1.0.2 engine parameters at different atmospheric pressure values

[Teilnehmer]

I’ve made an empirical research landing a large cargo bay full of rocket engines on Eve at different altitudes and measuring Isp.

Here are my results. (A separate table on the ion engine at low pressure values.)

These data are not quite precise though. It would be better to get the true values out of the cfg files.

What is the correct interpolation formula for the Isp curve?

Edited May 26, 2015 by Teilnehmer

[UmbralRaptor]

Cubic Hermite polynomials. Mind that KSP automagically picks some interesting slopes.

[cybersol]

Cool data. The engines with the highest ratio of thrust at 5 atm over their thrust at 1 atm were:

Mammoth         0.67
Aerospike       0.64
Twin-Boar       0.53
Mainsail        0.52
Thud            0.51
Rapier          0.51

So these should be the first places to look for Eve first stage ascent engines.