Adding a auxiliary outboard. - SailNet Community
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post #1 of 26 Old 01-29-2014 Thread Starter
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Adding a auxiliary outboard.

Hi guys, I have a Jeanneau Fantasia 27'-6" yacht. It has a Yanmar 1 GM 10 which is working fine. We are planning a UK circumnavigation in her next year and I am minded to add an outboard to her to give a bit more security in some of the remoter bits of the journey if the prop fouls or the Yanmar conks.

I got hold of the original manual for the boat and if my French is anything to go by (and usually it is not!) the transom on the Starboard side is reinforced for an auxiliary motor bracket and it does appear to be. The problem is that this is the place that the boarding ladder is now fitted. I thought about switching the ladder to Port to create space but that looks like the devil's own job and I am sure that I would need to remove the holding tank and the fuel tank to get at the fixings. I can get at the Port side, no problem, from the back cabin. I am wondering what I need to do to reinforce the transom on the Port side to take the weight and thrust of the motor. I have a nice piece of 1" teak for the outside. I am looking at bonding a piece of marinbe ply to the inside.

The motor I have is a 5hp Honda :BF5 weight 27k. Not very big or powerful I know, but reliable as hell and utterly bulletproof.

If anyone has done anything similar I would value an opinion or suggestion.

Thanks

Last edited by Zuma; 01-29-2014 at 03:10 AM.
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post #2 of 26 Old 01-29-2014
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Re: Adding a auxiliary outboard.

I have a Yanmar 1 gm. Personally, I'd go over it well (maybe with a trusted mechanic) and have appropriate spare parts, and forego the outboard idea -- especially with all the trouble you are proposing.

These motors, when in good condition, are very reliable and easy to work on if something does go wrong.

Plus, you do always have the sails as backup power (sorry, couldn't resist).
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post #3 of 26 Old 01-29-2014
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Re: Adding a auxiliary outboard.

As suggested, focus on the diesel. It is more powerful and the prop is better positioned to be effective. The boarding ladder is probably mounted where it is because of the reinforcement that's already there. Messing with that will be... a mess. If you really want to use the Honda 5hp to move the boat, get a dinghy and try using it to tow, or push while tied securely alongside. Mounting an outboard on most sailboat transoms becomes ineffective very quickly in any sort of seaway. The prop gets lifted out of the water and then overspeeds and cavitates when it's plunged back in. Even Hondas don't like that treatment. Take care of your diesel and it will take care of you. Our Yanmar is 32 this year.

Last edited by paulk; 01-29-2014 at 09:47 PM.
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post #4 of 26 Old 01-29-2014
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Re: Adding a auxiliary outboard.

Make sure you use a mount that is spring loaded to assist with the motors weight and has enough travel to get deep in the water.

How thick is your transom? I'd think a 1in backing plate would suffice. We mounted one on our boat, but the transom on ours is 1/2in thick. We used a 3/4in starboard backing plate and washers, it has held up fine.
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post #5 of 26 Old 01-29-2014
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Re: Adding a auxiliary outboard.

don't forget that now you need to keep another fuel tank on board with the requisite plumbing, and you have spent a ton of time and effort to add a 5 hp gas outboard in case your 9 hp diesel conks out.
What if your O/B conks out?
Spend the money you would spend on cobbling together a bastardized O/B solution and buy a couple of spare fuel filters, a Yanmar spares kit, add a bulb to the diesel line to ease in bleeding, and have the tank cleaned.
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post #6 of 26 Old 01-29-2014
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Re: Adding a auxiliary outboard.

Are you taking a tender? A hip tow arrangement with a powered tender would get you out of most trouble spots if the yanmar takes an inopportune holiday.

I've also seen workable examples of an emergency outboard mount that goes on a deployed stern ladder.

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post #7 of 26 Old 01-30-2014 Thread Starter
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Re: Adding a auxiliary outboard.

Thanks for the replies thus far. I fully intend to look after the 1GM10 which has just been overhauled and is running well and looks to continue to do so. I have read a great deal written by UK and Ireland circumnavigators about the likelihood of running over unmarked fishing lines and fouling the prop, particularly around the Irish coasts. And loss of motor power for one reason or another is the No 1 cause of rescue according to the RNLI. I am not looking for performance. I am just looking to be able to drop the motor and to use it to get back into somewhere where I could sort the situation out. I do take the point about cavitation and the need to position the motor correctly based upon the sprung bracket I have. . The motor will have a small portable tank with pipe connections which I will keep in a locker until needed. I think I will go ahead and fit it. I am going out today to look at the job before any final decision. Thanks again. And Oh yeah. I have got the sails to fall back on. Those are the floppy white things aren't they. (Sorry, couldn't resist ;-) )
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post #8 of 26 Old 01-30-2014
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Re: Adding a auxiliary outboard.

I have often thought about doing the same thing you are proposing.

When I was cruising, I had a 25 HP outboard for my dinghy. I thought it would provide plenty of emergency power for my 42 foot boat (not to mention it could even be a lifesaver with a broken rudder) if I could figure out a way to mount it.

I haven't done it yet, but I keep thinking about using something like this.



So that if necessary, I could merely mount the motor on it, and then lower it to where it could power the boat. I have a swim platform on my boat that would allow me to reach the handle and steer it.

Like I said, I haven't done it yet, but I often think, why waste a motor and just use it for the dinghy?
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post #9 of 26 Old 01-30-2014
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Re: Adding a auxiliary outboard.

Oh, the best OB bracket for the money is the Garhauer OB-125.

I think I paid $180 for it and the quality is far superior to any of the others I looked at, but at about half the price. I do not know if you will be able to get it in the UK easily, though

Also, be wary of keeping a gas tank in your locker. We keep ours outside to prevent fumes leaking down into the bilge or cabin.
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post #10 of 26 Old 01-30-2014
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Re: Adding a auxiliary outboard.

Quote:
Originally Posted by Group9 View Post
I have often thought about doing the same thing you are proposing.

When I was cruising, I had a 25 HP outboard for my dinghy. I thought it would provide plenty of emergency power for my 42 foot boat (not to mention it could even be a lifesaver with a broken rudder) if I could figure out a way to mount it.

I haven't done it yet, but I keep thinking about using something like this.



So that if necessary, I could merely mount the motor on it, and then lower it to where it could power the boat. I have a swim platform on my boat that would allow me to reach the handle and steer it.

Like I said, I haven't done it yet, but I often think, why waste a motor and just use it for the dinghy?
this is what I have on my boat...it was done as the old palmer p60 engine was having trouble

Im leaving it there to use a a swim ladder platform to the davit cross beam and just in case I ever need to plop on an outboard

Im looking for a 15hp was we speak

my boat is 13k displacement but I have used an 8hp yamaha to test if it moved and it did quite decently

cheers

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