Started by Bigtradioman, November 06, 2011, 14:44:53 pm
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Quote from: Bigtradioman on November 06, 2011, 14:44:53 pmI tried soft engine mounts and found that with big petrol's it is generally a lot of effort and expense with very little reward. The engine power output is greatly reduced and in my experience starting the engine can be harder unless you have an Easy Start system or a good electronic ignition.
Quote from: Thommo on February 13, 2012, 09:57:07 amTim, I've read all 3 parts of your thread and there's some interesting facts I didn't know about silencing, many thx.However I'm puzzled by the above statements that power is reduced and starting is difficult? I've used soft mounts and consider them to be essential, especially on modern ARTF airframes as these are so light and fragile that the vibration can literally shake the airframe to pieces. Secondly these ARTF airframes lack any mass to absorb the vibrations (unlike plan/kit built models with solid balsa construction, foam wings etc) and hence act as resonators to amplify the noise. The use of soft mounts is of course de rigeur in F3A.Paul.ps. do you know what the formula is for converting from 2 blade to 3 blade prop?
Quote from: The Doc on April 11, 2012, 09:14:55 amThe problem is that a 22x12 is not going to perform like a 23x8?I have had a very different experience to reducing noise than you seem to have... I find that with DL, DLE and 3W that the prop (within reason) has very little effect on the noise of the model. It is the exhaust that has by far the most effect in my experience. The stock exhausts with the above engines are earsplitting ~90dBA at 7m. Fitting an ALUMINIUM header and canister along with a carb intake filter have brought the noise down to ~80-82dBa and still allowed me to fly my 23x8 mejzliks.I agree the carbon fiber pipe you refer to is not a quiet option!http://www.rcmf.co.uk/4um/index.php?action=dlattach;topic=87378.0;attach=113572;imageCM
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