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Old 13 September 2011, 14:19   #1
Country: Canada
Town: Lake Country
Make: avon tender
Length: 3m +
Engine: Outboard electric
Join Date: Sep 2011
Posts: 6
Thrust vs HP

Does anyone know what thrust a 3hp gas motor would give. I want to buy a electric motor for my Avon redstart.

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Old 15 September 2011, 19:44   #2
Country: Other
Town: Stanley, Falkland Is
Boat name: Seawolf
Make: Osprey Vipermax 5.8
Length: 5m +
Engine: Etec 150
Join Date: Mar 2006
Posts: 3,704
I guess it depends on what pitch prop is fitted - in the same way that the towing pull of a vehicle depends on the gearing. A relatively low powered 4x4 in low range would generate a higher drawbar pull (thrust) than a Ferrari with maybe 5x the power, and likewise a fine pitched prop (like the "Saildrive" aux motors some companies make) should generate a higher thrust than one fitted with a conventional prop designed to push a smaller boat at a higher speed.

Probably not the answer you wanted though

A Boat is a hole in the water, surrounded by fibreglass, into which you throw money...

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Old 16 September 2011, 00:43   #3
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Country: Canada
Town: Vancouver, BC Canada
Boat name: Black Ops
Make: Zodiac Hurricane 733
Length: 7m +
Engine: OceanPro 150hp x 2
Join Date: Oct 2008
Posts: 246
You will not find an equivalent speed unless you go with a "torquedo". I was quite happy with my 30-40 lb thrust Minnkota on my 10 footer. search youtube for minnkota and zodiac or inflatable.
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Old 16 September 2011, 00:44   #4
Country: USA
Town: Seattle
Boat name: Water Dog
Make: Polaris
Length: 4m +
Engine: Yamaha 60hp
Join Date: Apr 2007
Posts: 1,152
VERY very roughly 110lbs of thrust = 1 hp. But its really an apples and oranges kind of comparion.

The very largest 24V trolling motors may get close to the HP of a 3hp gas engine.
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Old 16 September 2011, 06:22   #5
Country: UK - Scotland
Boat name: Wildheart
Make: Humber/Delta Seasafe
Length: 5m +
Engine: Merc 60 Clamshell
MMSI: 235068449
Join Date: Apr 2007
Posts: 4,614
I guess this is for actual trolling rather than getting from A to B?

Just 'coz what they usually omit to mention in the "how light our electric motor is compared to an outboard" waffle is the weight of the battery......

But back to the original Q, Wot Bog said +1.
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