated, but not done, is offset hinged my ailerons. 
 You know, the kind of hinging where the leading edge of teh aileron is 
rounded and the hingepoint pivot is at the center of the circle?  This 
could be done light and would eliminate gaps altogether.

--Lance





"Mike Turgeman" <mike at bartan.com>
Sent by: discussion-request at nsrca.org
04/07/2003 03:07 AM
Please respond to discussion

 
        To:     <discussion at nsrca.org>
        cc: 
        Subject:        Re: Top Hinging Ailerons and Elevators


Hi all,
I am flying this way for about 10 years. My method for hooking up the 
ailerons or elevator is to use the wing cover (monokote or other) as the 
hinge. All you need is to make sure that the bottom cover and the top one 
are joint together at the hinge line.
With this method you get no gap aileron which has better response and the 
wing has a very nice one panel  top view.
I can send some photos off list.
 
Mike Turgeman
Israel
----- Original Message ----- 
From: Steve Barlow 
To: discussion at nsrca.org 
Sent: Sunday, April 06, 2003 1:22 AM
Subject: Top Hinging Ailerons and Elevators

Guys,
 
I'm building the CA Models Widebody 60/90, and it calls for hinging the 
ailerons and elevators from the top, as opposed to the standard middle 
hinge, double bevel type.
 
I've never done this before, and am a bit curious about the effects of 
hinging the surfaces this way, and also the actual steps, especially the 
location and direction of the hinge points themselves.  These are foam 
wings, in case that wasn't clear.
 
Can you guys help me out here, with maybe some general instructions, or a 
link to them?
 
Thanks in advance,
Steve

-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.f3a.us/pipermail/nsrca-discussion/attachments/20030407/583f03e7/attachment.html