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Post by Deleted on Jul 23, 2017 8:45:24 GMT
I'm considering fitting an inboard motor in my 14ft launch. A diesel would be preferable.
I was thinking of putting a small water cooled diesel engine in (ex generator engine for example) and belt driving a propshaft with an electric clutch pulley (like used on air con pumps). This would give forward and neutral but no reverse. For my purposes thats not a problem.
The boat is currently powered by an electric outboard mounted in an outboard well but this does not give much range - it does give close quarters forward and reverse maneouvering.
Any suggestions for suitable diesel engines or drive configurations, or comments on my belt drive plan?
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Post by bargemast on Jul 23, 2017 10:32:05 GMT
I'm considering fitting an inboard motor in my 14ft launch. A diesel would be preferable. I was thinking of putting a small water cooled diesel engine in (ex generator engine for example) and belt driving a propshaft with an electric clutch pulley (like used on air con pumps). This would give forward and neutral but no reverse. For my purposes thats not a problem. The boat is currently powered by an electric outboard mounted in an outboard well but this does not give much range - it does give close quarters forward and reverse maneouvering. Any suggestions for suitable diesel engines or drive configurations, or comments on my belt drive plan? It would be a lot less hassle, much easier and cheaper too, to replace the electric outboard by a small 4 stroke outboard. Peter. |
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Post by Deleted on Jul 23, 2017 10:59:00 GMT
I've got two four stroke outboards. A 2hp and a 6hp, for the boat as well.
I like the idea of a diesel as I am not keen on sitting in a boat full of petrol and batteries. I want to keep the electric option available.
Mixing petrol and electric in a small boat is too dodgy.
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Post by Deleted on Jul 23, 2017 15:25:12 GMT
I've got two four stroke outboards. A 2hp and a 6hp, for the boat as well. I like the idea of a diesel as I am not keen on sitting in a boat full of petrol and batteries. I want to keep the electric option available. Mixing petrol and electric in a small boat is too dodgy. between my dad and myself We've managed doing just that with a 16'Mayland since 1991... |
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Post by JohnV on Jul 23, 2017 16:10:11 GMT
I'm considering fitting an inboard motor in my 14ft launch. A diesel would be preferable. I was thinking of putting a small water cooled diesel engine in (ex generator engine for example) and belt driving a propshaft with an electric clutch pulley (like used on air con pumps). This would give forward and neutral but no reverse. For my purposes thats not a problem. The boat is currently powered by an electric outboard mounted in an outboard well but this does not give much range - it does give close quarters forward and reverse maneouvering. Any suggestions for suitable diesel engines or drive configurations, or comments on my belt drive plan? |
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Post by Delta9 on Jul 23, 2017 16:20:16 GMT
Stick a Lister in it and make yourself a little opduwer.
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Post by Deleted on Jul 23, 2017 16:59:49 GMT
I've got two four stroke outboards. A 2hp and a 6hp, for the boat as well. I like the idea of a diesel as I am not keen on sitting in a boat full of petrol and batteries. I want to keep the electric option available. Mixing petrol and electric in a small boat is too dodgy. between my dad and myself We've managed doing just that with a 16'Mayland since 1991... Did you have to swap the outboards or have separate mounts? This boat is a double ended grp with an outboard well which only fits one unit so the idea would be to put my elec pod outboard in the well and an inboard in the boat with the prop forward of the outboard prop. Rudder can be mounted behind. The elec outboard could be removed and replaced with a petrol outboard if necessary but for longer journeys (several hours) a diesel is going to be better than a petrol outboard because of the seamless transition from IC to electric and the improved safety of diesel over petrol. Its a bit over the top but I like boats with inboards and I am not willing to clamp an outboard bracket on the stern. |
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Post by Deleted on Jul 23, 2017 17:01:14 GMT
Another approach may be a small diesel generator, batteries and a larger electric outboard.
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Post by Deleted on Jul 23, 2017 17:10:44 GMT
between my dad and myself We've managed doing just that with a 16'Mayland since 1991... Did you have to swap the outboards or have separate mounts? This boat is a double ended grp with an outboard well which only fits one unit so the idea would be to put my elec pod outboard in the well and an inboard in the boat with the prop forward of the outboard prop. Rudder can be mounted behind. The elec outboard could be removed and replaced with a petrol outboard if necessary but for longer journeys (several hours) a diesel is going to be better than a petrol outboard because of the seamless transition from IC to electric and the improved safety of diesel over petrol. Its a bit over the top but I like boats with inboards and I am not willing to clamp an outboard bracket on the stern. I meant mixing petrol and electric, we also have managed to successfully use gas onboard without being blown to kingdom come  |
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Post by Deleted on Jul 23, 2017 17:18:28 GMT
Mixing petrol and electric propulsion you mean or having electrics like lights and instruments on a petrol powered boat?
I'm happy with the latter but the former bothers me as I switch between battery banks for the electric outboard and have a cheap speed controller there is a small risk of sparks.
I've done twin outboards for years on my dinghy with outboards side by side but no room for two on this boat and lifting one off to put the other on is irritating and dangerous (to me).
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Post by Deleted on Jul 23, 2017 17:21:14 GMT
I want to set the boat up as a microcruiser (it has an accommodation cabin) and follow JohnV up the east coast  |
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Post by Deleted on Jul 23, 2017 17:51:13 GMT
Mixing petrol and electric propulsion you mean or having electrics like lights and instruments on a petrol powered boat? I'm happy with the latter but the former bothers me as I switch between battery banks for the electric outboard and have a cheap speed controller there is a small risk of sparks. I've done twin outboards for years on my dinghy with outboards side by side but no room for two on this boat and lifting one off to put the other on is irritating and dangerous (to me). Ah right, I thought you'd got your CWDF head on, you know, the standard advice that all petrol engined boats are bombs |
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Post by bargemast on Jul 23, 2017 18:16:30 GMT
Another approach may be a small diesel generator, batteries and a larger electric outboard. Or just install a big diesel-generator, as you may be able to make some money at night (but not after 20.00h) to sell your surplus to other boats moored near you. Why would you want to find a simple solution if there are more complicated ones too. Peter. |
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Post by Deleted on Jul 23, 2017 18:57:14 GMT
I hate simple solutions.
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Post by bodger on Jul 23, 2017 19:56:50 GMT
In the good old days nearly all small launches were powered by inboard Stuart Turner petrol engines coupled to Stuart Turner stern gear, they were very simple and AFAIK very reliable.
With the reliability and comparative silence of modern outboards, it became a no-brainer - no hull penetrations, a motor that can be lifted out and taken home for servicing.
It seems to me that you are over-engineering the matter, if you don't mind me saying so.
I have a 16ft Bonwitco launch driven by a Minn Kota electric outboard with lots of batteries, solar panels, controllers, domestic power, etc.
My standby is an old Evinrude 2 stroke 4HP that starts on third pull every time and has an integral petrol tank. When not in use it is stored in the 'stern sheets' along with 4 cans of petrol, in an open well with a drain, designed like a gas locker.
I find it very relaxing to cruise with no engine noise, and without having to worry about leaks in the stern gear, and not needing a rudder keeps it very simple. If I'm in a hurry I hang the Evinrude off the back, insert the ear plugs, and buzz along faster than I should to limit the time spent blocking the buzz.
An inboard diesel engine or generator will likely be air-cooled and bloody noisy.
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