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I think initial acceleration is roughly proportional to max RoC.
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As Far As I Can Tell Right Now:
As long as you can hold TAS steady, Ps = change in height / change in time.
And there's correction for when you can't that with 10/sec data rate from devicelink should be possible to get closely.
See equation 7.2 on page 14 of this PDF:
http://www.aviation.org.uk/docs/flig...-FTM108/c7.pdf
When change in TAS = 0, the correction factor goes away. A tiny change in TAS at low airspeed will make a small correction necessary.
Ps =dh/dt + VT / g * dVT / dt
where
d is "change in"
h is height
t is time
VT is TAS
g is gravity
dVT being change in TAS, if it is 0 then everything past dh/dt is 0
I have found close to steady IAS climbs to be easier to fly in IL2 than trying to keep level at full power from 200 kph to full speed.
Remember that Ps changes with both speed and alt. Whatever tests are run need to cover as much of the range as you want to chart. You don't have to get speed at every last kph or alt at every meter but the closer you get the smoother/more accurate your connect-the-data-dots curves will be.
That's as good as my NOT-AN-AE-SELF can do right now, the simple things.