Go Back  RCU Forums > RC Airplanes > Aerodynamics
Reload this Page >

Ugly Stik aileron differential.

Notices
Aerodynamics Discuss the physics of flight revolving around the aerodynamics and design of aircraft.

Ugly Stik aileron differential.

Old 11-07-2017, 02:51 PM
  #1  
bigR
Thread Starter
My Feedback: (2)
 
Join Date: Aug 2003
Location: Granada hills, CA
Posts: 57
Likes: 0
Received 0 Likes on 0 Posts
Default Ugly Stik aileron differential.

Hi,

I'm flying a Great Planes Bik Stik (Original Ugly Stik size). It has a couple of inches of dihedral to avoid the “drooping wing” effect. Motor is an OS 91 Surpass four stroke. I have lots of differential in the ailerons. It is hard to control when inverted. What can be done to make it friendlier to handle when it is upside down? I realize the shoulder wing and dihedral don’t help but there must be something that can be tried. I have individual aileron servos and a computer radio.

Thanks for the help,



John in Kalifornia
Old 11-07-2017, 05:45 PM
  #2  
HighPlains
My Feedback: (1)
 
Join Date: Mar 2003
Location: Over da rainbow, KS
Posts: 5,087
Received 4 Likes on 4 Posts
Default

What is the point of all the differential? We have a rudder, learn to use it.
Old 11-07-2017, 07:54 PM
  #3  
speedracerntrixie
My Feedback: (29)
 
speedracerntrixie's Avatar
 
Join Date: Jun 2010
Location: Happy Valley, Oregon
Posts: 9,509
Received 173 Likes on 149 Posts
Default

A little differential is a good thing, maybe 3/32" more up throw then down throw is about all that is needed. A shoulder wing airplane really does not need dihedral, the biggest gain would be to cut the wing apart and put it back together flat. Some other things to look at is the wing and stab incidence. You want then both at zero just the same as the engine thrustline. If these are not right then make them right. Once the differential is reduced, the incidence and thrustlines have been verified/fixed do a test flight with zero elevator trim. If it requires up trim ( most likely will ) then move the CG back until it no longer needs any trim. After all this I promise the inverted performance will be much improved.

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service -

Copyright © 2024 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.