Quote:
Originally Posted by aerohead
I believe that it was the P-51 Mustang which has been reported on with respect to heated, air, coming off the oil cooler producing some thrust.
This couldn't work on a subsonic automobile, as it requires compressibility effects of transonic, or supersonic flow to be present.
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Not entirely correct. I have long lost the issue, but an article in Racecar Engineering demonstrated this effect in wind tunnel testing for F1 cars. It was very small, but I suppose it could mean the difference between running out of fuel 100 feet before the finish line vs. at the line. For road cars, such gains are statistically very likely impossibly insignificant nonetheless.