I have an AMT Mercury turbine in mine, not the HP type, and it produces about 8.5kg of thrust. This is more than enough and the take off on wet grass is no more than 30m in nil wind conditions. The turbine is located with the front mounting strap just infront of the former at the rear of the main gear opening. I used the Ziroli intake ducts and moulded a fueltank to sit between the inlet ducts.
I will take some pictures of the installation tonight and post them tomorrow.

John