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My dad bought a Willys 6 sedan new in 1931 and even in the 50's people still would ask him if it was a Willys-Knight (with sleeve-valve engine). His had a Continental Red Seal engine IIRC, but many Willys cars had the Knight engine, at extra cost. There was also a Stearns-Knight car and there may have been other makes that used the Knight engine.
The main advantage of these engines was that they were very quiet. Not sure why they would have been so great in aircraft though.
Ray Mac.
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