Cannot Launch a Helicopter in SITL

Hey all,

So I have been trying to simulate just the standard trad heli in mission plan SITL.

I have mavproxy running in the background to get past the motor interlock by sending the right pwm on the right channel.

I have sent an auto mission with a takeoff waypoint and then executed auto and used mavproxy to execute throttle. Which is how I would do it on a multicopter.

I have issued a guided takeoff command and still nothing.

Is this a bug? Can anyone point me in the right direction?