Adding an auxiliary electric motor might be fun... - Page 2 - SailNet Community
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post #11 of 23 Old 07-09-2014
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Re: Adding an auxiliary electric motor might be fun...

Don't know, but used as intended by MedSailor..a 160 lb. thrust with the right prop
could deliver the desired 2 h.p. ...depending on who's formula/math you use.
Seems motorsailing at rather low rpms (thrust), provides a synergy beyond
the math.
Maybe worth a look at website if nothing else.
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post #12 of 23 Old 07-09-2014 Thread Starter
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Re: Adding an auxiliary electric motor might be fun...

HugoSalt

While I doubt a trolling motor would do me much good, I really DO appreciate the suggestion. I just procured a large sized Torqueedo outboard, and your idea gave me the idea that I should try stern mounting the Torqueedo and see what it does. It's quite a bit more thrust than a trolling motor, and would be easy to implement. Even if it doesn't do what I desire, I could use the thrust specs to help guesstimate how big of an internal electric motor setup I will need.

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post #13 of 23 Old 07-09-2014
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Re: Adding an auxiliary electric motor might be fun...

Chains and sprockets are inherently noisy. This is why so many cars went to "rubber" timing belts instead of metal timing chains.

And who needs a clutch? When you are not driving the electric motor, isn't it a DC generator that can be left attached, charging your batteries, heating your water, doing other useful work?
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post #14 of 23 Old 07-09-2014 Thread Starter
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Re: Adding an auxiliary electric motor might be fun...

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Originally Posted by hellosailor View Post
Chains and sprockets are inherently noisy. This is why so many cars went to "rubber" timing belts instead of metal timing chains.

And who needs a clutch? When you are not driving the electric motor, isn't it a DC generator that can be left attached, charging your batteries, heating your water, doing other useful work?

An interesting thought about chain noise. I can't imagine it would be that bad... I once went to an electric boat talk and the guy giving the presentation said his company used supercharger belts. Said they were immensely strong. I could use those, I suppose but the parts seem less easily available.

I could leave it attached, but then I'd need to make sure it was adequately cooled, could handle the max RPM of the motor for long periods and would have to regulate the charging current. I'm sure my 90HP engine has a few extra HP to give up, so the draw on the engine shouldn't be a problem. Not impossible to set up this way at all, but simple is part of what I'm after.

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post #15 of 23 Old 07-09-2014
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Re: Adding an auxiliary electric motor might be fun...

simple is slap on a dc motor on the shaft with sprockets to use as an alternator....since its dc volts go back in when you want to use it as a silent dc motor...all electric.

chain and sprockets make no more noise than the mosy silent diesel engine...so that nonsense doesnt pan out....

lube...clean and do like you would a bike chain

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post #16 of 23 Old 07-09-2014
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Re: Adding an auxiliary electric motor might be fun...

Problem with chain drive is it's on all the time unless you've got a clutch on the shaft itself. Possible but I've never seen a suitable critter. One could make something up using the syncro slider like a dog clutch from a truck trannie but that gets more complicated.The belt drive doesn't touch the shaft when slack and idler operated by a lever, wedge or remotely turned screw .When the shaft is electrically engaged the transmission is turning (oil cooling etc)so this is not a stand alone gizmo for long. Also the side pull of the belts on the shaft is considerable and can bend a toy . I put on a Maxi and never looked back.
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post #17 of 23 Old 07-09-2014 Thread Starter
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Why is chain on all the time? The way I'm picturing this it's no different than belts but eliminates the side loading issue. What about watermaker and engine refrigerator clutches? Couldn't I use whatever they use but with chain?

Btw what do you mean by "I put on a maxi". I can only think of one meaning for that and I'm quite sure it isn't what you meant.

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post #18 of 23 Old 07-10-2014
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Re: Adding an auxiliary electric motor might be fun...

Instead of chain use a cog belt sometimes called timing belts, as to clutches, just let it spin, unless you have a huge gear reduction there will be little drag,
Best would be if you could find a double shaft motor that runs the same speed, rpm, as the shaft, and you have the clearance from gearbox to seal to fit it. think WarP motor.
I'd like to do this mostly to power on/off dock, mooring, for 2-5 minutes without starting the diesel, and could also use it as a big alternator
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post #19 of 23 Old 07-10-2014
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Re: Adding an auxiliary electric motor might be fun...

Len ment Max-Prop
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Re: Adding an auxiliary electric motor might be fun...

D3, Depends on your needs but that makes me feel better
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