[Mark Bolton]

Dear Forum,

I have a 0 - 320 that has been sitting around for a while. I am going to complete the firewall forward shortly b,ut wont be in a position to complete the aircraft for a while longer.

I would like to run the engine once in a while, in the shed.

I would like to build a club fan to make sure the motor is delivering full power and to cool it properly whilst getting it up to temperature and getting the motor a little exercise.

Does anyone know of a design and or a "how to" ? I am sure they cant be all that difficult to construct and would postulate that provided the dimensions were correct, they would present a predictable drag and hence would serve as a calibration gauge on the engine rpm / horsepower output etc. I have googled this subject hard and have found no information so any leads would be much appreciated.

Once I have constructed this device I will document the process and make a website.

Thank you all in anticipation.

Regards

Mark

 

[DanH]

Mark,
Contact Don Bates. Nice guy, and his Prop Optimizer Pro will spit out the blade ordinates. You can give it constraints, in your case diameter and airspeed.

http://www.geocities.com/aeroopt/index.html

And if you want to make all four blades identical, I will sell you a very nice propeller duplicator <g>