[NSRCA-discussion] aero question

[Nat Penton]

Jerry
Do you mean they were using a cambered airoil ??     Nat

----- Original Message ----- 
From: "Jerry Stebbins" <JAStebbins at worldnet.att.net>
To: "NSRCA Mailing List" <nsrca-discussion at lists.f3a.us>
Sent: Sunday, January 06, 2008 10:32 PM
Subject: Re: [NSRCA-discussion] aero question


> 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
>>>>> No virus found in this outgoing message.
>>>>> Checked by AVG Free Edition.
>>>>> Version: 7.5.516 / Virus Database: 269.17.13/1210 - Release Date:
>>>>> 1/5/2008
>>>>> 11:46 AM
>>>>>
>>>>>
>>>>> _______________________________________________
>>>>> NSRCA-discussion mailing list
>>>>> NSRCA-discussion at lists.nsrca.org
>>>>> http://lists.nsrca.org/mailman/listinfo/nsrca-discussion
>>>>
>>>> _______________________________________________
>>>> NSRCA-discussion mailing list
>>>> NSRCA-discussion at lists.nsrca.org
>>>> http://lists.nsrca.org/mailman/listinfo/nsrca-discussion
>>>>
>>>
>>> _______________________________________________
>>> NSRCA-discussion mailing list
>>> NSRCA-discussion at lists.nsrca.org
>>> http://lists.nsrca.org/mailman/listinfo/nsrca-discussion
>>
>> _______________________________________________
>> NSRCA-discussion mailing list
>> NSRCA-discussion at lists.nsrca.org
>> http://lists.nsrca.org/mailman/listinfo/nsrca-discussion
>
> _______________________________________________
> NSRCA-discussion mailing list
> NSRCA-discussion at lists.nsrca.org
> http://lists.nsrca.org/mailman/listinfo/nsrca-discussion
>