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Outboard motor for 20 foot swing keel - HP?

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Created by Fiesta > 9 months ago, 10 Aug 2013
Fiesta
QLD, 122 posts
10 Aug 2013 9:59AM
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Hi,

I am in the process of replacing our outboard for a 20 foot swing keel spacesailer.

Primary goal is to get a unit that is light enough to easily remove off the transom and still give enough thrust for pushing a bit of tide / windage drag. The eternal dilemma!

The bracket on the transom is pretty low and the 5HP unit I have is a real struggle to lift on and off. Due to the transom hung rudder there is not a notched transom like a hood 23 etc to easily access the bracket.

I think I could "get away" with a 3.3hp unit, but I am struggling to find one with a Reverse Gear - Pivoting the engine through 180 degrees is tricky due to clearance to the transom.

Any thoughts on my options?

Donk107
TAS, 2446 posts
10 Aug 2013 11:27AM
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Hi Fiesta

Just a question

Why do you have to take the motor off (i assume it is when when you trailer it)

On my 20 foot fin keeler it has a 6hp Johnson on a lifting bracket and if it was a swing keeler with it in the up position i would imagine it would be trailable with the outboard supported as you would do on a power boat

Regards Don


southace
SA, 4776 posts
10 Aug 2013 3:33PM
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Select to expand quote
Fiesta said..

Hi,

I am in the process of replacing our outboard for a 20 foot swing keel spacesailer.

Primary goal is to get a unit that is light enough to easily remove off the transom and still give enough thrust for pushing a bit of tide / windage drag. The eternal dilemma!

The bracket on the transom is pretty low and the 5HP unit I have is a real struggle to lift on and off. Due to the transom hung rudder there is not a notched transom like a hood 23 etc to easily access the bracket.

I think I could "get away" with a 3.3hp unit, but I am struggling to find one with a Reverse Gear - Pivoting the engine through 180 degrees is tricky due to clearance to the transom.

Any thoughts on my options?


5 hp tohatsu 2 stroke single cylinder is the lightest,most reliable and cost effective outboard on the market... It's weight is 19kg and I quite often lift it from my tender up onto my yacht without to much trouble.

cisco
QLD, 12337 posts
10 Aug 2013 4:23PM
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southace said..
5 hp tohatsu 2 stroke single cylinder is the lightest,most reliable and cost effective outboard on the market... It's weight is 19kg and I quite often lift it from my tender up onto my yacht without to much trouble.


That would be the same engine as a Mercury or Mariner wouldn't it???

Ramona
NSW, 7584 posts
10 Aug 2013 6:31PM
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cisco said..

southace said..
5 hp tohatsu 2 stroke single cylinder is the lightest,most reliable and cost effective outboard on the market... It's weight is 19kg and I quite often lift it from my tender up onto my yacht without to much trouble.


That would be the same engine as a Mercury or Mariner wouldn't it???




Do they sell the Tohatsu 3.5 still? The 3.5 had a gearbox, 2.5 did not. 3.5 with a nozzle would be fine. the 3.5 is the same as a Mercury and a Nissan, not sure about Mariner.

southace
SA, 4776 posts
11 Aug 2013 8:29AM
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I compare tohatsu and mercury to Telstra and Optus. My pic is Telstra/tohatsu !

Fiesta
QLD, 122 posts
11 Aug 2013 3:38PM
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Thanks all, Looking at the Tohatsu 4 HP next week. Is it best to drain integral tanks after use?

Cheers

Donk107
TAS, 2446 posts
11 Aug 2013 3:49PM
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Hi Fiesta

Looking at the Tohatsu website the 5 is the same weight as the 4 and both have a intergral tank and the 5 can run a external tank as well so would a 5 not be a better option

I assume because weight was the issue you are looking at 2 strokes

Regards Don

Fiesta
QLD, 122 posts
11 Aug 2013 5:02PM
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Don,
Yes weight is the issue so staying with the 2 stroke, I think you are correct the 4 HP is the same engine as the 5 HP, with a different injection fitting. So may go to the 5HP depending on the cost differential.

Cheers

Donk107
TAS, 2446 posts
11 Aug 2013 5:13PM
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I can't imagine there would be a huge difference in the price and there might come a time when the extra 1hp makes life a bit easier for you to get somewhere

Regards Don

LooseChange
NSW, 2140 posts
11 Aug 2013 7:00PM
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Of course there is going to be a huge difference, The five horse is a twenty percent power increase over the four horse, so this being a form of Pr1ck tax I expect the five to be at least twenty percent dearer.

Or as the salesman will attempt to explain it; "Oh no sir the the five horsepower model whilst it may look the same is an entirely new motor with very much different and much more expensive technology"

Ramona
NSW, 7584 posts
11 Aug 2013 7:13PM
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LooseChange said..

Of course there is going to be a huge difference, The five horse is a twenty percent power increase over the four horse, so this being a form of Pr1ck tax I expect the five to be at least twenty percent dearer.

Or as the salesman will attempt to explain it; "Oh no sir the the five horsepower model whilst it may look the same is an entirely new motor with very much different and much more expensive technology"


My tender motor is a Tohatsu 2.5 uprated to a 3.5. The previous owner did the conversion, just changed the jets!

LooseChange
NSW, 2140 posts
11 Aug 2013 7:27PM
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Yep, or in some cases they are fitted with restrictor plates in the induction system or a smaller carby. Remove those and or replace, Voila! Instant extra power.



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"Outboard motor for 20 foot swing keel - HP?" started by Fiesta