AP_Scripting: added fixed wing boost motor example

[tridge]

This is for aircraft using an ICE fwd engine with an electric boost motor

[peterbarker]

Not checking safety switch state. And probably several other ways we usually stop motors turning (throttle suppression? eSTOP?).

That might be OK, but we should definitely call it out in a comment!

[tridge]

Not checking safety switch state. And probably several other ways we usually stop motors turning (throttle suppression? eSTOP?).

safety switch will still work, doesn't need special handling as it impacts all outputs other than masked ones. Adding any check for it would be incorrect

[IamPete1]

I would hard code this to use one of the "motor" output functions. boost_throttle would be ideal. The advantage of using a "motor" function rather than a scripting one is that E stop will still work. Possibly the intent was to use such a function in anycase?

[tridge]

I would hard code this to use one of the "motor" output functions. boost_throttle would be ideal

we can't use k_boost_throttle as AP_MotorsMulticopter already outputs to it

The advantage of using a "motor" function rather than a scripting one is that E stop will still work.

E-stop is extremely rare on quadplanes (I can't recall seeing a log with it enabled)

[tridge]

we need to add a k_ThrottleRaw which is the throttle before the ICE override, so that when the ICE engine dies we don't kill the booster. When using k_throttle the booster would stop as the ICE engine would go into re-start, which drops the throttle that the booster uses in this script