[NSRCA-discussion] Annhedral Stab

[Nat Penton]

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
>>
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>
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