REFLECTOR:Aileron Fence

[Chuck Jensen]

Thanks for both comments.  Now that I think about it, Scotts explanation
about the canard being the limiting factor, not the main wings (since they
don't stall---usually), then, an ever so slight improvement in lift on the
main wing is not going to do much, if anything, for the overall performance,
per Richard.  I still suffer from Piperistis and Cessenatosis thinking.

Chuck

-----Original Message-----
From: reflector-admin@tvbf.org [mailto:reflector-admin@tvbf.org]On
Behalf Of richard@riley.net
Sent: Friday, May 23, 2003 1:43 AM
To: reflector@tvbf.org
Subject: Re: REFLECTOR:Aileron Fence


It appears from some wind tunnel testing done on a similar wing 
configuration at NG for the Pegasus follow-on that TE fences do have a 
small but measurable positive effect.

Though they certainly wouldn't change the aoa that the canard stalls at, 
they appear to increase lift slightly for the main wing at the same 
aoa.  So, the plane would be flying a *little* slower at canard stall.  But 
we're talking very small changes, perhaps a knot.  They - in theory - would 
also decrease TO roll a *little* - but we're talking about single digit 
feet.  Maybe even single digit inches.  The increase in aileron 
effectiveness is a much more significant change.


At 05:06 PM 5/22/03 -0600, you wrote:
>First bubble to pop is that the aileron fence will not reduce your 
>"planes" stall speed, that's determined by your canard. It would reduce 
>the stall speed of the main wing thus providing an even bigger margin 
>against a Deep Stall.
>
>Klaus S. did some testing of this on a long EZ and had good results for 
>increasing lift which would increase your climb rate.  It is also supposed 
>to increase effectiveness of the ailerons at slow speed. Search for "Klaus 
>lightspeed" and he has a web page describing the tests and results.
>
>I don't know about takeoff distance since your canard will still want to 
>fly at the same speed.
>
>If you want to get better take off performance, climb performance, better 
>aileron effectiveness I would highly recommend installing VG's on the main 
>wing and canard.
>
>The factory has tested layout templets.  YOu can buy the VG's from the 
>factory of from Computer Certainty(I recommend these).
>
>Scott
>
>Chuck Jensen wrote:
>> From the Newsletter, some preliminary flight testing seemed to show than
an
>>inboard aileron fence had merit for reducing takeoff distance, increasing
>>climb rate and perhaps reducing stall speed while not affecting cruise
>>performance and turning characteristics.  Has this become a concensus or
is
>>the jury still out?  And, is there a standard template for such a fence?
>>Chuck Jensen
>>XL RG
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