..these parameters can be set in a config file? Slowest cranking I saw start LN-AEB (a 60'ies PA28-140 with the standard 4-banger and quite likely a ditto vintage battery) was a blade every 5 seconds.
It was usually a blade every 2 to 3 seconds. Facinating. ;-)
So Arnt is suggesting a typical cranking speed of 10-15 rpm, vs. my wild guess of 30 rpm. Neither one is blindingly fast. His worst case example was 6 rpm.
I'll mention again that once the engine fires, the jump to normal RPM is pretty-much instantaneous -- there's no gradual spin-up over a few of seconds.
..do we model the compression's effect on crank speed fluctuation?
We're a long way from anything like that. Right now, it's basically just a fancy animation. If we wanted to model engine starts properly, we'd have to model each cylinder individually. That would also allow the engine to (possibly) run rough when leaned, based on different air/fuel distribution to different cylinders, etc. (at least until we installed virtual GAMIjectors on the fuel-injected engines). We could also model fouled plugs -- that would encourage fgfs users to do a proper runup before every flight.
All the best,
David
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