Just did a quick test, 17000ft with boost and 50% rads
Spit 1 270mph
Spit 1a 240mph
Spit 1a 100oct 240mph (blown engine)
Spit 11a 225mph
Hurri DH5-20 255mph
Hurri mk1 100oct 220mph (blown engine)
Hurri Rotol 245mph
conclusion :- 2 speed prop is faster on both types, 100oct is fragile,
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