[NSRCA-discussion] Annhedral Stab

[J N Hiller]

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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