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  #1  
Old 11-08-2012, 06:37 PM
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GMS 76 Motor Sound Profile

This two stroke engine sound file has been giving me fits trying to get it to an acceptable level. And Ryan is AWOL from the Motor Sound Profile sticky so I'm not getting any assistance.

Anyway, after about a dozen iterations I think I have it pretty close.

Here is a Fraps video of the engine sound. Disregard the graphical OS engine.

Compare this to the actual GMS 76 in my Four Star 60.

Let me know what you guys think, if it's close enough or not.

GMS 76 RealFLight

In the following video, skip to the 5:00 minute mark:

GMS 76 In AIrplane
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Old 11-08-2012, 10:29 PM
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Wow that is amazingly close.
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Old 11-09-2012, 02:38 AM
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Thanks willsonman!

Ryan just left an amazing post in the Motor Sound Profile sticky thread. His advice is going to help a lot in getting these things to sound more accurate.
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Old 11-09-2012, 02:00 PM
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Sounds close indeed, nice job.
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Old 11-10-2012, 12:19 AM
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Yeah really nice!

I've never had problems with GMS and Tower engines ( made by the same factory ), except once when I used one in a pusher prop plane...

In this case the engine got too hot and siezed, nothing richening up didn't cure.

Too bad they went out of production.
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Old 11-10-2012, 03:17 AM
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Thanks Jose!

I really like this GMS .76 engine I have. Once it was broken in, it starts easily by hand, idles as long as I want it too, has huge power, and sounds it too when flying.

Well, I searched around for audio tachometers on the web. I found three. One was for desktop use, and two were Android app's.

Ryan stressed in his post that accurate RPM numbers for the sample files will make or break a project.

I found two of the three softwares did not work. The one Android paid app, does work. It's a bit fiddly, and not rock steady, but it gives me something to work with instead of guessing.

So, my guessing was not off all that much. But I re-did the sound profile with the samples renamed to the RPM figures I extrapolated from the audio tachometer. I made another Fraps video, and then played them alternating one after the other at close representative clips. After listening to them several times it did seem like the later version sound profile was a little more accurate, in particular when the engine was being accelerated.

I have added the GMS 76 to the "Simple Flier" model which everyone who owns RealFlight should have a copy of. It will be on the swaps shortly.
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