FGproperties/velocities/mach

description

This is a dimensionless factor, the plane speed divided by the sound speed, it's the norm of the speed from 3.0 fg version, was unclear before

main use

• The pitot tube use this to give dynamique pressure.
• it's used in some planes to display the mach speed, i recommend to make them use:

/instrumentation/airspeed-indicator/indicated-mach

conflict - solution

solved

Yasim was giving the longitudinaly projeted mach velocity, and JSBSim the norm of the mach vector. this give false airspeed when alpha or beta are not nul. the retained solution was to use the mach norm for both, with some change in the pitot code.