JSBSim change from Dave Luff:

JSBSim change from Dave Luff:

Attached is a fix to add a short period of cranking time required
before the engine fires.  I've also added a little hack to limit the
torque applied by the starter motor when the rpm is less than 10 in
order to avoid the rpm overshooting idle in the first time step when
the prop is producing very little resistance due to the low rpm.