[NSRCA-discussion] Annhedral Stab

[george w. kennie]

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
>>>
>>
>> _______________________________________________
>> 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 


-- 
I am using the free version of SPAMfighter for private users.
It has removed 5858 spam emails to date.
Paying users do not have this message in their emails.
Get the free SPAMfighter here: http://www.spamfighter.com/len