Lighter than other models lol
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Interesting, that’s good to know. So with that knowledge, even the 426 km/h with the test bed might be far off from the true maximum the improperly set engine could allow
The 239 weighed about 2,550 kg in its initial configuration fully loaded, or about 110 kg more than the F2A-1 in its original configuration. Modifications the Finns made to the aircraft in 1940-42 increased the weight further by another 90-110 kg, to around 2,640-2,660 kg fully loaded. The power-to-weight ratio was about the same as on the other models, or worse.
A factory-new 239 could push around 495 kmh in level flight at max. power at c. 5,200 m. With a properly set new M-63 with sufficiently high-octane fuel (94-95) the plane could’ve probably done around 520 kmh at a similar altitude.
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Suggestion passed to the developers for consideration. o7