I don't have an answer, but I can broaden the question;
During type training on the Bell 206 the other day, we were reviewing the Flight Manual instruction that an in flight relight/restart not be attempted above 12000'. So I asked the obvious, can you attempt a start on the ground at that altitude? If the engine is stopped, it does not know if it is stopped on the ground, or in flight!
The instructor did not have an answer, perhaps one will emerge here....
Pilot DAR
What is your maximum elevation approved for take-off? I would guess it's below 12,000' MSL as are "most" aircraft.
I suspect the key factors involved in re-light envelopes are:
-Igniter type and power rating (joules)
-Effective fuel air ratio at the point of ignition
DBW