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?