RE: Power to weight nowadays
I think what I have said has been misunderstood, I do not subscribe to using any more thrust than a particular airframe is designed for. So if it is designed for say 120N then use that as a max. The point I was trying to get across was that fitting a higher thrust engine does give you advantages.
As an example my Graupner Inspiration is designed for 80-100N but is fitted with a 140N engine which comes in useful for my local grass strip, particularly during the winter months. I would say I am careful with throttle management and do not put the airframe under any more stress than a 100N engine would.
When it comes to safety I'm right behind you David.
Rob.