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Re: North American NA 16-15?
Well, I would be interested to see any NA document which refers to the NA16-15 since the books I have read does not mention it even as a project.
With regard to the PZL 50/I my reference is J Cynk who, in the Putnam book, states that initially the performance was very disappointing with a top speed of 442 km/h being reached. However he continues and says that in August 1939 (after the engine had received a larger carburettor intake) it exceeded 500 km/h in level flight.
Cheers
Stig
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