Matt

Thanks for that info, you are not wrong had some trouble starting today, new kerostart and fully charged A123's, strange how first few starts were fine.

Ah well 2 cell LiPo or LiIo it is then.

One other question whilst I have your ear, what difference ( if any ) does max engine rpm make to exhaust gas velocity and model speed, or is it just a question of an excess of thrust over drag that will determine model speed.

Just realised that is not really a jetcat question per say more of general aerodynamic one

Thanks any way

Phil.