Turbo Prop Question
 

Can a turbo prop be used in a pusher configuration? Will the exhaust damage/destroy the prop?

Thanks,

-Jorden

RE: Turbo Prop Question
 

I've just asked this question of Mike Murphy, the expert on miniature two-stage engines and designer of the Wren Turboprop.

"It will work, but the prop will get hot!"

I asked "How hot? "

"Well, the temperature of the exhaust gas is about 400 degrees, but it disperses very quickly. "

I think someone would have to try it and find out.

Sara Parish
Wren Turbines

RE: Turbo Prop Question
 

Thanks Sara.

I did find picture of a full scale plane, the Piaggio Avanti P-180. I had found pics of another full scale plane a while ago, but I can't find them now. So it does look like it's possible. I wonder if it's possible as a scale model, using a metal or carbon fiber prop.

-Jorden

RE: Turbo Prop Question
 

I don't know if Helicopters apply the same here or not.
A turbine heli hovering inverted would be very similar to what you are describing.
The turbine exhaust would be above the main rotor and the air is being blown down so the hot gases are going thru the rotors.
I have not heard of any negative issues with the carbon main rotors.
You may want to check with Bergen Helicopters to get more info on if this is an issue or not.

RE: Turbo Prop Question
 

A club buddy has this turbine cobra, and the blades are cold after a flight.....

RE: Turbo Prop Question
 

My son flies full size turboprops. On the one with metal props, there is no restriction on reverse thrust, in fact they often use it to back into and out of parking spots on crowded ramps. The one with carbon fibre props has all kinds of restrictions on the use of reverse thrust, but generally, they can not use it below 60 knots. The heat affects both the props and the cabin windows. Those engines run at very similar temps as our little ones.

Metal props on model airplanes are not allowed here, and I would guess in many other countries as well..............