[NSRCA-discussion] Full Flying Stab

[Ron Van Putte]

If you pivot a surface at the aerodynamic center of the surface,  
there is no additional pitching moment generated on the surface as it  
is pivoted.  There is an inherent zero-lift pitching moment present  
as a result of the shape of the surface, but you can always build a  
symmetric surface, which has no inherent pitching moment at zero lift.

Ron VP

On Aug 14, 2009, at 12:11 PM, Duane Beck wrote:

> What prevented aerodynamic forces from pushing against the spring  
> and moving the stab away from the desired position?
>
> Duane
>
>> From: "Ron Van Putte" <vanputte at cox.net>
>> To: "General pattern discussion" <nsrca-discussion at lists.nsrca.org>
>> Sent: Friday, August 14, 2009 1:05:35 PM GMT -05:00 US/Canada Eastern
>> Subject: Re: [NSRCA-discussion] Full Flying Stab
>>
>> I was faced with this problem many years ago when I build a canard
>> (tail-first) airplane with a full flying stab.  I solved it by
>> pivoting the stab at the aerodynamic center of the stab, to minimize/
>> eliminate moment change with deflection of the stab.  Then I spring
>> loaded the stab with a soft helical spring in one direction, so the
>> stab, in effect, had no "backlash".
>> Ron VP
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