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Old 13-07-2011, 20:16   #1
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Got the Shaft

Hello, for my first post I have a question, for various reasons I need to pull my driveshaft and motor, install additional batteries where my motor and transmission were.

I do understand that an inboard is definately the best instead of using an outboard to power a 32 ft ferro sailboat, however that option is not availabile nor will it be for many years to come.

Am being forced to leave NZ and head for Australia, by Immigration and need the best information for safely plugging the hole where the shaft was.

I have mounted a new Yamaha 15 on the back of the sailboat, and plan on reuseing the shaft, prop, etc later to install a proper motor and transmission.

I do not want to leave the shaft in the boat.

My thoughts were a shorter s/s shaft with new forward and rear packings, anode in the boat and outside the boat to keep the shaft in place, any advise would be appreciated, thanks Ron

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Old 14-07-2011, 03:56   #2
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Re: Got the Shaft

Greetings and welcome aboard the CF, Ron.

Remove the shaft, and plug the hole with ferrocement.

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Old 15-07-2011, 20:40   #3
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Re: Got the Shaft

I had thought about filling the stuffing box with something, but am conserned with being able to reinstall the shaft later when I do have a motor and transmission to install. I don't think I would be able to get the ferro cement, caulk, etc out later, and want to leave the stuffing box in the boat. Any other ideas fellas?
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Old 15-07-2011, 20:43   #4
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Re: Got the Shaft

Just 2 additional thoughts, has anybody hung a 35 hp outboard or so,on the back end of a large 32 ft sailboat and actually gone quite offshore with it, assuming the bracket would hold it.

Second question anybody used a 15hp outboard or so and crossed any oceans, how did it workout for you?
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Old 15-07-2011, 20:52   #5
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Re: Got the Shaft

Plugging it with the old shaft, perhaps shortened, with a couple of zincs is not too bad of an idea....until the external zing goes away. Make the packing gland extra tight. Maybe wire the internal zinc to something to hold the shaft in the hole.

Offshore you don't need any motor at all. 35 should be more than enough. 10 would probably be enough for most situations. The usual problem is that the pitching of the boat causes the propeller to either surface or the motor to submerge.

If you know how to sail...see other thread...a motor is rarely needed. Might be sufficient to just use the dinghy sidetied to the boat for the occasional marina or channel entry.
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Old 15-07-2011, 23:31   #6
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Re: Got the Shaft

How about threaded rod through ply blanking plugs with nuts outboard to tighten against rubber gasket say car tube
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Old 16-07-2011, 01:09   #7
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Why would you want to remove a shaft that is plugging a hole in your boat only to replace it with something that is probably not as effective, just before crossing one of the rougher seas on the planet?

If there is a problem with leakage then replace the packing and secure both ends of the shaft. Putting an anode on the shaft and checking that the coupling is secure is essential, but doing more would be advisable.

As for securing the outboard to the ferro transom I would expect that if the ferro itself and the fitting and backing plates were less than perfect the movement of the boat would enlarge the holes, leading to possible damage that could compromise the hull.

I'd strongly recommend removing the outboard and securing it below deck if this can be done safely.

You may also care to ensure that all fuel containers are secured so they cannot come loose and do not leak.

As the boat may have little customs value can you not arrange with Customs to leave the boat in New Zealand and fly to Australia, returning with sufficient cash to do the job properly?
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Old 16-07-2011, 17:03   #8
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Re: Got the Shaft

I am a little worried about a threaded rod approach and wont use it, plan on using the 15 hp yamaha ( new ) and taking it downstairs for storage when offshore, was just wondering about the weight of a johnson 35 as I have a new new one ( short shaft ) with low hours on another boat here in NZ. Also have a enenrude long shaft 9.8 low hours I could take also to have a spare motor as a backup. ( your comments ) I require the full space where the old inboard motor and trans were for the batterys, etc and the shaft is way too long to leave in the boat, want to protect the shaft and take the prop off to store on the boat with the front shaft to transmission fitting. I do like the previous posters idea of s/s shaft collars on back and front of the shaft with an anode and tight gland packing with a spare carried. Any other wisdom out there?

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