For the P-51D model I would like to model the thrust created by the exhaust system. On the real thing this is about 10% of the thrust created by the engine under at least some circumstances. Early tests done with the Spitfire in the late 1930's produced about 70lbs of thrust (about 70HP) and a gain about 10MPH in top speed when the first test set of "Ejector exhausts" were installed. An early spitfire Merlin would have been around 1000HP. Later the NACA tested an improved set of "NACA Ejector exhausts" on a similar spitfire and they got another 6 MPH increase in the top speed. The NACA version was used on most WWII Merlins including the Packard built engines that were used on the P-51B/C/D/H.
Currently JSBSim does not model the thrust created by the exhaust system as far as I can tell. I tried using a set of rockets to model this since it seems to me that this should act like a rocket whose throttle setting is proportional to the relative manifold pressure (IE MP/max MP). But I couldn't get this to work as the rockets would not fire up no matter what I did. Has anyone done something like this? If so could you let me know where I can find the model so I can have a look at it. If not does anyone have any idea how this could be setup? Hal ------------------------------------------------------------------------------ This SF.net email is sponsored by Make an app they can't live without Enter the BlackBerry Developer Challenge http://p.sf.net/sfu/RIM-dev2dev _______________________________________________ Flightgear-devel mailing list Flightgear-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/flightgear-devel
