[NSRCA-discussion] aero question

[Jerry Stebbins]

Nat/George, one of the pictures of the planes at the Worlds had a rudder 
that was curvedto one side. I do not remember which one but will find the 
picture. Struck me as an attempt to compensate for lack of effectiveness one 
way.
I'll find it and send it to you.
I have tried the incidence on one of our test planes and it had very little 
measured effect. A turbulator helps quite  bit on the aft of end the canopy. 
Got to be a better way. I am going to follow the "flow/stall" trail and see 
what I can get in black and white measurements.
Jerry
----- Original Message ----- 
From: "george w. kennie" <geobet at gis.net>
To: "NSRCA Mailing List" <nsrca-discussion at lists.nsrca.org>
Sent: Sunday, January 06, 2008 9:44 PM
Subject: Re: [NSRCA-discussion] aero question


> Ahhh yes, I see that Nat. Now all I have to do is remember it.
> G.
>
>
>
>
> ----- Original Message ----- 
> From: "Nat Penton" <natpenton at centurytel.net>
> To: "NSRCA Mailing List" <nsrca-discussion at lists.f3a.us>
> Sent: Sunday, January 06, 2008 4:50 PM
> Subject: Re: [NSRCA-discussion] aero question
>
>
>> George
>> Wing incidence determines the roll axis. Which can effectively raise or
>> lower the cp of the rudder.
>>
>> Ed White's idea regarding asymetric rudder stall is a strong possibility.
>> Nat
>>
>> ----- Original Message ----- 
>> From: "george w. kennie" <geobet at gis.net>
>> To: "NSRCA Mailing List" <nsrca-discussion at lists.f3a.us>
>> Sent: Sunday, January 06, 2008 1:48 PM
>> Subject: Re: [NSRCA-discussion] aero question
>>
>>
>>>
>>> Jay,
>>> I'm sure that you're aware that the condition you reference is "adverse
>>> couple" and sounds like the center of pressureof the rudder is located
>>> too
>>> high partly caused by insufficient dihedral in the wing. Increasing
>>> rudder
>>> area down low might help, but I think the real culprit is dihedral.
>>> Vertical
>>> C.G. might also have an effect. Is all the hardware located high in the
>>> airframe? Also, how far below the datum is the wing located. If it's a
>>> lot,
>>> this could also contribute. I agree that the condition is there all the
>>> time, just exacerbated by the extreme deflelction angles. I can't see
>>> how,
>>> if the dihedral angle is correct, that incidence is going to affect roll
>>> issues.
>>> G.
>>>
>>>
>>>
>>>
>>>
>>> ----- Original Message ----- 
>>> From: "JShulman" <jshulman at cfl.rr.com>
>>> To: "NSRCA" <nsrca-discussion at lists.nsrca.org>
>>> Sent: Saturday, January 05, 2008 8:42 PM
>>> Subject: [NSRCA-discussion] aero question
>>>
>>>
>>>> Just back from flying with Ryan and we were talking about some
>>>> possibilities that would cause a plane to roll on KE with more
>>>> rudder, but not less. Would a more raked tailpost fix this heavy rudder
>>>> roll? Ex- Hard Left rudder produces a noticeable Right roll,
>>>> but "regular rudder" for normal KE needs no correction. What do you 
>>>> guys
>>>> think...
>>>>
>>>> Regards,
>>>> Jason
>>>> www.jasonshulman.com
>>>> www.shulmanaviation.com
>>>> www.composite-arf.com
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>>>>
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