Ford 6cyl 7210 engine.

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SLC

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I have fallen for a John Robins design/build trawler yacht that is 37'loa and has a displacement weight of 22 tons and dry weight of 18.

A couple of questions:

1) Is the Ford 7210(120hp) enough to push her along at 6.5 kn cruising speed without too much strain?

2) Are there any gremlins with this engine, anything that I should worry about?

Thanks.
 
SLC said:
I have fallen for a John Robins design/build trawler yacht that is 37'loa and has a displacement weight of 22 tons and dry weight of 18.

A couple of questions:

1) Is the Ford 7210(120hp) enough to push her along at 6.5 kn cruising speed without too much strain?

2) Are there any gremlins with this engine, anything that I should worry about?

Thanks.
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Be prepared for a very smokey start and warm up.Other than that they are bomb proof.Good old fashioned engineering.
6 knots sounds feasible.
 
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I understand that her speed won't be increased much by more hp, my worry is the hp she has being too little for her weight.

You'll have to excuse my ignorance where this type of boat is concerned as my experience is limited to river use where hp isn't of too much concern.

Thanks for your reply.
 
Here's the specs for an Ocean Alexander 44' Twin screw:http://www.trawlerforum.com/forums/s6/repower-16285.html

.If you're pulling the engine anyway, I'm curious if OA offered a different brand in that hull...perhaps a Cummins? By the way, per the prop charts and my data gathering, our 30,000 pound OA 44 twin makes 7.5 knots @ ~45 HP (total), 8.4 knots on about 65 total horsepower. 9.8@ 110 HP, 11 knots @ 120HP). Different hull from yours, but Monk did provide OA with some fairly efficient designs in the trans-hump region .
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omega2 said:
She will not go much quicker no matter what power you put into her, as stated they do smoke on start up but soon clear when under load and warmed upl

http://bf494.co.uk/blog1.php/2009/02/21/ford-lehman-marine-diesel-engine-stuff

this is good info!
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rustybarge said:
Here's the specs for an Ocean Alexander 44' Twin screw:http://www.trawlerforum.com/forums/s6/repower-16285.html
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That's great, thanks.

Nothing to worry about it would seem, apart from my further worry about single engined craft but I'll get over that.
 
No problem with single engine… had one for years. Keep maintenance 100% upto date, ensure you have the best fuel filtration possible (May well need an update), and regular engine/fuel checks and I am sure she will serve you well.
 
SLC said:
I have fallen for a John Robins design/build trawler yacht that is 37'loa and has a displacement weight of 22 tons and dry weight of 18.
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Don't follow those figures. Displacement is the boat's weight. What accounts for the 4 tons difference in your two figures? Of course the displacement varies from the design figure to in use by adding fuel, water and gear - but 4 tons?
 
Firefly625 said:
No problem with single engine… had one for years. Keep maintenance 100% upto date, ensure you have the best fuel filtration possible (May well need an update), and regular engine/fuel checks and I am sure she will serve you well.
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Thanks, that helps put my mind at rest.

Tranona said:
Don't follow those figures. Displacement is the boat's weight. What accounts for the 4 tons difference in your two figures? Of course the displacement varies from the design figure to in use by adding fuel, water and gear - but 4 tons?
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I am just going off the figures quoted and they state a dry weight of 18t.

Fuel@400gallons and water@200gallons, where the extra weight comes from I am not sure. At the moment I haven't gone too far into it, she is a boat that I hadn't considered until a few days ago but is now firmly in my top three to view.
 
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If my questions seem a little dumb now just wait til I get really confused.

This is a very big leap for me, the little experience I have with boats was gained on canal charters and as a member of a family river boat syndicate. So considering sole ownership of a boat and entering into tidal situations is rather daunting, especially if it turns out to be a 22ton, 37' trawler yacht.
 
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SLC said:
If my questions seem a little dumb now just wait til I get really confused.

This is a very big leap for me, the little experience I have with boats was gained on canal charters and as a member of a family river boat syndicate. So considering sole ownership of a boat and entering into tidal situations is rather daunting, especially if it turns out to be a 22ton, 37' trawler yacht.
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Eos is a pure displacement trawler yacht, 48', and we carry 800 gallons of fuel and 400 gallons of water and when we were lifted recently were told we weighed about 23 tons, and that's with a dive compressor, dive gear, rib, dinghy etc etc so I'd be very surprised if a 37' will weigh just a ton less.

Wrt the engine, we've got twin Ford lehman 135s and we normally run at about 1600rpm which produces approx 45hp each engine, so I'd guess that your 120hp engine should be fine.

Do you have any more details you can share with us, always interesting to see other boats/designs.
 
7210? Are you sure, not 2710 or similar?
I have the Dover, which I think is the 2722. As above, it is bombproof. 11000 hours so far, I asked the engineers if I should service the injectors and overhaul the pump, but they said as long as it starts and runs well don't fiddle. It doesn't smoke on startup. Oil change religiously every 200 hours. It burns about a litre per 200, Mermaid say worry when the oil consumption reaches 2% of fuel. These engines go up to 300hp.
 
I have a Marine Trader 40 Europa that is VERY similar to the boat I think you are looking at. She has twin 120hp 2723 Fords and cruises at 8 knots and max's at 11 knots. She will also run quite happily on one engine at around 6-6.5 knots. Whilst my engines have only 300 hours on them, these are well thought of with many thousands of hours possible before any major work.
 
Did you manage to go and see this boat , what was the state and that of the engine , as I had seen one like this for sale
 
caver38 said:
Did you manage to go and see this boat , what was the state and that of the engine , as I had seen one like this for sale
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Due to unplanned business commitments I was unable to free up the time, unfortunately. Thankfully I hadn't contacted the seller so I hadn't let anyone down or messed them around.

Hopefully this will not be an issue in the new year(February) if she's still for sale, that is.

Also have to get 'wifey' back on side, she has now decided(after watching Trawlermen)that it looks too much like a fishing boat. No accounting for taste, even bad taste.
 
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Jegs said:
Oi RB, how I am I going to get anything done now that you've introduced me to that site?


John G
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hi Jegs,

I'm converted to the yank outlook on boating: trawlers trawlers trawlers .......:D

The biggest shock is how traditional their outlook is in comparison to the UK market, but of course they have the great loop on the ICW and the PNW coast as well; thousands and thousands of miles of sheltered cruising.

ford lehmans and cummins seem to be the favourite engines, spares are freely available for both types at cheap prices.

With the exception of sports and game fishing boats, 90% of the remaining boat market seems to be trawlers designed for cruising, rather than day boating.
 
SLC said:
If my questions seem a little dumb now just wait til I get really confused.

This is a very big leap for me, the little experience I have with boats was gained on canal charters and as a member of a family river boat syndicate. So considering sole ownership of a boat and entering into tidal situations is rather daunting, especially if it turns out to be a 22ton, 37' trawler yacht.
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22 ton is your displacement which is the weight of the water you displace. 18 tons is the weight in air. Your engine is being tasked only to push your weight in water (which will be considerably less) and the resistance and drag caused by the water. For example I bet you will be able to pull your boat manually along the quayside (even if you need to lean into the rope to start with). But I bet you would find it much harder to pull a 18 ton weight along the road, even if on wheels.
The calculations for engine power requirement are a bit much for here but if your boat still has an engine of that vintage after all these years I'm guessing it does the job just fine. :)
 
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