bildan wrote:


A little fuzzy. We did try full deployment of one spoiler at high
speed and the results were not pretty.

The roll 'effect' produced by asymmetric spoilers is fairly constant
with changing airspeed but aileron authority increases with increasing
speed. At no time is the roll effect of an open spoiler greater than
the aileron roll effect.

However, and this is the big one, the yaw effect produced by
asymmetric spoilers increases with the square of airspeed and will
quickly overwhelm rudder authority at higher speeds.

Is this what you experienced? I'd expect the rudder authority to also
increase with the square of the airspeed, just as lift does for the same
angle of attack.


--
Eric Greenwell - Washington State, USA
* Change "netto" to "net" to email me directly

* "Transponders in Sailplanes" http://tinyurl.com/y739x4
* Sections on Mode S, TPAS, ADS-B, Flarm, more

* "A Guide to Self-launching Sailplane Operation" at www.motorglider.org