Though target drones have long been used by the military, in earlier years, they were far from being the sophisticated fliers we have today. It seems, sometime in WWII, Vincent tried to get a government contract supplying motors for the ML Aviation U120D target drone. The years involved are unclear because all references I found are a bit vague. The motor had to be capable of passing prolonged full power operation tests. This was called the Picador project. The Vincent motor was upgraded with a better crankshaft, Scintilla magneto, double speed oil pump and fuel injection. They did not get a contract.
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