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A power standard.
Hello Mik:
I don't have the data at hand, The RAF4 developed 140 hp,at 1800 rpm, but the RAF4A was rated at 150 hp at 1600? rpm. It produced 170 hp at 1800 rpm.
Off hand I don't know what the rpm standard was used by the Royal Aircraft Factory. For example all German rotary egines were rated at 1200 rpm and other in-line or V type engines were rated at 1400 rpm. This is not necessarily the enginges maximum rpm or hp. For example the BMWIIIa was rated at 185 Ps at 1400rpm, but at 1600rpm it produced 260Ps.
Too many authors do not do sufficient research, the RAF4A was a RAF 4 with the fly wheel and fan removed in addition to other improvement to the engine to develope more power.
Blue skies Mik,
Dan-San
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