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geezee
United Kingdom
24 Posts |
 Posted - 14 Apr 2016 : 09:56:52
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So, here's one for the serious teccies out there. What, approximately, is the power to weight ratio required to move a boat? That is to say how big an engine do I need (horse power) to move a Norman 32 which weighs approx. 2.5 tons fully loaded plus some extra power left over. Your answers are, as always, very welcome. Thanks.
Gee Zee |
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trevork
3949 Posts |
Posted - 14 Apr 2016 : 13:57:44
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Most 32's have inboard engines at the stern, a lot also have outdrives such as the Enfield. Depends how much money you want to spend £3K plus on a new Beta or find one with a good old 1.5 BMC.
Where you are using the boat also has a bearing. Broads, Canals and many rivers have a 6mph or even lower speed limit.
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df
United Kingdom
5994 Posts |
Posted - 14 Apr 2016 : 15:36:52
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5hp outboard would get it moving, once going probably pretty close to it's hull speed too, BUT.... It'll take 20 times as long to stop again and manouvering would be a complete nightmare.
15-20 would probably be enough for canal cruising if going for outboard but as said most 32's had inboard usually with enfield outdrive, any small diesel would be fine.
I recon you'd be a good bit over 2.5 tons once loaded.
NBAS--The communal colostomy bag of the boating community.
Visit leomagill.co.uk |
Edited by - df on 14 Apr 2016 15:37:28 |
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stratford4528
United Kingdom
414 Posts |
Posted - 15 Apr 2016 : 21:15:00
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I have fitted a 25hp 3 cylinder kubota in my 32 and connected to the enfield leg which I think is what a lot of the betas are. The engine I took out was a single cylinder Yanmar which was either 8 or 12 hp which pushed the boat along well.
I Have a Norman 25 which has a Perkins 4108 in it about 50 hp. Far to powerful its 4 mph on tick over. |
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jud
United Kingdom
113 Posts |
Posted - 16 Apr 2016 : 12:08:01
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My 32 had a merc. benz 42hp inboard diesel with Transa outdrive.
When we lifted her out for servicing and painting, etc, the crane gauge clocked just over 3 ton. |
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geezee
United Kingdom
24 Posts |
Posted - 17 Apr 2016 : 11:03:40
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Thanks very much one and all. Very helpful.
Gee Zee |
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ENGINE POWER TO WEIGHT RATIOS
