Manifold pressure limits on fixed pitch Merlins
Does anyone know how the pilots of early Hurricanes and Spitfires fitted with fixed pitch propellers avoided 'over boost' (detonation from too higher MP at too low RPM) at for instance, take-off? They seem to have quite coarse pitch, and I assume one could not just firewall the throttle as the RPM would be so low. Or could you? Seeing as the supercharger is RPM dependant.