Modelling > 1920s/1930s GB or Between the Wars GB

A Canadian Raven in Spain

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apophenia:
Yes, a decade's development and no production is pretty damning. The overheating of the Alfa Romeo 135 has me wondering more generally about other twin-row radials. The G-R 14K/14N series had a reputation for running hot (as did the 14M Mars. Overheating was even worse for the BMW 801s.

But then there's the R-1830. Other than the XF4F-2 with a spinner, [1] I don't recall reading about any overheating problems for Pratts in conventional cowlings. But, weirdly, the CAC Cicada single-row derivative seems to suffer from overheating before being derated.
-- http://www.enginehistory.org/Piston/CAC/cac.shtml

This is drifting well off topic but I'm also puzzled but comparative overheating of single-row radials. The single-row Wright R-1820 had a worse reputation for overheating than the twin-row Pratt (supposedly, one of the reasons why the Finns re-engined some of their Wright-engined Hawks). And, weirdly, the CAC Cicada single-row R-1830 derivative seems to have suffered from overheating before being derated.

-- http://www.enginehistory.org/Piston/CAC/cac.shtml

Did Twin Wasps tend to be provided with extra-generous cowlings? Did Pratt have some other trick that somehow didn't get passed on to the Cicada?

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[1] Like much in life, this too befuddles me. Why did having a spinner overheat the R-1830 when the roughly equivalent Sakae seemed to suffer no ill effects from having a spinner fitted?

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