[NSRCA-discussion] Aero design question

[Dean Pappas]

Hi Gang,
The excellent axial rolling charecteristic of some designs is due to a lot more than where the inboard end of the ailerons end. Nonetheless, all of my designs used ailerons that ended far from the fuse! The only downside is that having a bit of aileron in front of the stab offers a useful trimming tool: trailing the ailerons up or down will change the effective stab incidence, and this was a powerful adjustment tool back when we didn't have plug-in adjustable "everything".
 
You note Akiba's well trimmed airplanes. There is some smart design going on there!
 
later,
           Dean
 
 
 
-----Original Message----- 
From: nsrca-discussion-bounces at lists.nsrca.org on behalf of John Ferrell 
Sent: Sat 9/2/2006 7:48 AM 
To: NSRCA Mailing List 
Cc: 
Subject: Re: [NSRCA-discussion] Aero design question



	I have spent a fair amount of time considering this situation. I have concluded there is no reason to take the risk of adding unnecessary turbulence to the empennage.
	 
	In gentle maneuvering it probably has little effect. In aggressive maneuvering (think snaps) it likely leads to inconsistent behavior. Inboard ailerons may contribute additional available force in 3D maneuvers (hanging on prop?).  
	 
	Other related considerations are aileron shape and the hinging geometry. I also suspect fat fuselages reduce these effects by dispersing the turbulence over a greater volume of air.
	 
	Just my two cents worth!
	 
	John Ferrell    W8CCW
	"My Competition is not my enemy"
	http://DixieNC.US
	

		----- Original Message ----- 
		From: Peter Pennisi <mailto:pentagon.systems at bigpond.com>  
		To: 'NSRCA Mailing List' <mailto:nsrca-discussion at lists.nsrca.org>  
		Sent: Friday, September 01, 2006 8:35 PM
		Subject: [NSRCA-discussion] Aero design question


		 

		My current model has ailerons which extend a fair way towards the fuselage (Comp-ARF IMPACT) What effect does the turbulence coming off the aileron have on the tail plane. I am currently building another IMPACT (IMHO flies extremely well) which I am considering to reduce their size by cutting and fixing the inboard part to the wing in an attempt to clean up the airflow over the tail plane during rolling maneuvers .  The model does roll well but it could be better.

		 

		Am I barking up the wrong tree – any thoughts!

		 

		Peter 

		
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