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Very intersting thread, as much as I lurk, I wonder how I never found it.
the engine is a huge part of what the efficiency is. I did not find specs for the orignal posted plane, but did find it started off with a volkswagen conversion.
I also found an ea82, unrelated, seems a much older story,subaru engine (1781cc) a man did the same flight, west coast to east extremely low fuel consumption- over 200mph. I wondered what the liquid cooled did for homogeny, it is not quibble about carburators, even p51s had a perfect can of whoopass with it upside down and 400 mph.
The 3 main boxer won't be beat in any category of efficient.
I have learned my own little sube on earth exceeds the norm to the point of mythical at 92mph...
given the weight of the plane and modern materials, I wonder if a boxer 2 cyl could get going that fast. one person, superlight.
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