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Re: Help with P-51D-30NA
Not so much less powerful overall but with a different supercharger. (See RR Merlin 61 vs 66) The -7 had a slightly lower full throttle height, giving it better performance at lower altitudes. When the D appeared in the 8th AF a few individuals preferred to retain their B/C because it went faster higher up.
I've not seen any previous reference to a -3 in a P-51D but if you had a spare one I suspect it would fit without problems. As for the manual, perhaps there was some concern that enough -7s would not be available in time for early D production - and perhaps this happened?
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