johnstop
New Member
what size ob do I need to get me home from a couple of miles offshore in a 20'
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what size aux o/b?
- Thread starter johnstop
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LeytonC
Well-Known Member
The biggest 1 the transom will take!
(Please fill in your profile, i.e. what boat do u have!)
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Leyton
(EXTAR Solutions - Software that works for you)
(Please fill in your profile, i.e. what boat do u have!)
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Leyton
(EXTAR Solutions - Software that works for you)
ggg
New Member
15hp minimum. Will get you back slowly.
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boatone
Well-Known Member
I had a 10hp on Hurley 22 deep keel raggie at one time. Pushed it along very nicely at displacement speed - around 5knots or so. So I guess youd get a fairly good get you home result on a 20 footer.
Must be some around here who'd help you out with a pre-purchase test run/jolly......
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Must be some around here who'd help you out with a pre-purchase test run/jolly......
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duncan
Well-Known Member
Barry gets home often with his 4hp / 4stroke
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BarryH
Well-Known Member
Gee thanks.
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Col
Well-Known Member
We got back on a Bin Laden 30ft on a 4 hp, after the prop hub had spun out, mind you, was V. slow
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Happy1
N/A
I have a 20ft and a bit Cuddy sports boat, I researched the same as you and ended up buying a mercury 3.3hp. The reason I chose this was that it tucked away nicely at the sid eof my engine bay out of sight, it also works well on my Zodiac 260 dinghy, and gives me a top speed of 3.2knots. I decide that would be enough to keep me out of trouble and limp home.
I also considered at one stage rafting my dinghy to the boat to push it home, not a good idea if you are out on your own /forums/images/icons/laugh.gif. I only considered that as I thought I would need a long shafted one for my boat, but after measuring I found that it would fit, which was great as I had the best of both worlds. Now whether you feel that is fast enough is up to you, but having weighed up all the pro's for getting this size, I went for it. I fitted on a Plastimo outboard bracket, they do a nice one in white plastic with SS fittings, it looked nicer on my boat than the wooden block ones.
I have not been dissapointed and it works well for my needs. Had I gone for a 4 stroke or bigger two stroke, it would not have fitted in the engine bay or on the dinghy, and it would need to have been stored carefuly to stop the oil leaking out, it is also a heavier engine. Due to the size of my boat everything I put on it is carefuly selected for weight /forums/images/icons/wink.gif Same as the Zodiac dinghy, which is one of the lightest and folds up really small in the bag. If storage is not a problem then look at the Tohatsu 9.8 it is the lightest engine of that size available, has the best power to weight ratio, and is very popular, I think they do a sail version that has a slightly longer shaft.
Good luck
<font color=purple> "You only see what you recognise, and you only recognise what you know" <font color=purple>
I also considered at one stage rafting my dinghy to the boat to push it home, not a good idea if you are out on your own /forums/images/icons/laugh.gif. I only considered that as I thought I would need a long shafted one for my boat, but after measuring I found that it would fit, which was great as I had the best of both worlds. Now whether you feel that is fast enough is up to you, but having weighed up all the pro's for getting this size, I went for it. I fitted on a Plastimo outboard bracket, they do a nice one in white plastic with SS fittings, it looked nicer on my boat than the wooden block ones.
I have not been dissapointed and it works well for my needs. Had I gone for a 4 stroke or bigger two stroke, it would not have fitted in the engine bay or on the dinghy, and it would need to have been stored carefuly to stop the oil leaking out, it is also a heavier engine. Due to the size of my boat everything I put on it is carefuly selected for weight /forums/images/icons/wink.gif Same as the Zodiac dinghy, which is one of the lightest and folds up really small in the bag. If storage is not a problem then look at the Tohatsu 9.8 it is the lightest engine of that size available, has the best power to weight ratio, and is very popular, I think they do a sail version that has a slightly longer shaft.
Good luck
<font color=purple> "You only see what you recognise, and you only recognise what you know" <font color=purple>
tcm
...
The rafting does work, dinghy lashed fore/aft - but as you imply you may need someone steering a bit in the main boat "into" the dinghy whilst the dinghy steers "into" the main boat. Worth a little practice I reckon. In fact, I think I will have a go with ours soon. I did use this to good effect once.
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byron
RIP
4 - 5 hp is more than ample, takes up less storage room and is easier to put on if choppy due to weight. The thing to bear in mind is the word 'auxiliary' you are not looking for a 'replacement' so par-performance is not an issue, you just want to get home.
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Chris771
Well-Known Member
I have always used my trusty Honda 5hp 4 stroke. On a Freeman 24 it gave about 4 kts, on last boat a Skibsplast 700 it gave about 4.5 kts.
Have yet to try it on present Antares 760, but would expect somewhere in the region of 4 kts.
As Byron says, it is a get you home spare, not a replacement. also have the view that 5 hp or less is much easier and safer to get out of locker and fit than a bigger engine.
The only time I ever needed it in earnest was on Freeman 24 when a hose burst. It was a pity that I had decided to paint the bilges that weekend and the outboard was in the back of my truck. Amazing what you can do with a plastic bag and duct tape when pressed.
Chris
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Have yet to try it on present Antares 760, but would expect somewhere in the region of 4 kts.
As Byron says, it is a get you home spare, not a replacement. also have the view that 5 hp or less is much easier and safer to get out of locker and fit than a bigger engine.
The only time I ever needed it in earnest was on Freeman 24 when a hose burst. It was a pity that I had decided to paint the bilges that weekend and the outboard was in the back of my truck. Amazing what you can do with a plastic bag and duct tape when pressed.
Chris
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byron
RIP
As an add on to what Chris has observed. The Freeman is a very heavu boat and even without knowing what your boat is I would hazard a guess 'twice as heavy' so if he was getting 4 knots you can expect at least 5 with a 20 footer.
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ggg
New Member
All very well if it is not nasty weather weather using a 5 hp. I had a 10hp on a heavy 18ft shetland and that was just enough. Perhaps this boat is lighter. It depends on how much reassurance you want if it gets a bit lumpy.
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