Bevel on Control Surfaces?  
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All Forums >> RC Airplanes >> Kit Building >> Bevel on Control Surfaces?
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Bevel on Control Surfaces? - 6/21/2002 2:11:51 AM   
dmax64


 

Posts: 47
Joined: 5/19/2002
From: Wauchula, FL, USA
Status: offline 		I'm Building a Weeks Solution X Biplane. I want to set it up to do 3D. My question is, on the tail surfaces should I put a 45 degree bevel on the control surfaces only l< or should I bevel both the control and the fixed surfaces. >< . I've seen it done both ways, what are the pros and cons.
       Post #: 1

Bevel on Control Surfaces? - 6/21/2002 2:37:58 AM   
Chris300s



Posts: 309
Joined: 12/15/2001
From: Mount Clemens, MI, USA
Status: offline 		Pros - cons, more work - less work. It's generally accepted that you don't need more than 45deg. of throw for 3D. That is unless you're flying gliders....
My personal experience has been with +/- 60deg. of throw, I backed off and now run the standard +/- 45deg on rudder, +/- 40 deg. on elevator, +/- 25deg. on ailerons.
I'd only bevel one side and save the strength of the trailing edges.
Chris

(in reply to dmax64)
       Post #: 2

Bevel on Control Surfaces? - 6/22/2002 9:17:20 AM   
Giant Scale



Posts: 856
Joined: 6/8/2002
From: Baltimore, MD, USA
Status: offline 		The bevel angle that you use on the LE and TE will depend to some extent on the thickness of the wood you are using. I like to bevel the LE of the surface a full 45 degrees and then bevel the TE between 10-15 degrees. This will give you plenty of throw. On the rudder on my 35% Giles 202 I had to add an extra 1/2" plank to the LE of the rudder in order to get a 45 degree bevel,since the rudder is narrower at the top and wider at the bottom. You need to place a protractor on the end of the LE plank you are using and see how much bevel you can get. I try to leave a flat spot along the hinge line of 1/16-1/8 inch and then taper the the bevel to a sharp edge where it meets the surface.

(in reply to dmax64)
       Post #: 3

Only the LE of control surfaces - 6/29/2002 6:56:17 AM   
Rcpilot


 

Posts: 6660
Joined: 3/20/2002
From: Arvada, CO, USA
Status: offline 		You should only bevel the control surfaces. By working the trailing edge of the wing, rudder or elevator; you might be asking for trouble.

Beveling the trailing edged of the surfaces can create a funny "vortex" of air going over the hinge line. This has caused flutter and even a few hinge separations.

If you want a really slick bevel on those ailerons, just glue a piece of triangle stock on them and then use a planer to knock a flat spot on the hinge line. Works AWESOME and a lot less hassle than trying to sand those control surfaces.

If your worried that this process will make the control surface "grow" and make it stick out too far; just plane a little off the surface before glueing on the triangle stock.

Good luck.

_____________________________

Airplanes have expiration dates. It''s just not printed anywhere on them.
I''m not really an airplane pilot; but I did stay at a Holiday Inn Express last night.

(in reply to dmax64)
       Post #: 4

Bevel on Control Surfaces? - 6/29/2002 7:59:01 AM   
MinnFlyer



Posts: 19981
Joined: 4/22/2002
From: Willmar, MN, USA
Status: offline 		Last year I built a GP Extra 330L. They recommended a double bevel on the tail feathers if you want to do 3D.

_____________________________

Mike B.
AMA# 42400 www.gettingairborne.com

"Those are my principles. If you don't like them, I have others." - Groucho Marx

(in reply to dmax64)
       Post #: 5

Bevel on Control Surfaces? - 7/1/2002 10:10:59 PM   
Madmoc



Posts: 14
Joined: 6/19/2002
From: Napa, CA, USA
Status: offline 		I bevel both. Even if you only want 30deg. of throw it is stronger to bevel both surface 15 deg rather than 30 on one surface. Just make sure your hinges move freely and you seal the gap between the two surfaces. I am flying an Aeroworks 31% 300L and get 50deg on elev. 30 deg on ail and haven maxed my rudder yet but is around 45 deg. All surfaces are double bevel per the plans.

(in reply to dmax64)
       Post #: 6

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