Aerodynamics Discuss the concepts of aerodynamics here

Aileron sensitivity

Old 10-26-2010, 07:39 PM
  #1  
r4pt0r
Member
Thread Starter
 
r4pt0r's Avatar
 
Join Date: Dec 2008
Posts: 49
Default Aileron sensitivity

Ive built a few planes now, all 4 channel(rud,ele,throttle, ail) and my ailerons are never good enough to do a complete roll, it only banks. my first planes used torque rods so i get that that wouldnt be effective, the rod was 2 ft long, but i used push/pull rods on my last and still no roll, i cant even get near a 90 bank. wht will make my ailerons more effective? i understand that highwing aircraft, or planes with lots of stability,either due to dihedral or a cg focused low in the plane, wont roll easy.
r4pt0r is offline  
Old 10-26-2010, 08:40 PM
  #2  
JetPlaneFlyer
Super Contributor
 
JetPlaneFlyer's Avatar
 
Join Date: Mar 2009
Location: Aberdeen, Scotland
Posts: 6,120
Default

I think you might have identified a part of the problem.. planes with high degree of lateral stability (like with lots of dihedral) will tend to be a bit sluggish on ailerons.

Other factors that have a big influence are:
  • Flying speed... get plenty of speed up before you attempt a roll. All controls will be much more effective when you have good flying speed. At slow speed ailerons especially can become very sluggish and sometimes even cause the plane to yaw in the opposite direction to the actual control input. If you dont have much power dive to build up speed.
  • Are the ailerons large enough and do they have adequate movement? is the movement 'slop' free and without excessive friction/stiffness?

Last edited by JetPlaneFlyer; 10-26-2010 at 09:40 PM.
JetPlaneFlyer is offline  
Old 10-26-2010, 08:42 PM
  #3  
CHELLIE
Super Contributor
 
CHELLIE's Avatar
 
Join Date: Oct 2006
Location: Hesperia, So. Calif
Posts: 19,188
Default

Originally Posted by r4pt0r View Post
Ive built a few planes now, all 4 channel(rud,ele,throttle, ail) and my ailerons are never good enough to do a complete roll, it only banks. my first planes used torque rods so i get that that wouldnt be effective, the rod was 2 ft long, but i used push/pull rods on my last and still no roll, i cant even get near a 90 bank. wht will make my ailerons more effective? i understand that highwing aircraft, or planes with lots of stability,either due to dihedral or a cg focused low in the plane, wont roll easy.
Make the ailerons nice and wide and long, and give yourself 45% of travel, up and down from level, then you wont have any problems making rolls, also air speed helps a lot too, so give yourself lots of power and speed, hope that helps, Chellie
CHELLIE is offline  
Old 10-26-2010, 09:22 PM
  #4  
Rodneh
Member
 
Join Date: Oct 2005
Location: Florida, USA
Posts: 753
Default

Rudder input along with the ailerons often helps the roll rate, especially during the last half of the roll. And yes, any dihedral is a detriment for ease of doing a roll.
Rodneh is offline  
Old 11-01-2010, 12:58 AM
  #5  
quorneng
Super Contributor
 
quorneng's Avatar
 
Join Date: Jul 2008
Location: Cheshire, UK
Posts: 1,846
Default

You don't actually need big ailerons to roll but you do have to have to maintain sufficient speed and use the rudder to counter the nose drop.
Provided you have enough speed & power a climbing roll is easier as you have time to complete the manoeuvre before the nose has dropped to far.
With a high wing, small ailerons and a heavy low set battery this can still roll, albeit rather slowly.
Click image for larger version

Name:	Complete.JPG
Views:	97
Size:	49.0 KB
ID:	138105
Keep trying.
quorneng is offline  
Old 11-01-2010, 06:09 PM
  #6  
Sparky Paul
Super Contributor
 
Sparky Paul's Avatar
 
Join Date: Dec 2006
Posts: 1,116
Default

And down elevator as it goes around, to keep the nose up.
Sparky Paul is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
squidger
RC Radios, Transmitters, Receivers, Servos, gyros
5
08-20-2010 09:43 PM
sam94
General Electric Discussions
12
11-02-2009 12:43 PM
WildnFree
RC Radios, Transmitters, Receivers, Servos, gyros
1
07-01-2008 09:11 PM
RandolphNav
RC Radios, Transmitters, Receivers, Servos, gyros
1
05-15-2007 12:52 AM
futboldude18
General Electric Discussions
11
11-08-2006 02:08 PM

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
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


Quick Reply: Aileron sensitivity


Contact Us Archive Advertising Cookie Policy Privacy Statement Terms of Service

Copyright 2018 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.

Page generated in 0.07415 seconds with 16 queries