Spit IIa is now so much more inferior to the 109

[NZtyphoon]

Originally Posted by Crumpp

It also shows maximum boost at emergency power at 12,500ft as +10.55lbs at 3000 rpm for the Merlin III when you use boost override or pull the tit on 87 Octane.

Absolutely NOTHING to do with the use of 100 Octane fuel.

Actually the modifications to the boost control cut out had not yet been instigated in June 1939; the modifications to the boost control cut-out were needed before the engine could reach +12 lbs boost. This is full power test proving that the engine was strong enough to withstand high boost pressures, and that relatively high pressures could be achieved on 87 Octane fuel. Once again this is a pre-war document which proves nothing germain to Crumpp's "case".

http://www.wwiiaircraftperformance.org/ap1590b.jpg

http://www.wwiiaircraftperformance.o...ol-cut-out.jpg