Thanks gents, so it sounds like what I had in mind (so long as the start is smooth and flameless) the time is not of primary importance.

With a few tweaks/adjustments between temps, burner and stick flow I got the time right down without compromising the already good kero start.

Other than the kero starts I have seen at flying events and normal club flying (and those are usually a hidden from sight internal install) I could only really find video of one which showed what I needed to see from an engine in the same thrust class, problem is it is a hot restart and there is some flame during the preheat phase so possibly not typical.

Anyway thanks again for the feedback, definitely one of the positive things about RCU

Rob.