Advise how to reduce rudder to roll coupling

[PPandelaers]

Jerry,

 

Very interesting, never saw it this way, See if I get it right.

 

Do you mean really the cross section of the lower wing that's catching air
stream. I can see that indeed for the bottom wing in knife edge, not for the
top-wing though.

 

Is this in your opinion the reason why we apply dihedral?

 

If so, it would mean that the wing tips need to be at the same level as the
vertical CG to avoid roll coupling by this effect. It seems to me that this
would require significant dihedral on many planes of the low-wing type, more
than I usually see. Or, the CG is much closer to the wing than I always
thought.

 

Just confirm if this is what you meant.

 

Regards

 

Patrick

 

-----Oorspronkelijk bericht-----
Van: discussion-request at nsrca.org [mailto:discussion-request at nsrca.org]
Namens Jerry Voth
Verzonden: zaterdag 6 augustus 2005 19:30
Aan: discussion at nsrca.org
Onderwerp: Re: Advise how to reduce rudder to roll coupling

 

Thought first it had to do with dihedral, but in knife edge, the wing
doesn't fly? What could it have do with it?

 

The wing may not fly in knife edge, but when you apply top rudder, the tail
drops and if there is dihedral, the top of the upper wing and the bottom of
the lower wing are exposed to the airstream which will roll the airplane
back toward level flight or if it is correct, will hold the wing vertical.

 

Jerry Voth

 

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