Hi all,
I am currently working on an FM for an early version of the Spitfire Mk.I for CFS3. This version is equipped with a De Havilland two-speed prop (pitch is adjustable, but this is not a constant speed prop). So far I have been able to get it working just fine and all the RPM and MAP gauge readings are falling pretty close to the flight test data I have in all different conditions of flight.
Everything seemed pretty well tuned, but my top speeds were about 30-40mph too slow and my rates of climb were roughly 1,000fpm too low. So I adjusted the thrust_scalar value in the propeller section of the aircraft.cfg up just enough to cancel the the friction loss on the engine in the .air file (this allowed me to avoid completely recalculating my propeller tables). Top speed now fell right in line with the test data (~367mph at 18,600ft at 3,000rpm and 42inhg MAP). However, my rate of climb was now about 1,000fpm too high at all altitudes (this is while conducting the climb in the same manner as described in the test data).
Is there something I can tweak that will drop my rate of climb down without messing too much with top speed? Or is there a better way than using thrust_scalar to adjust top speed and rate of climb?
As a note, this is being done in CFS3, so it uses an FM that falls somewhere between FS2002/CFS2 and FS2004 capabilities, but uses the same basic format as all the MS sims (aircraft.cfgs and .air files look and work pretty much the same).
Thanks for any help!
Daniel
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