[NSRCA-discussion] Annhedral Stab

[shinden1 at cox.net]

Hum ,,,
another convert aye! <g>
Bryan

---- "george w. kennie" <geobet at gis.net> wrote: 
> 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
> >>>
> >>> _______________________________________________
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> >>> 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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