Here's the dieselized Norvel .074 flying the MiniSport in the winter.

http://video.google.ca/videoplay?doc...30773&hl=en-CA

Yes, the fins were turned down. This was not to compensate for flying in cold weather. This was done long before, in the summer, as I was concerned that the relatively large fin area was forcing the Norvels to run too cool. I now no longer believe that and am satisfied that Norvel got it right the first time. An engine can run too hot but it takes a LOT to make it run too cool. Notice after I dump the plane, that I get a start with the engine covered in snow and definitely cooler than normal. That was a start at idle and the engine came up to temps pretty quick for good acceleration. The same engine, with the enormous fin area, will be flown again, this winter, to drive the cool running concept to the max.

On the super cool start, notice that the starter cup slipped several times. This wasn't because of hydraulic lock but due to oil getting on the rubber. A bit of wiping down of the cup and spinner solved the problem. But this custom made starter WILL stall with no damage to the engine in case of engine lockup.

This video also illustrates the torque and acceleration possible with a dieselized engine. This is an .074 driving a Cox, 8 X 4 grey. On the uplines, even when punching the throttle , the engines just growls into life and doesn't miss a beat. Love that little engine.

The fuel used was the 40/40/20 mix, castor and with Amsoil at 2%. Along with the extra cooling fins, I'll be trying various, low and no ether mixes. Lots of stuff to try in cold weather. Feel sorry for the LA and Florida guys, they just don't know how much fun this is. And at 40 below, we just hunker down in the shop and build,,, or repair, [:@] as the case may be.