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05-01-2013, 02:07 PM
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#1
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Veteran Member
City: Sekondi
Join Date: May 2013
Posts: 32
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Help in selecting hp for fishing boat
Hi, I am new to this, but can some one out there tell me what horsepower is needed for a 50ft wooden fishing boat. I have got conflicting figures thrown at me and I am confused. A guy told me I need 300hp engine for that type of boat, others recommended 130-150hp engine. The boat is going to be used for coastal fishing and fitted with a side winch. No fancy stuff.
Below is the details of the boat;
LOA - 50ft (15.24m)
Waterline length - 45ft (13.716m)
Beam - 10ft (3.048m)
Daft - 4.06ft (1.237m)
Gross Tonnage - 10tonnes (22046Ib)
Displacement Hull
I have been reading about this and what i found was, for every 500Ib you will need 1hp to propel it. Therefore for 22046Ib that would give me 44.092hp. Add 50% to cater for waves, wind and current would give me 66.138hp. Is this right? I find it very minimal. Is there any formula for determining horsepower requirement for fishing boats?
Thanks. Edington
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05-01-2013, 03:20 PM
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#2
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Guru


City: Biloxi, MS
Vessel Name: Cajun Rose
Vessel Model: Biloxi Lugger
Join Date: Jul 2011
Posts: 1,383
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The boat in the avitar has twin 6-71's at about 238 per engine.
Length is 65'
Beam is 22'
Don't know the weight but I'm sure it's in line with any other 65' wooden boat.
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05-01-2013, 04:28 PM
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#3
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Guru
City: Everett Wa
Vessel Name: Eagle
Vessel Model: Roughwater 58 pilot house
Join Date: Oct 2007
Posts: 2,919
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The Eagle is 51 ft water line, 40 + tons powered by a DD 671, 165 hp. I figure at hull, 7 to 9 knots, about 120 hp. Many 60 ft commercial fish/net boats are powered by DD 671 non turbo.
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05-01-2013, 04:57 PM
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#4
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Valued Technical Contributor
City: Litchfield, Ct
Join Date: Aug 2012
Posts: 6,470
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Eddington:
Your calculations are about right, but your weight seems way low, more like 50,000 lbs or more for a 50 boat'.
I think you are going to need at least 100 hp
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05-06-2013, 01:21 AM
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#5
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Veteran Member
City: Sekondi
Join Date: May 2013
Posts: 32
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Quote:
Originally Posted by djmarchand
Eddington:
Your calculations are about right, but your weight seems way low, more like 50,000 lbs or more for a 50 boat'.
I think you are going to need at least 100 hp
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djmarchard,
I was not comfortable with weight issue, thanks for pointing that out. I am going to have a word with the boat builder. I am thinking of scouting for a reliable 150hp engine.
Any Ideas?
Edington
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05-06-2013, 08:58 AM
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#6
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Guru
City: Concrete Washington State
Vessel Name: Willy
Vessel Model: Willard Nomad 30'
Join Date: Oct 2007
Posts: 18,603
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Anybody notice the 10' beam?
My 30' Willard has a 10' beam.
I think the beam explains the displacement question.
With an aspect ratio of 5-1 .. 3 hp per ton may/will be perfectly adequate.
Find some other boats w the same AR, disp and hull type/shape and compare their power and performance.
It's easy to fall into the overpower trap.
And if your beam and disp numbers are right and if the hull is in fact a FULL disp hull 100hp would be WAY overpowered. Another factor that is a part of this is how much fish will the boat be required to pack? Ice or other loads. Is the 10 ton disp # with full load?
I hope TAD sees this thread.
__________________
Eric
North Western Washington State USA
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