Vivian Meazza wrote: > With these values > > eng-power="1140" eng-rpm="2850" > cruise-power="2850" cruise-rpm="1359" > takeoff-power="1100" takeoff-rpm="1359" > > YASim appears go into a loop and provides no output.
These settings don't make much sense in combination. The "eng" setting is a maximum power (at standard sea level) for the engine without supercharging. In this case, the normally aspirated engine develops 1140 HP at max RPM. The "cruise" numbers are used to fix the propeller's maximum efficiency peak. The propeller you are using wants to sink 2850 HP (more than double max sea level power) at less than half (!) of the engine's max RPM. Even with 4x supercharging (which sounds kinda high to me, but I'm not an expert), that's just not going to work. Are you working from POH numbers for this engine that might be typoed or misinterpreted? The "takeoff" values correspond to the power and RPM developed by the aircraft at max throttle and zero airspeed. It's there because propellers have funny, non-linear behavior in the very low pitch regime (when the blades are partially stalled). The default model produces strange results here, so the FDM allows you specify a clamp to match real-world behavior. It's not important to the solver, or for in-flight performance. I'll look into the apparent infinite loop behavior. Andy _______________________________________________ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
