FWIW, here are my comments on the recent `Torqeedo noise'; complaint. Disclaimer, I do sell Torqeedo's (and Parsun, Ray, DualPro, ElectraCraft, and others certainly) but I also USE all of these products which (for these purposes) is perhaps much more important than selling them.
Anyway, The original Torqeedo planetary gears did make some noise. Those are the TRAVEL 401/801 and Old Cruise 2.0 Tiller models. Many changes have been made, and the new Travel 1003/503, Cruise 2.0/4.0Remote and 2.0 Tiller have much, much quieter gears. It's the incremental improvements being added to the entire lineup and it really is a big change. If you have heard an `old' motor you really need to hear a `new' one to appreciate the difference. My assessment is that the noise is not objectionable, by my terms nor any of my passengers.
Brushed air-cooled motors make their own unique noise, as do brushless DC, belt drives, gear drives, and chain drives. As previously said by another poster the only thing truly silent motor is the submerged old-school trolling motors; but they don't have enough power to do what most of us need to do. Anything spinning pretty much makes some kind of noise.
BTW: If anyone happens to be in the West Palm Beach FL area please do come by the boat show and say hello! I'll be there thru Sunday.
Capt. Todd
www.epowermarine.
--- In electricboats@
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> My $0.02 on noise: Anything moving makes noise, spinning things make noise, especially if they are a little bit out of balance (i.e. real world spinning things). Prop blades create a pressure wave that can make a little vibration in the hull as the tip goes past. The brushes scraping over the commutator gaps makes noise in a DC motor. Gears especially make noise. Lets keep electric drive noise in perspective - exploding fuel REALLY makes a lot of noise.
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> The smaller Torqeedo's have a double planetary transmission needed to reduce the high speed of a small brushless outrunner motor low enough to drive a big efficient prop. (that's the secret of their high efficiency). You can hear the gear whine on youTube videos. I understand the new larger 2.0 and 4.0 models are significantly quieter but have not heard one run myself. Maybe Cap'n Todd has a comment?
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> The quietest drive I know of is an old fashioned trolling motor. All the moving parts are under water, the motor is small and there are no gears as they are direct drive.
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> Denny
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