Originally Posted by bidrseed2

Take off roll is 70 yds off tarmac. It needs full up elevator to rotate, probably cause of the pitch power couple forcing the nose down.
Strangely, if you're an idiot and take off with one engine at idle, you only Rotate 10 yds later......

long story how i know that!

i don't know anything about the K85G but I'm told 60 size engines aren't enough as it's very draggy, especially with pylons on. 80 seems perfect but I've got 1.5kg of nose weight in it, so if the K85G are heavier than merlin VT80 then you could be stitching yourself up.