On Sunday 18 April 2004 22:46, Vivian Meazza wrote: > Andy Ross wrote: > > Sent: 18 April 2004 19:04 > > To: FlightGear developers discussions > > Subject: Re: [Flightgear-devel] Spitfire & Hurricane manuals > > > > Vivian Meazza wrote: > > > YASim crashes, or perhaps, fails to converge, just by attempting to > > > run with <takeoff-power="1100" takeoff-rpm="1360"> > > > > Crashing and solution failure ought to be easily > > distinguished. :) Maybe the recent logging changes have > > hidden the failure message, I'll take a look. > > > > Try running the command line "YASim" program on your XML > > file. It will give you a solution (and print the report) > > result much faster than a full fgfs invocation. > > > > I'll take a look at the file as soon as I can. > > > > Andy > > Thank you for drawing my attention to that utility. > > Using these values: > > <propeller x="-1.10" y="0" z="0" > radius="1.638" moment="37.15" > mass="2000" > eng-power="1140" eng-rpm="2850" > turbo-mul="4.0" wastegate-mp="28" > cruise-alt="17500" cruise-power="2850" > cruise-speed="308" cruise-rpm="2850" > takeoff-power="1100" takeoff-rpm="2850" > manual-pitch="true" > gear-ratio = "0.477"> > > YASim converges nicely. > > With these values > > <propeller x="-1.10" y="0" z="0" > radius="1.638" moment="37.15" > mass="2000" > eng-power="1140" eng-rpm="2850" > turbo-mul="4.0" wastegate-mp="28" > cruise-alt="17500" cruise-power="2850" > cruise-speed="308" cruise-rpm="1359" > takeoff-power="1100" takeoff-rpm="1359" > manual-pitch="true" > gear-ratio = "0.477"> > > YASim appears go into a loop and provides no output. The only way out is to > shut down Cygwin. > > Vivian
I've experienced similar 'looping' behaviour when trying to get propellers working properly. Don't know why though - never seems to happen with jet aircraft. Just taking a quick look at the propeller definitions above, it looks as though you're specifying the eng-rpm value for the cruise-power entry in both cases (2850) - what happens if you use 1100? (this being the same value you use for the takeoff-power - the takeoff-rpm and the cruise-rpm match in the definition) LeeE _______________________________________________ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
