[NSRCA-discussion] Annhedral Stab

[Nat Penton]

The lifting requirement of the stab is determined by CG, not wing incidence. 
We put the CG behind the wing AC and this apportions the load - as desired. 
So there <G>. Actually you put the wing more positive to center the 
elevator.                  Nat

----- Original Message ----- 
From: "george w. kennie" <geobet at gis.net>
To: "NSRCA Mailing List" <nsrca-discussion at lists.nsrca.org>
Sent: Monday, April 21, 2008 7:24 PM
Subject: Re: [NSRCA-discussion] Annhedral Stab


> Hey Nat,
> You know I love ya, buuuuuuttt, ...........I don't think it's immaterial. 
> Of
> course I ain't no genius, but that's the reason I use just a little more
> positive in the wing to increase the force of the downwash which lessens 
> the
> lifting force of the stab which eliminates the belly pitch in K.E.
> Georgie
>
>
>
>
> ----- Original Message ----- 
> From: "Nat Penton" <natpenton at centurytel.net>
> To: "NSRCA Mailing List" <nsrca-discussion at lists.nsrca.org>
> Sent: Monday, April 21, 2008 1:41 PM
> Subject: Re: [NSRCA-discussion] Annhedral Stab
>
>
>> It is my opinion wing/stab vertical separation is immaterial - other than
>> for wing/stab interference considerations.
>>
>> The downwash is a tube the diameter of the wingspan, so one inch up or
>> down
>> vertically with the stab is the same difference. 
>> Nat
>>
>> ----- Original Message ----- 
>> From: "J N Hiller" <jnhiller at earthlink.net>
>> To: "NSRCA Mailing List" <nsrca-discussion at lists.nsrca.org>
>> Sent: Monday, April 21, 2008 4:20 AM
>> Subject: Re: [NSRCA-discussion] Annhedral Stab
>>
>>
>>> Downwash:
>>> I almost mentioned downwash earlier as a seemingly significant
>>> contributor
>>> to flight trim / setup. Vertical positioning of the stab in the downwash
>>> appears to be important when matched to aircraft weight and horizontal
>>> flight speed.
>>> Would it be safe to assume that having a flat stab in line with the wing
>>> would produced a pitch to the canopy or dose running that deep in the
>>> downwash just make it hunt?
>>> Thanks
>>> Jim
>>>
>>>
>>> -----Original Message-----
>>> From: nsrca-discussion-bounces at lists.nsrca.org
>>> [mailto:nsrca-discussion-bounces at lists.nsrca.org]On Behalf Of Nat Penton
>>> Sent: Sunday, April 20, 2008 9:38 PM
>>> To: NSRCA Mailing List
>>> Subject: Re: [NSRCA-discussion] Annhedral Stab
>>>
>>> Jim
>>> I used anhedral, about 5 degrees, on my Express because the wing/stab
>>> separation is effectively zero. My fear was interference from the wing
>>> shear
>>> line and the idea was to have the stab operate in a broader range of the
>>> wash.
>>>
>>> It is impossible to get the stab out of the downwash.
>>>
>>> I have experienced heart pounding rudder interference from forward fins
>>> and
>>> wanted to avoid those puzzling instances of "was that me or was that the
>>> airplane".
>>>                                        Nat
>>> ----- Original Message -----
>>> From: "J N Hiller" <jnhiller at earthlink.net>
>>> To: "NSRCA Mailing List" <nsrca-discussion at lists.nsrca.org>
>>> Sent: Sunday, April 20, 2008 1:01 PM
>>> Subject: [NSRCA-discussion] Annhedral Stab
>>>
>>>
>>>> Can I open a discussion on why some designs have an annhedral stab?
>>>> Was it to lower the effective flying height of the stab to reduce the
>>>> wing
>>>> to stab vertical offset and knife edge belly pitch, or is there some
>>>> other
>>>> reason?
>>>> Jim Hiller
>>>>
>>>> _______________________________________________
>>>> NSRCA-discussion mailing list
>>>> NSRCA-discussion at lists.nsrca.org
>>>> http://lists.nsrca.org/mailman/listinfo/nsrca-discussion
>>>>
>>>
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>>
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>
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