From memory anything under 900m at max weight was tight for departure. I also remember that there was a fairly lengthy period of time between the start of the rotation and when you had a bit of height and speed where I reckon you would have been pretty stuffed if you lost an engine. Mind you, there were always trees at the end of the strips I went into as well as it being hot with **** all wind. Best to talk to someone who is operating one into strips and is still current before having a row with the missus I reckon.