Hi Dave and thanks for your help.I am long long yeahrs involved in helicopters.2 yeahrs ago
i was designde my small coax heli.First i like build a backpack helicopter bud its to danger !
The heli must be aviable to autoroate,for this you need biger rotors!the rotor area disc load must be under 8Kg per square meters.
have a nice weekend
Reinhard