On 29 Jul 2013, at 13:54, Jon S. Berndt <jonsberndt@comcast.net> wrote:

Beta is positive when the wind hits the right side of the vehicle. This is
the only standard convention I have ever seen. I would recommend strongly
against artificially changing the sign of this parameter as output from
JSBSim.

Which raises the question, why does Yasim use the opposite sign? Does it use the opposite sign for Beta too?

James