[NSRCA-discussion] Cooling outrunners

[Chad Northeast]

I have played with doing just this, Great Planes makes a plastic cone 
spinner and aluminum backplate for $10 that makes it easy to experiment.

Within the variables of our tests we could determine no significant 
decrease in motor temperature.  Prop and spinner backplate I believe 
while rotating are too restrictive to the flow.

Running without a spinner however has a serious impact in temperatures.

Proper ducting from chin/cheeks into the engine bay can work more than 
well enough to keep the motor at a good temperature.

Chad

J.Oddino wrote:
> It would seem the best way to cool outrunners that have holes in the 
> case on the end that faces the nose ring, would be to bring air in 
> through the spinner and through holes in the backplate.  Wondering if 
> anyone has really thought about the optimum design.  I can picture 
> internal vanes but perhaps cutting off the nose of the spinner and 
> leaving a big hole would be adequate.  Anyone tried anything like this?
>  
> Jim O
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