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11-09-2020, 13:22
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#16
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Registered User
Join Date: Jan 2018
Boat: 50ft Custom Fast Catamaran
Posts: 11,832
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Re: What size motor ?
Interesting responses.
I’m picturing the one day he’s out there and it starts blowing 60 knots from a thunderstorm and all he has is this little kicker to get home, he’ll wish he had the 9.9 high thrust.
He has no other source of propulsion. This isn’t an auxiliary sail motor.
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11-09-2020, 13:34
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#17
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Registered User
Join Date: Nov 2007
Boat: TRT 1200
Posts: 7,268
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Re: What size motor ?
Quote:
Originally Posted by Ifitsworthdoing
Six HP should definitely be sufficient for your boat and usage. Compared to Honda, Mercury/Tohatsu, Evinrude (2.15:1) and Yamaha (2.08:1), the Suzuki offering has the lowest gearing with 1.92:1 and a correspondingly slightly lower wide open throttle (WOT) rpm of 4,750 to 5,750, making it arguably your best bet. They all weigh around 25kg so a good deal less than the 8 or 9.9HP engines ...
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You actually want a higher geared lower unit like the Yamaha T9.9 with a lower unit gearing of 2.92:1.
The only suitable 6hp with an extra long 25” shaft may be this one.
https://www.tohatsu.com/marine/int/o...s/mfs6c_1.html
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11-09-2020, 13:37
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#18
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Registered User
Join Date: Sep 2020
Posts: 11
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Re: What size motor ?
Hi Tillerjockey,
Thank you very much, that is very good news and very reassuring. If this is what you have actually used with no problem then with the weight of our little boat it should not be a problem !
Thanks !
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11-09-2020, 14:29
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#19
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Marine Service Provider
Join Date: Sep 2014
Location: Auckland, NZ
Boat: Compass 790 , 7.9 metres or 26 ft
Posts: 2,803
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Re: What size motor ?
Quote:
Originally Posted by flynnboy
Thanks very much compass, that is a little reassuring. I basically know nothing, yet, and so just was not sure if a 6 hp would be man enough or not. So, basically you think it would be fine for that boat and just pottering around inshore ? Would you suggest 4 stroke or 2 ?
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I agree with A64 pilot here, 4stroke preferable for the reasons he states + you dont get the fuel/oil mix problems when someone forgets to mix the oil in the petrol. 4 strokes are a lot less smelly & being a breath holding diver I hate the oil slick they leave on the sea surface.
We actually have used our 2hp like Panope showed in his vid to drive our keelboat in no/little wind conditions when diesel failed in first week of a 6 week cruise.
I suspect with your pictured boat with no keel ( centreboard up) you could get away with a standard prop with no issues.
It's much better to have the outboard in a well inside the boat than hanging on the transom ( back ) in rough weather. Somehow i guess you don't want to build a well & chop up your first boat.
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11-09-2020, 14:36
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#20
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Moderator
Join Date: May 2008
Location: cruising SW Pacific
Boat: Jon Sayer 1-off 46 ft fract rig sloop strip plank in W Red Cedar
Posts: 21,156
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Re: What size motor ?
FWIW: Long ago I had a Catalina 22 which weighed somewhere around a tonne. Had various outboards on her, ending with an elderly (and this was in ~1974) Johnson 6 hp long shaft. It was completely adequate in power in San Francisco bay where we routinely needed to motor in >25 knot winds. In flat water, no problem, in heavy chop the pitching would pull the prop out of the water and no amount of power would drive the boat into the wind. For the OP's boat, the idea of successfully motoring in a 60 knot wind is sheer dreaming... just not gonna happen, Chotu!
Jim
__________________
Jim and Ann s/v Insatiable II, lying Port Cygnet Tasmania once again.
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11-09-2020, 14:38
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#21
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Moderator
Join Date: May 2008
Location: cruising SW Pacific
Boat: Jon Sayer 1-off 46 ft fract rig sloop strip plank in W Red Cedar
Posts: 21,156
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Re: What size motor ?
FWIW: Long ago I had a Catalina 22 which weighed somewhere around a tonne. Had various outboards on her, ending with an elderly (and this was in ~1974) Johnson 6 hp long shaft. It was completely adequate in power in San Francisco bay where we routinely needed to motor in >25 knot winds. In flat water, no problem, in heavy chop the pitching would pull the prop out of the water and no amount of power would drive the boat into the wind. For the OP's boat, the idea of successfully motoring in a 60 knot wind is sheer dreaming... just not gonna happen, Chotu!
