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Post by Deleted on Apr 3, 2017 16:01:39 GMT
I was wondering about running an alternator off the tailshaft between gearbox and stern tube.
It would be a large frame Leece Neville 160a 12v alt. the object of it would be to charge batteries for a pair of electric outboards. Domestic power is taken care of by the existing alternator and solar. Charging would only be required when engine is pushing boat along. At other times the electric outboards will be doing that.
Is there a type of pulley which will split and clamp over the shaft (1.5 inch shaft) I would need dual v belts.
All a bit theoretical but it might work !!
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Post by peterboat on Apr 3, 2017 16:24:15 GMT
You would need multi vee or a large toothed belt gearing would have to be 3 to 1 and I have not seen a pulley like you need. I am going the electric route at the moment so looking at this stuff already
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Post by JohnV on Apr 3, 2017 16:38:01 GMT
I have been trying to remember where I have seen split pulleys that clamp around a shaft ......... I am pretty sure one was in a museum or at some show on antique machines ...... I don't think I have seen one in any catalogues ...... Is there no way you can split the shaft and use a standard taperlock ?
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Post by phil70 on Apr 3, 2017 16:40:21 GMT
Have a sniff round the Broads, there must be loads of info to be had as there are loads of electric boats down there and there is an annual Electric Boat Show.
At one time there were very handsome grants available to convert to electric.
Phil
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Post by Deleted on Apr 3, 2017 18:27:16 GMT
I have been trying to remember where I have seen split pulleys that clamp around a shaft ......... I am pretty sure one was in a museum or at some show on antique machines ...... I don't think I have seen one in any catalogues ...... Is there no way you can split the shaft and use a standard taperlock ? Probably could do yes  I had it in my head that there was a split pulley but using a taperlock is clearly the better way. Not sure what I was thinking - been very tired as have been up since 3am.. |
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Post by Deleted on Apr 3, 2017 18:37:22 GMT
You would need multi vee or a large toothed belt gearing would have to be 3 to 1 and I have not seen a pulley like you need. I am going the electric route at the moment so looking at this stuff already Dual vee belts will do it polyvee are a bit awkward to find pulleys for and I'm not convinced a cambelt would be suitable for an alternator. I'm looking at using a couple of large Minn Kota 24 or 36v trolling motor pods for electric propulsion. The big 4 inch diameter ones have some serious punch I have one (an old Genesis 24v from the USA) and it happily moves the boat. Very slowly but it goes. They are not expensive. This way of doing electric propulsion means that when running the diesel for propulsion it would be ideal to have a high power alternator putting charge in efficiently which is why I considered the propshaft option. The engine would never run in neutral as it would be turned off and electric used for around locks etc. Propshaft is half engine speed so would need a fair sized pulley. I suppose pulling several HP might put too much side load on the stern tube. |
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Post by faffer on Apr 3, 2017 18:38:00 GMT
Depending on the size of pulley you could get one and take it to a laser/jet company to cut it as they give a very narrow cut and get it drilled for bolts. Few tabs or a full ring/lip welded either side to keep it square once bolted together. Just an idea. I googled and found some split ones but from overseas. I`ll keep looking though. forgot to give this link, they could help out or know somebody, i jave used them in the past and are helpfull. www.bearingboys.co.uk/V--Wedge-Pulleys-1038-c |
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Post by Deleted on Apr 3, 2017 18:50:20 GMT
Depending on the size of pulley you could get one and take it to a laser/jet company to cut it as they give a very narrow cut and get it drilled for bolts. Few tabs or a full ring/lip welded either side to keep it square once bolted together. Just an idea. I googled and found some split ones but from overseas. I`ll keep looking though. forgot to give this link, they could help out or know somebody, i jave used them in the past and are helpfull. www.bearingboys.co.uk/V--Wedge-Pulleys-1038-cThey are the type MM wants. MM, split the shaft coupling you lazy bugger! |
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Post by faffer on Apr 3, 2017 18:58:59 GMT
Depending on the size of pulley you could get one and take it to a laser/jet company to cut it as they give a very narrow cut and get it drilled for bolts. Few tabs or a full ring/lip welded either side to keep it square once bolted together. Just an idea. I googled and found some split ones but from overseas. I`ll keep looking though. forgot to give this link, they could help out or know somebody, i jave used them in the past and are helpfull. www.bearingboys.co.uk/V--Wedge-Pulleys-1038-cThey are the type MM wants. MM, split the shaft coupling you lazy bugger! Would the pulley go over the shaft UJ or what ever is there, rim or weld run etc once it has been split. |
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Post by Deleted on Apr 3, 2017 19:03:30 GMT
Will have to have a look at the gearbox output coupling. Its straight out the back no universal joint or anything. Not sure whether the coupling on the tailshaft is keyed or maybe it has a pin.
Will have a look. I still like the idea of a split pulley.
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Post by Deleted on Apr 3, 2017 19:13:30 GMT
Will have to have a look at the gearbox output coupling. Its straight out the back no universal joint or anything. Not sure whether the coupling on the tailshaft is keyed or maybe it has a pin. Will have a look. I still like the idea of a split pulley. If there's no UJ it will be either a split clamp or a taper with a key and a gert big nut to pull it up on. If you go that route and need a puller making give me a yell. The trouble with a split pulley is it needs to be an accurate (read expensive) bit of kit so as not to munch the belt. You will only do the fitting work once so the faff of pulling the coupling off hands down beats the cost of a hard to obtain split pulley. |
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Post by JohnV on Apr 3, 2017 19:40:26 GMT
Don't forget that if you have a split pulley ....... you will need a splittable belt !!!
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Post by Deleted on Apr 3, 2017 19:47:02 GMT
Don't forget that if you have a split pulley ....... you will need a splittable belt !!! That's true! Those link belts belong on farms A good way round that problem is to cable tie some spare belts in place so as to make life easier. |
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Post by peterboat on Apr 3, 2017 23:34:39 GMT
You would be better of going the Hybrid route and using the electric motor as the generator for the batteries when in diesel mode, less hassle only one prop and its simpler by far honest you are going a long way round a simple issue
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Post by faffer on Apr 4, 2017 2:29:03 GMT
Don't forget that if you have a split pulley ....... you will need a splittable belt !!! That's true! Those link belts belong on farms A good way round that problem is to cable tie some spare belts in place so as to make life easier. Be like the good owd days and MM can use his stockings and always a spare pair to hand then  |
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I had it in my head that there was a split pulley but using a taperlock is clearly the better way. Not sure what I was thinking - been very tired as have been up since 3am.. 
