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Pontoon replacement alternatives  Rating:  Rating
 
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 Posted: Fri Jul 11th, 2014 09:56 am
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marlyn
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Hi all,

I recently got an old semi ridged 4.2m Maverick rubber duck for free, the Hull seems to be in fine condition, but the pontoons are shot.

The quote I received for replacing the pontoons came to R12 000.

And here is the stupid question:
Are there any alternatives to replacing these pontoons (apparently containing some sort of rare metal)

OR...

Will it be possible to fit ridged sides to the hull, making it a normal solid hull boat. I'm a bit worried that the weight will be effected in such a way that the waterline will change, and thus making the hull sit lower in the water. Making the scuppers useless, and basically changing the hull into a bath...

The idea is to have a small enough craft to use on inland waters which is light enough to be launched and handled by one person.

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 Posted: Fri Jul 11th, 2014 06:43 pm
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benniejordaan
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The short answer unfortunately is no, not really. The new laws call for a certain height gunwales for rigid boats. Besides, the costs would be ridiculous. Fit pontoons - best option. Or make some sort of bass boat fishing platform. How is the buoyancy?

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 Posted: Mon Jul 14th, 2014 10:23 am
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marlyn
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Hi Bennie, thanks for the reply.

My suspicion is that there is no or very little in terms of buoyancy , I'll have to open up the deck to inspect.

It will probably not be economically viable to replace the pontoons with anything else but new pontoons, as you suggested.

The idea was to obtain polyurethane cylinders / tube the same diameter as the pontoons which would then be shaped to fit where the pontoons have been.

The Poly-foam will then be covered with 2 layers of fibreglass to give it a hard outer skin and basically changing the pontoons from inflatable to rigid.

The foam can be cut in any shape by the suppliers, or using simple hand tools, so I could for instance change the shape of the pontoon to allow for more deck space than the standard inflatable. But I'll still need to conform to the legislation wrt gunwale height etc...

Last edited on Mon Jul 14th, 2014 11:57 am by marlyn

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 Posted: Mon Jul 14th, 2014 12:52 pm
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Lacost
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HI Marlin

 

There is a guy in Richardsbay that fiberglassed his gunnwales send me a PM and I will forward his mail with Pics he said it has got Catagory C rating as well.

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 Posted: Mon Jul 14th, 2014 12:53 pm
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Lacost
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here is a Pic of how it started out

Attachment: IMG-20140112-00296.jpg (Downloaded 208 times)

Last edited on Mon Jul 14th, 2014 02:11 pm by Lacost

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 Posted: Mon Jul 14th, 2014 12:58 pm
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marlyn
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Looks quite familiar ( basically exactly where I'm at currently, except for a stand-up console)

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 Posted: Mon Jul 14th, 2014 01:00 pm
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Lacost
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I cant get the end result pic to load keep getting an error

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 Posted: Mon Jul 14th, 2014 01:36 pm
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marlyn
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Lacost wrote:
HI Marlin

 

There is a guy in Richardsbay that fiberglassed his gunnwales send me a PM and I will forward his mail with Pics he said it has got Catagory C rating as well.


Hi,

I've sent you a PM with my e-mail address.

Thanks

Jürgen

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 Posted: Mon Jul 14th, 2014 02:09 pm
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Lacost
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reply mail sent

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 Posted: Mon Jul 14th, 2014 05:31 pm
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willem wikkel spies
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error could be that the pic size is too big.
resize and please post it so we can see!

the unique boats are is a pontoon boat where the pontoons were replaced by fibreglass

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 Posted: Mon Jul 14th, 2014 05:36 pm
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willem wikkel spies
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these the unique boats

http://www.gumtree.co.za/s-boats-jet-skis/unique/v1c9102q0p1

how the boat will change with the added weight is unknown to me

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 Posted: Mon Jul 14th, 2014 06:02 pm
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Lacost
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try again

Attachment: IMG-20140406-00486.jpg (Downloaded 180 times)

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 Posted: Mon Jul 14th, 2014 06:04 pm
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Lacost
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Another Pic The file name was too long

Attachment: IMG-20140403-00479 (2).jpg (Downloaded 181 times)

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 Posted: Tue Jul 15th, 2014 09:44 am
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marlyn
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I found a supplier for polyurethane foam.

Rigifoam can supply a polyurethane cylinder 300 or 400mm in diameter, 2,4m in length. The foam weighs in at 32kg/ cubic meter.

The plan is to basically glass these new rigid pontoons into place as a permanent fixture to the hull, thus changing it into something similar to the unique duck.

The pontoons could also serve as additional buoyancy because of the foam.

I would strengthen it in critical places (maybe fit some rod holders and bow / grab rails to the pontoons.)

My major concern is that the glass of the pontoon will not bond as it should to the existing hull.

Should I take off all of the existing gell-coat and roughen up the fibreglass of the hull where the overlap is going to be?

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 Posted: Tue Jul 15th, 2014 03:38 pm
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willem wikkel spies
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i do know that fibre glass resin stick to gel coat like shyt op n wol kombers.

had some resin drops that spat onto the gel coat, trying to remove these spots, caused indentations into the gel coat, thus the droplet removed took some gel coat with it everytime I removed a droplet

fibre glassing is not your problem I think. its getting the applied fibreglass surface smooth to the extent that it looks great and not good.

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 Posted: Tue Jul 15th, 2014 03:51 pm
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marlyn
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I'm planning to use woven roving instead of chopped strand mat, in my experience it is much easier getting a smooth finish with the roving than the chopped strand.

I'll first need to get my orbital sander fixed and stock up on some sanding discs...:)

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 Posted: Tue Jul 15th, 2014 04:00 pm
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Lacost
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what also helps  to smooth the resen out is to use wax paper, wax side against the resen and this alows it to smooth it fiberglass resen and even leaves a smooth shine

 

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 Posted: Tue Jul 15th, 2014 04:16 pm
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marlyn
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AMT Composites make a Water Based Acrylic resin:

http://www.amtcomposites.co.za/products/masterworks-green-technology/material-one-resin-powder

I used this stuff on a polystyrene cool box and I'm quite impressed with it.

It has strengthened the cool box tremendously with just a couple of coats of the resin on the box...and its water based.

The problem still remains - getting that smooth finish.

Here is another Air-less duck example:
http://www.parsunoutboards.co.za/max-airless-duck/?id=179

Another concern would be the stress that the joint between the hull and pontoon is under, in a normal duck the joint can flex to some extend.

If the pontoon is rigid this joint will be under severe stress when riding waves. I suppose it depends on the area where the pontoon is fastened to the hull.

Last edited on Tue Jul 15th, 2014 05:36 pm by marlyn

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 Posted: Fri Jul 18th, 2014 11:22 am
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johand
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.

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 Posted: Fri Jul 18th, 2014 11:23 am
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johand
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.

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