good guess Puntosaurus. So the next part.... if you have a start where you can see proper flames out of the back of the tail pipe is it possible to be quick enough to avoid a T4 overlimit.
saw one (no not me) and then very surprised that there was no recorded overlimit, but then again there was no recorded 'flight" either...
I'm limited on trubine hours and experience but i would have expected a start "hot" enough to get a three foot flame out the back for a few seconds to be too hot for limits....