We are not the only people having trouble cooling
a water cooled air craft engine. Here is a picture
of this years version of the Orenda powered duster.
They added a bunch of large exhaust louvers on both sides of the
cowl and extended the duct under the engine right up
to the back of the prop.

BTW my prediction is Orenda will go bankrupt within five
years and stiff the Canadian tax payers for 35 million bucks
that they have put up so far. Who wants a 1000 pound 
firewall forward engine to replace a 500 pound PT6 or 
a Czech copy of the PT6? There is no way they can sell
enough of those $150,000 US firewall forward packages
to net enough gross profit to recover and pay back 
that 35 million.

They may have sold five so far.

Paul Lamar
 
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