Displacement during snap rolls (was Why is it so quiet?)

[Bob Richards]

A stalled wing is still producing lift. Just look at the 3D fliers.
 
If you look at a lift curve (angle-of-attack vs lift), the lift keeps increasing linearly until the wing begins to stall. Even after a portion of the wing has begun to stall, the lift will still increase, just not linearly. At some point (a very deep stall) the lift will decrease, but never go to zero.
 
JMHO.
 
You are correct that a stall can occur at any airspeed or attitude. Also, the plane does not have to be stalled just because it is below the "stall speed".
 
Someone mentioned in this discussion about it being impossible to break a wing doing a snap roll, if they do then they did not do a proper snap roll. It is possible to break a wing, from the mere fact that the angle-of-attack can't possibly increase from a normal to a stalled condition instantaneously -- it must go through a range of AOA that will include the maximum lift AOA. Technically, the "snap" did not break the wing, the entry into the snap DID.
 
In full-scale planes, there is something called "maneuvering speed".  Over that speed, it is possible that full control surface deflection can cause the G forces to exceed the design limits of the airframe.  I'll bet that the number of full-scale pilots that have succesfully performed snap-rolls under the "maneuvering speed" far exceeds those that have done snaps over that speed. :-)
 
 
Bob R.


michael middleton <gofastmike at cox.net> wrote:


v\:* {	BEHAVIOR: url(#default#VML)}o\:* {	BEHAVIOR: url(#default#VML)}w\:* {	BEHAVIOR: url(#default#VML)}.shape {	BEHAVIOR: url(#default#VML)}an aircrafts wing can be stalled in any attitude and air speed.angle of attack becomes so agressive that the wing stops producing lift due to turbulance over the surface------------ANY SPEED OR ATTITUDE.
----- Original Message ----- 
From: Karl G. Mueller 
To: discussion at nsrca.org 
Sent: Wednesday, December 29, 2004 7:17 AM
Subject: Re: Displacement during snap rolls (was Why is it so quiet?)


All,
 
 
I have a question on the aircraft to be in a "stalled condition during a snap roll":
How do you get the airplane into a stalled condition on a vertical downline snap?
 
Karl G. Mueller
kgamueller at rogers.com
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