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Odd Engine Flat Plateau Issue

lionheart

lionheart

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us-arizona
Hey all,

I have a very odd sound problem from my high end number four engine sound. It seems to hang from 50% throttle to full throttle, all being one sound tone/pitch. Then from 49& to 0 its back to normal tones, from high to low.

What this means is that from 50% throttle, through 75% throttle, through to 100% throttle, its the exact same sound. You can back off from full throttle and watch the Tach slowing down, but the sound stays the same.

The prop is a Fixed Pitch.

I have gone through the airfiles trying to figure out what in the world could be causing this and havent found a single thing. I have tried messing with the Pitch Beta for the fixed pitch blades setting. I looked all through the Air file. Nothing.. The airfile templates are from the Piper Cub stock aircraft, modified to a faster aircraft with higher cubic inches per cylinder to bring the aircraft up to speed.

Any idea's on what could be causing this oddity? I would be very greatful for any idea's or input or guesses.



Bill
 
Hi All:

See also the thread at:

http://www.sim-outhouse.com/sohforums/showthread.php?t=20295


It appears Bill has resolved his question in regards to this interesting aspect of the FS sound.cfg and aircraft.cfg file interaction when configuring FS engine sounds.


Perhaps as more is discovered about this arcane topic, we might see a WIKI on this here at FSDeveloper? :idea:


Thanks for bringing this to light, Bill! :)

GaryGB
 
Hey Gary,

I was most greatful to have the fix presented.

As it turns out, the culprit was 'hp' rating. I had it set to 65 HP, and as it turned out, FS uses the HP rating for the peak zone of the sound config. It must interact with another equasion, such as total cubic inches from the cylinders, as I had adjusted that only, which caused the issue with the sound config. Raising the HP rating (which doesnt change speed or engine output) caused the sound file to function once again, going from zero to 100% smoothly.

This has been an issue for me on past projects. Its good to finally at least know basically how to get around this...



Bill
 
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