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[Das Attorney]

Originally Posted by Jugdriver

A Spit II would be over 6000 Lbs. The numbers I quoted in my previous post are for a +9LBS boosted Spit II. I think the FM for the Spit II might be a bit confused.. IMO the Spit I and Hurr I in the game are modeled with the +6 ¼LBS boost in mind and the Spit II is modeled with the + 12LBS Boost and 100 octane fuel. Combine that with some favorable numbers and a (little) less than historical performance in the 109 E and there is a significant gap in the performance of the two planes and how they should be modeled. One thing to keep in mind though, even if these aircraft are modeled correctly the Spit II +12LBS will be a deadly opponent for a 109 E 1, 3, 4.

The Mark I and Ia are modelled up to 6.25 lbs/sq in. Boost is 6.252 lbs/sq in. Yes, that's an increase of 0.02 lbs/sq in when boost is engaged.

Check the MerlinIII entry in the engine.fmd file:

Supercharger SingleStageSupercharger Efficiency 0.5 LimiterInput Manifold NominalPressure +6.25 lbsqin ContinuousPressure +4.5 lbsqin WEPPressure +6.252 lbsqin NominalAltitude 16250 feet
Valvetrain Generic SlowRunningEfficiency 0.9
FuelPump Pushrod NominalPressure 9 lbsqin at 500 RPM
Carburettor RollsRoyceFloat DiffuserBore 6.1 cm OrificeSlowFast 1.0 sec Heater AutoEngineOil Altimetric DensityRatio Dresser BoostDriven Input +4.5 lbsqin to +6.25 lbsqin Output 1.0 to 1.01

The Spit IIa has +9 lbs/sq in boost.

From the MerlinXII entry:

Supercharger SingleStageSupercharger Efficiency 0.5 LimiterInput Manifold NominalPressure +6.25 lbsqin ContinuousPressure +4.5 lbsqin WEPPressure +9.0 lbsqin NominalAltitude 13500 feet
Valvetrain Generic SlowRunningEfficiency 0.9
FuelPump Pushrod NominalPressure 9 lbsqin at 500 RPM
Carburettor RollsRoyceFloat DiffuserBore 6.1 cm OrificeSlowFast 1.0 sec Heater AutoEngineOil Altimetric DensityRatio Dresser BoostDriven Input +4.5 lbsqin to +6.25 lbsqin Output 1.0 to 1.01

Spit I/Ia is way too slow, Me109 should be faster, and Spit IIa is much too fast. I modded in a +12lbs/sq in boost Spitfire IIa and it's totally insane. I'd like to see stuff like that in the game properly, but only if they sort out the existing planes first.