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Old 16-08-2016, 09:20   #46
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Re: Trawler - Single Engine vs Twins

Google .... "single vs. twin boats".

31,400,000 hits.

nuthin' new here
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Old 16-08-2016, 09:23   #47
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Re: Trawler - Single Engine vs Twins

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Originally Posted by Cadence View Post
I would also marvel at some of the awful attempts made by people with twin screws.
Those people that still need a bow thruster with twins also tend to have a stern thruster. Give them too many things to play with and they get worse, not better.
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Old 16-08-2016, 09:28   #48
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Re: Trawler - Single Engine vs Twins

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Originally Posted by Defeverboat View Post
When docking in high wind you need two engines or bow thruster.
No I don't
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Old 16-08-2016, 09:54   #49
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Re: Trawler - Single Engine vs Twins

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Originally Posted by boatpoker View Post
Those people that still need a bow thruster with twins also tend to have a stern thruster. Give them too many things to play with and they get worse, not better.
I don't think most have thrusters. They just get carried away with
RPMs, forward and reverse. Response is not instantaneous.
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Old 16-08-2016, 09:58   #50
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Re: Trawler - Single Engine vs Twins

I used to moderate a discussion topic at TrawlerFest events around the country that was generally on this topic: single vs. twin. The arguments were as you state, and while the discussions were polite, and was never sure that anyone's opinion was altered post-discussion.

Single engine advantages:
  1. Propeller and rudder protections
  2. Generally better efficiency
  3. Larger propeller diameter
  4. Half the maintenance
  5. Simpler systems
  6. Generally better space utilization.

Twin engine advantages:
  1. Redundancy if you have a complete engine failure
  2. Redundancy if you have a drive train problem
  3. Maneuverability in close quarters
  4. Redundant fuel and other support systems

In my personal opinion, if you're going to go at displacement speeds, I'd have a single engine boat. Brian Saunder's previous boat, Traveller, was close to my ideal. This presumes several things: you have a wonderful fuel management system, you have regular engine maintenance, a large anchor that can be quickly deployed would be a good idea, too.

Incidentally, the other topic that I moderated was "displacement, semi-displacement, or planing?" and it also generated lots of interest, but few changed minds.

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Old 16-08-2016, 10:10   #51
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Re: Trawler - Single Engine vs Twins

Just to add some drift. Watching docking is almost as much fun as going to a boat ramp on the weekend.
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Old 16-08-2016, 10:13   #52
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Re: Trawler - Single Engine vs Twins

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... with a single ... the rudder is about 1/10 the size of one on a sailboat ...
Really?

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Old 16-08-2016, 10:31   #53
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Re: Trawler - Single Engine vs Twins

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Really?

I think it is more of a dah! That is a nice looking rudder.
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Old 16-08-2016, 13:20   #54
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Re: Trawler - Single Engine vs Twins

I've gone from sail to trawler five years ago and although I sometimes miss sailing, cruising in a trawler is much more comfortable and more protected in rain and cold with the inside steering station.

I have a single myself with bow thruster and it is just fine. I don't need twice the engine maintenance costs and I'm too old to bend my body in the strange positions twin engines would require. If you keep that single diesel happy with regular oil changes, valve adjustments and coolant changes it should be very dependable as long as you have the proper primary filter setup.

For that you definitely need dual primary filters with a way to switch from one to the other easily. You don't want to be changing filters in a seaway.

Regardless of whether you go twin or single, you should know that a trawler is not going to maneuver like a sailboat. All boats are steered with the stern but on a trawler this really is more evident. If you go with a twin, you will have to learn how to handle those engines to turn the boat.

There are many good books on how to dock and steer motor boats and I would strongly recommend you get one or two and learn from them first.

Good luck with your next boat!

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Old 16-08-2016, 15:46   #55
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Re: Trawler - Single Engine vs Twins

Here's a link to one of my favourite trawlers. It's ugly but interesting. Has the best or the worst of both worlds; I haven't decided which yet!

Windhaven - One of a kind
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Old 16-08-2016, 16:01   #56
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Re: Trawler - Single Engine vs Twins

Diesel Duck!
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Old 16-08-2016, 16:13   #57
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Re: Trawler - Single Engine vs Twins

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Here's a link to one of my favourite trawlers. It's ugly but interesting. Has the best or the worst of both worlds; I haven't decided which yet!

Windhaven - One of a kind
OMG! Perhaps the naval architect once specialized in army barracks?
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Old 16-08-2016, 17:26   #58
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Re: Trawler - Single Engine vs Twins

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Originally Posted by Kiwi. View Post
Here's a link to one of my favourite trawlers. It's ugly but interesting. Has the best or the worst of both worlds; I haven't decided which yet!

Windhaven - One of a kind
Kind of reminds me of a great harbor. Beamy, lots of freeboard & 2 Yanmars.

2008 Great Harbour N47 Trawler Power Boat For Sale - www.yachtworld.com
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Old 16-08-2016, 18:03   #59
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Re: Trawler - Single Engine vs Twins

Training Wheels
I'm with you on that. Now where is piggy bank and hammer?
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Old 16-08-2016, 18:14   #60
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Re: Trawler - Single Engine vs Twins

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Originally Posted by Kiwi. View Post
Here's a link to one of my favourite trawlers. It's ugly but interesting. Has the best or the worst of both worlds; I haven't decided which yet!

Windhaven - One of a kind
I told the owner it is Fantastically Ugly, that he should call it "Fugly". No idea why he didn't like the idea.
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