On Sat, 27 Mar 2004 15:34:03 -0500, David wrote in message <[EMAIL PROTECTED]>:
> Jim Wilson wrote: > > > Ah ok. From memory (not so good) I thought this was configurable. > > 60 sounds like a good value anyway. Would this make engines appear > > to "start" too quickly? > > There should be a time delay. Pilots talk about starting "on the > second blade" or "on the third blade" for an engine that starts well. > A cold engine, an engine with a weak battery, an engine with aluminum > wiring, an inexperienced pilot, etc. can make the starting last much > longer, possibly five to ten seconds. During that entire time, the > prop is spinning at a constant, slow speed until the engine fires. > Spinning up to, say, 45 RPM and then starting the engine instantly > would not be very realistic, either. > > Depending on the engine, some of the cylinders might not fire at first > -- that can make the engine run rough for a few seconds before they > all catch. ..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. ;-) ..do we model the compression's effect on crank speed fluctuation? -- ..med vennlig hilsen = with Kind Regards from Arnt... ;-) ...with a number of polar bear hunters in his ancestry... Scenarios always come in sets of three: best case, worst case, and just in case. _______________________________________________ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
