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This is probably an easy question for anyone who deals with acoustics regularly.. I'm trying to estimate the amount of power required to drive a speaker(s) which will produce 80dBA at 7 meters - radiating in every direction. Seems easy enough to calculate the acoustic power from a point source...

I have just started design of an injection molded intake system for a small Yanmar diesel (L48, 211cc, 4 stroke, 4.7hp, 3600rpm). The main goal of this intake is noise reduction, secondary is light weight. I would like to start by choosing a filter, then I'll design around that. Anyone have...

I know it's been a while, but this part of the project has just started up again. John - I'd like to answer your questions and get your advise on a basic approach. The engine will be running at either 2800rpm or 3600rpm (there are two different speed alternators it powers). Again it is...

I am working on a weight/noise reduction contract for a small military generator. I am trying to investigate methods of reducing intake noise and was wondering if anyone has any experience they can share on the subject. I've seen one type of intake silencer using a tubular silencing technique...

Being a rider myself, I actually thought of this. Here are the differences between a motorcycle starter and one I need - 12V vs 24V, motorcycles use always engaged starter clutches whereas this is a solenoid. But I think I will do some research to find what companies make starter motors for...

I'm working on a weight reduction contract for a military generator set. I'd like to replace the current 8.5lb starter with one of about half the weight. I've seen lots of planetary gear reduction starters for cars (racing V8s mainly) which weight down to about 8lbs. I just need to start a...

I'm working on a weight reduction contract for a 2kW military generator. The generator uses a 4.7hp Yanmar Diesel (211cc single, air cooled). This engine has an electric starter on it (although it is almost never used, they like the option). I believe this starter is overkill because they also...