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Posted: Fri Mar 13, 2009 8:12pm

Post Subject: what size engine

hi were looking at a new boat eastwest marine 57ft. my question is the engine is a Barrus Shire 3 Cylinders 35 hp. Im worried the engine will be under powered for river use. We would like to cruise the thames. thank you ....mark


Posted: Sat Mar 14, 2009 7:09pm

Post Subject: what size engine

If we ignore the fact that with the correct prop on the boat the power available will be less than quoted because you will not get much more than say 2/3 or the maximum revs the the answer comes down to what you intend to try to do on the Thames. I have a 3 cylinder Bukh, rated at just over 30hp in a 54ft narrowboat and even last summer it was absolutely fine on the Thames. In fact I could get all 54ft of it through Sonning Bridge with no revving and far less wagging about than the high powered cruisers, but that was because I can read the flow and anticipate where to point the boat so I end up in the correct place. This is down to experience and I would hope the inexperienced would have stayed tied up until the steam subsided a bit. It will be absolutely fine during most summer months and has the advantage of being worked a little bit harder when on canals than a larger engine. It may not be fine if the prop is poorly matched to the boat (mine requires a special prop, but it had a standard one on last summer). Naturally you will not keep up with the twin 200hp turbocharged diesel tupperware jobbies, but you will use far less fuel in making big waves & smoke. You will also not get very far upstream against a flood but you should not specify an engine for use perhaps once or twice in a boat's life. Tony Brooks

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