Have you calibrated the jet efflux from a turbine helo. It's around 20 mph, all the energy has been soaked up by the FPT, any residual kinetic energy in the exhausst is obviously inefficient waste.. .. .It would therefore need boosting and piping to the furthest most extreme of the airframe. Plumbers nightmare. Weight restrictive.. .. .Best leaving it to heating salamis/pasty's in the winter <img border="0" title="" alt="[Big Grin]" src="biggrin.gif" /> <img border="0" title="" alt="[Big Grin]" src="biggrin.gif" /> <img border="0" title="" alt="[Big Grin]" src="biggrin.gif" />