> You have to be careful of people standing around because when the master switch ... is on, the motor ... can silently spring to life at an inadvertent bump of

> You have to be careful of people standing around because when the master switch ... is on, the motor ... can silently spring to life at an inadvertent bump of the throttle. The commercial version of this should probably "idle" the propellers at 30 RPM or something... fast enough to notice, without burning much power.