[NSRCA-discussion] aero question

[george w. kennie]

Jay,
I'm sure that you're aware that the condition you reference is "adverse 
couple" and sounds like the center of pressureof the rudder is located too 
high partly caused by insufficient dihedral in the wing. Increasing rudder 
area down low might help, but I think the real culprit is dihedral. Vertical 
C.G. might also have an effect. Is all the hardware located high in the 
airframe? Also, how far below the datum is the wing located. If it's a lot, 
this could also contribute. I agree that the condition is there all the 
time, just exacerbated by the extreme deflelction angles. I can't see how, 
if the dihedral angle is correct, that incidence is going to affect roll 
issues.
G.





----- Original Message ----- 
From: "JShulman" <jshulman at cfl.rr.com>
To: "NSRCA" <nsrca-discussion at lists.nsrca.org>
Sent: Saturday, January 05, 2008 8:42 PM
Subject: [NSRCA-discussion] aero question


> Just back from flying with Ryan and we were talking about some 
> possibilities that would cause a plane to roll on KE with more
> rudder, but not less. Would a more raked tailpost fix this heavy rudder 
> roll? Ex- Hard Left rudder produces a noticeable Right roll,
> but "regular rudder" for normal KE needs no correction. What do you guys 
> think...
>
> Regards,
> Jason
> www.jasonshulman.com
> www.shulmanaviation.com
> www.composite-arf.com
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