how do you make a engine quieter
 

how do you make a engine quieter, can any one help?

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 )

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

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.

RE: how do you make a engine quieter
 

thanks

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?

RE: how do you make a engine quieter
 

Shut it off.:D

Sorry, I couldn't resist.

RE: how do you make a engine quieter
 

or hand out ear headheadsets to everyone even the people living in the houses!!!:D:D:D;)