On Friday 14 April 2006 04:54 pm, Paul Surgeon wrote: > Question 1 : > ======== > Is there any way to configure the EGT for a JSBSim engine? > > The 737-300 uses a CFM56-3 engine and the stabilized idle EGT should be > approximately 475 degrees Celcius although it can be as high as 650 degrees > Celcius on a hot day in bleed configuration and if it's in a bad condition.
My manual says 360 to 510 degrees. > The idle EGT in FG (with corrected N1 idle speed - 22%) is 378 degrees C > which is 100 degrees Celcius lower than it should be. The turbine model has no way of knowing what a particular engine will display for EGT. It depends not only on the engine's thermodynamics, but also the EGT probe placement. I intended for users to add "offsets and scales" in the instrumentation code to bring the EGT in line with expectations. In fact, I at first considered just reporting EGT as a normalized value, since any value it provides will be wrong anyway. > Question 2 : > ======== > Is there any way to set the N1 and N2 spool rates? > The current spooling rates are not realistic at all. > > If you increase the thrust levers a small bit the N1 and N2 "jump" up too > fast. Looks fine for a "throttle to the firewall" jab but not for small > changes in thrust level settings. At a guess I'd say that the spooling > rates are hardcoded... Wrong. The spooling rates in FGTurbine are a function of the bypass ratio. Increase the bypass ratio to get slower acceleration. > and don't take the thrust level settings into account. This is something I had been meaning to add, making the acceleration rate a function of rpm too, so that the slowest acceleration occurs at the lowest rpms. As it is now the spool-up rate is constant over the entire range of rpms. > Also the N1 and N2 seem to hit a brick wall when they reach their maximum > and minimum. Instead of slowing down as they reach their limits they > suddenly stop at the limits. The brick wall is a feature. Looks right to me. > It would be nice to get this stuff configured as the behaviour looks rather > unsightly ... For some reason I always find myself a bit unenthusiastic about attending to your complaints. I wonder what the reason could be? Dave ------------------------------------------------------- This SF.Net email is sponsored by xPML, a groundbreaking scripting language that extends applications into web and mobile media. Attend the live webcast and join the prime developer group breaking into this new coding territory! http://sel.as-us.falkag.net/sel?cmd=lnk&kid=110944&bid=241720&dat=121642 _______________________________________________ Flightgear-devel mailing list Flightgear-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/flightgear-devel
