Duffy Electric boats....?

You could wire 4 in series and 2 in parallel and get 24 volts or 3+3 in parallel and series between them and get 12 volts. Typo

I have two speeds on my switch. Slow and fast. Is the motor using 24 volts for slow and 36 for fast? Im just trying to figure out if my wiring is correct. Its working so Im guessing its correct although not efficient.

Here she is in all her glory

Wire brush all the connections, a small brass wire brush on a dremel works great. Then spray them all down with Corrossion Block.....or the Deka battery terminal spray is excellent also and like $5 a 12 ounce spray can.

Great thanks!

You can see the 36Vdc config. Looks like 12Vdc taps from the top and bottom 12.

At long last the clouds have parted, the sun is shinng and all is well on the Duffy !! What a diferance 2 new pulleys and a new belt make. One question for you however about belt tention. I got real fimilar with belt tention using the old worn, glazed belt. With my new belt it " feels " right....a little give when you push on it with your finger....doesn't bounce or flop when under way...not too much tention on the shaft, bearing heat etc. Only the amount of belt dust you'd expect for a new belt. BUT...I'll get squeal when backing into a strong current along with a strong wind but this is only at 100% trottle. Or tied up to the dock a bit of squeal in forward at W.O.T. No squeal at W.O.T. out and about, only with the resistance of the dock. I tightened the belt to the point where it felt on the verge of being too tight and still squeal in those to extreme conditions. I put the tention between the two positions and am thinking all is fine in the Duffy world and I just need to forget it....whats your expierance been ?
Todd

I am so embarrassed ! It's not the belts but rather the dripless shaft seal I installed.I forgot about the water trick so today I let it squael and strayed water on the belt...NO CHANGE IN NOISE TONE AT ALL !! Its a cavatation/ water flow thing at those extreme conditions, even with the vent tube I installed. I have a big zinc right near the stern tube behind the prop. Where the carbon seals against the rotor there needs to be good water or they make a high pitched squael....sounds just like a belt !
Thanks for responding...any buyers yet ?
Todd

Correction !! Today I " burbed " the shaft seal while running to confirm that was the squael, I took the shaft seal out of the equation completely for a moment.....still had the squael ? I lifted the back seat and started to listen and behold its coming from the cutlass bearing area under water. I think I've really found it at last!

May be " prop sing " as a while back I filed the plastic prop thinking a sharper edge was better? Sure would explain why I get the noise in the water but not in the driveway !

Could also be cutlass bearing if your shaft is not aligned. In a boat with an internal combustion motor, you'd probably never even hear it. Some electric motors make noise as well when they've got a load on them and it is normal.

Thanks Capt. J , good point! At the moment, for several different reasons, I'm thinking prop however. I need to 1 ) Confirm it DOES NOT do it out of the water which stronly would point to prop (2 ) If so take the prop off and back her in the water ( that will be a sight ) but of course still connected to the trailer. ( 3 ) Rev her up and see if the sound is gone...if so its the prop.
But do you over rev. anything, or hurt anything, if you give her full throttle with no prop ? ( 3 seconds is all I need to tell )

With an electric motor I think it will only turn so many rpms period and not hurt it without a load. Not sure. It could still be the cutlass bearing with the prop off, as with no prop there is no load on the shaft......you might not want to even worry about the noise if it's not that loud as it might be normal.

Or, run her till she stops singing,,, as the old phrase about the fat lady.
You'll know what the problem was/was not then.

You may be just chasing sounds that are there. Charge the batteries, get some luv on board, pour some champagne (rum preferred) and go for some rides.

It's not like your going to fail in the gulf stream. Get er goin....