how do you make a engine quieter
11-03-2005, 04:14 PM
#2
RE: how do you make a engine quieter
The 2 basic ways are:
1. Change the prop. APC props are quieter than MAS props. The pitch AND shape of the prop have a big influence on noise. Also a stiffer prop will be quieter than a more flexable one. (Compare the difference in flexability between an MAS and APC prop )
2. The muffler. The stock muffler is USUALLY the most quiet, however, if you have access to other mufflers try them. Occasionally you will find a different (or aftermarket ) muffler is quieter than the stock one. (JTec upright/inverted muffler is quieter than a stock muffler on an OS 1.60 FX by about 3 db )
1. Change the prop. APC props are quieter than MAS props. The pitch AND shape of the prop have a big influence on noise. Also a stiffer prop will be quieter than a more flexable one. (Compare the difference in flexability between an MAS and APC prop )
2. The muffler. The stock muffler is USUALLY the most quiet, however, if you have access to other mufflers try them. Occasionally you will find a different (or aftermarket ) muffler is quieter than the stock one. (JTec upright/inverted muffler is quieter than a stock muffler on an OS 1.60 FX by about 3 db )
11-03-2005, 04:47 PM
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RE: how do you make a engine quieter
Hi rcmannnnnnnnn,
I believe you have some very stringent noise regs in the UK. Campy has provided great advice but local solutions to comply may be on hand through your club?
I would only add that if you have to use a restrictive muffler to meet the required db level it is probably better to go to a larger capacity motor rather than trying to endlessly tweak a smaller capacity motor.
Good Luck,
Colin
I believe you have some very stringent noise regs in the UK. Campy has provided great advice but local solutions to comply may be on hand through your club?
I would only add that if you have to use a restrictive muffler to meet the required db level it is probably better to go to a larger capacity motor rather than trying to endlessly tweak a smaller capacity motor.
Good Luck,
Colin
11-03-2005, 05:57 PM
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RE: how do you make a engine quieter
there is a thread allready on this subject that has more ideas from soft mounting the engine to the use of three bladed props etc.
11-04-2005, 08:07 PM
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RE: how do you make a engine quieter
The obvious easy answer is to use a bigger prop to keep the revs down. For example I always use an 11 x 7 Graupner on my Enya40SS or OS40 FP while most people reckon to use a 10 x 6 on a 40.
In UK we are always near someones house so we are more noise conscious.
Is this question from UK or NY NY?
In UK we are always near someones house so we are more noise conscious.
Is this question from UK or NY NY?