Jim
__________________
Jim and Ann s/v Insatiable II, lying Port Cygnet Tasmania once again.
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11-09-2020, 15:41
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#22
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Moderator
Join Date: May 2008
Location: cruising SW Pacific
Boat: Jon Sayer 1-off 46 ft fract rig sloop strip plank in W Red Cedar
Posts: 21,156
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Re: What size motor ?
FWIW: Long ago I had a Catalina 22 which weighed somewhere around a tonne. Had various outboards on her, ending with an elderly (and this was in ~1974) Johnson 6 hp long shaft. It was completely adequate in power in San Francisco bay where we routinely needed to motor in >25 knot winds. In flat water, no problem, in heavy chop the pitching would pull the prop out of the water and no amount of power would drive the boat into the wind. For the OP's boat, the idea of successfully motoring in a 60 knot wind is sheer dreaming... just not gonna happen, Chotu!
Jim
__________________
Jim and Ann s/v Insatiable II, lying Port Cygnet Tasmania once again.
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11-09-2020, 15:56
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#23
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Registered User
Join Date: Jan 2018
Boat: 50ft Custom Fast Catamaran
Posts: 11,832
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Re: What size motor ?
OK, OK, OK, Jim!
(Joking with you about telling me that 3 times). Ha ha ha.
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11-09-2020, 16:04
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#24
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Registered User
Join Date: Sep 2007
Location: Queensland, Australia
Boat: None at present--between vessels. Ex Piver Loadstar 12.5 metres
Posts: 1,475
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Re: What size motor ?
You are using a motor on a hull that was never designed for planing. Consequrntly there is NO POINT in fitting a powerful motor--yes you will go a littler faster--but only at the risk of your vessel and those aboard. A ten horsepower outboard would be MORE than adequate. Five horsepower four stroke or even a two stroke would do it.
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11-09-2020, 16:42
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#25
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Registered User
Join Date: Feb 2015
Location: Cape Town South Africa
Boat: Montevideo 43
Posts: 95
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Re: What size motor ?
It is a sailboat. . 2.5 hp will do it!
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11-09-2020, 16:44
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#26
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Registered User
Join Date: Jan 2018
Boat: 50ft Custom Fast Catamaran
Posts: 11,832
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Re: What size motor ?
Quote:
Originally Posted by Jannie Radiance
It is a sailboat. . 2.5 hp will do it!
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With no sails
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11-09-2020, 17:06
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#27
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Registered User
Join Date: Feb 2013
Location: Ocala FL
Boat: 1979 Bristol 35.5 CB
Posts: 1,953
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Re: What size motor ?
it is 4.1 meters (13 feet) and 130 kg.
I pushed my 20,000 lb 44' C&C at 3.5 knots with an ancient 5HP Nissan on the dinghy.
6 hp is plenty, 9.9 overkill.
if the weather is bad, you'll be wishing for a bigger boat, not a bigger motor.
__________________
John Churchill Ocala, FL
NURDLE, 1979 Bristol 35.5 CB
Currently hauled out ashore Summerfield FL for refit
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11-09-2020, 17:15
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#28
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Registered User
Join Date: Jun 2010
Location: Easton, MD
Boat: 15' Catboat, Bristol 35.5
Posts: 3,510
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Re: What size motor ?
I had a catalina capri 22 with a 4HP tohatsu four strike and high thrust prop. It pushed it 6 kts, hull speed. It was about 2600 lbs.
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12-09-2020, 06:02
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#29
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Registered User
Join Date: Feb 2013
Location: Kingston Ont Canada
Boat: Looking for my next boat!
Posts: 3,101
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Re: What size motor ?
I used a honda 2.3 on a Siren 17 (750 pound boat, plus gear, plus crew). 2.3 was plenty to go fast. The issue is not HP, its waterline. Short boats go slow unless you add A LOT of hp in order to exceed hull speed.
Also, be sure the prop extends below the hull. It depends on your engine mount, but usually a long shaft is much better.
So to answer your question...6hp is plenty...more than enough. Have fun!!!!
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12-09-2020, 09:47
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#30
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Registered User
Join Date: Feb 2012
Location: SF Bay Area
Boat: Freedom 28 Cat Ketch
Posts: 117
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Re: What size motor ?
Or you could hang TWO 6’s off the transom...
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