SPIT MK I/II and over boost

[JtD]

Neither his point nor mine.

Regarding acceleration in a climb, that's TAS you need to look at, the energy of a plane going 600 in vacuum and going 600 in sea level atmosphere is the same, even if IAS in one case is 0 and in the other 600. That energy needs to be accounted for. Flying the plane a a constant IAS will not give you an acceleration free climb.

As an example, the acceleration during a climb at a constant IAS of 360 km/h to 6000m in standard atmosphere will cost you about 400m in altitude, or 7% in average climb rate. At lower speeds, closer to the typical climbing speeds of WW2 aircraft, the loss is less, around 3-4%.