Speed graphs for Spitfire and Hurricane

[fruitbat]

Originally Posted by Buchon

28mph is a lot of speed, yes, but that´s with Boost.

The performance line posted by B6 is the base performance line, meaning without Boost.

That base performing line B6 posted is 28mph slower at sea level than it should be for a spit running on 87 octane fuel at max power ie 6 1/4 Lbs, there is no 'boost' to add to it with that fuel, let alone the extra 25 mph at sea level that running 100 octane fuel and 12Lbs boost would get you.