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Thanks for the info. Too bad Italians did not started with 30-32 liters for the Delta, instead of 27.
Could someone shed some light about the DH Gipsy Twelve it's supercharger - Wiki states the take off power with 0 lbs boost (I presume +0 lbs boost?). Was the supercharger only in the function of making the air-fuel mixture a more uniform there?
Lumsden has the Gipsy Twelve as takeoff power as 505hp @ 2600rpm, +3.5psi boost. Max power is given as 425hp @ 2450rpm, 7250ft, +0psi boost. That is the supercharger is providing enough boost to compensate for the altitude, and thus is essentially unsupercharged.