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Old 02-13-2020, 11:08 AM   #41
david.harrison
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Re: Recommend a Sound System for Electric Plane


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Originally Posted by lazyace View Post
This is my digital sound meter and the system produced the sound as advertised on the ground with the speakers pointing down and the sound reflecting off the ground. Even better off of something hard like concrete. In the air for some reason perhaps the frequency and the speakers being directional the sound did not come close to anything like a gas motor doing a flyby. At best it was more in the realm of a 40 to 60 size nitro with a good muffler. Even my YS 1.20 produces a more pleasing volume in my 76 inch biplane. Clevis I too have flown gas for years not only was I looking forward to hearing the real engine sounds but the machine guns and other sounds the unit was capable of. However even with 6S lipos I think you will find the volume doesn't have the presence you will be expecting. It is what it is, the system is only capable of so much nice for a smaller model not so much for an 80 inch plus model. If you get one let us know if you think the sound is a match for larger models.

Dennis
There are very practical limits to what can be achieved for SPL (Sound Pressure Level) in flying model aircraft. You are up against the laws of physics and laws of diminishing returns.

Please see this article I wrote last year on my web site about those limits:
http://www.modelsoundsinc.com/articl...undSystems.pdf

RC Modellers thinking about using any RC sound system from ANY manufacturer, not just Model Sounds Inc., have to tame their expectations and align them with what is practically achievable using the best of today's technology for loudspeakers, amplifiers and batteries. If you had unlimited payload capacity for much larger and more sensitive loudspeakers, more powerful amplifiers and much larger batteries, then it would be possible to theoretically get up to about 120dB, but who wants to carry a 1000Watt amplifier, speakers and batteries in their model airplanes?
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Old 02-15-2020, 10:09 AM   #42
Clevis
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Re: Recommend a Sound System for Electric Plane

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Originally Posted by david.harrison View Post
The sound level, measured at 1m from the speakers is way above that. I personally measured 107dB with an F15 jet engine sound and 106dB with a Spitfire Merlin engine sound. This was with the sound module powered on a 6S LiPo.
Using using your F15 jet sound as an example, what would your db readings be if it was measured 3 meters from the speakers?
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Old 02-15-2020, 10:12 AM   #43
Clevis
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Re: Recommend a Sound System for Electric Plane

Thanks for your input. If I do get one, I'll post my impressions.
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Old 02-15-2020, 10:32 AM   #44
stegl
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Re: Recommend a Sound System for Electric Plane

Have heard Model Sounds system a few years ago and it is good , complete with machine guns. As mentioned, you get what you pay for and you get , in Canada, support. Not, throw it away ,when it quits working.

Having said that, a good system will never replace the actual throaty sound of a real full size aircraft. As for jets , I haven't heard any sound system yet to compare , only the real thing.
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Old 02-15-2020, 11:07 AM   #45
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Re: Recommend a Sound System for Electric Plane

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Originally Posted by stegl View Post
in Canada, support. Not, throw it away ,when it quits working.
Not so when mine quit I was told they don't repair them I would have to buy new.

Dennis
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Old 02-15-2020, 03:12 PM   #46
david.harrison
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Re: Recommend a Sound System for Electric Plane

Quote:
Originally Posted by Clevis View Post
Using using your F15 jet sound as an example, what would your db readings be if it was measured 3 meters from the speakers?
At 3m it would be 97dB.

Just to keep things in perspective here, I'd like to relate some SPL measurements I did at Vintage Wings of Canada. I was fortunate enough to be able to attend an engine run up on their Hawker Hurricane which has a Rolls Royce Merlin V12 engine. It has a wingspan of 40ft and I was able to stand at the wingtip while I was making my recording at that position, some 20ft (6m) away from the engine. At that distance I measured 96dB SPL. Taking into account it was 6m away and not the 1m that is used as an industry standard for loudspeaker SPL 's, that equates to an SPL of 111dB at 1m distance. So our sound system SPL of 107db at 1m is only 4dB short of the real Hurricane airplane engine - not too shabby, I would say.

The problem with distance is that SPL suffers from an inverse square law - i.e. if you double the distance, you lower the SPL to 1/4 or 6dB, not half or 3dB. So for example, at 10 times the distance, you lower the SPL by 20dB. This is a basic law of physics which you cannot get round and it applies to real airplanes and helicopters as well as model ones. An interesting and easy to use calculator for this is here : https://www.omnicalculator.com/physi...ce-attenuation

I hope this helps all your understanding.

Last edited by david.harrison; 02-16-2020 at 01:40 PM.
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