REFLECTOR:Aileron Fence

[Scott Derrick]

Is Rodney Brim still on this group?

He's had flow fences on his Velocity for over a year?

Scott

Chuck Jensen wrote:
> 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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>>
>>
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> 
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