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 Post subject: Floats
 Post Posted: Sun Apr 13, 2014 5:59 pm 
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Well I started my float build for my 4" and 2 1/2" dredges. Since my surgeries I don't know how much I will be able to shovel so I had to make sure my dredges could float. I am using Doc's method that he posted on the old GPAA forum. So I am hoping according to his calculations that he posted the ones for the 4" should float 640 lbs and the ones for the 2 1/2" will hold 320 lbs. I have to put a cross member to stablize the floats. I will be covering them with Flex seal to help protect them...


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 Post subject: Re: Floats
 Post Posted: Sun Apr 13, 2014 10:00 pm 
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Joined: Thu Jul 11, 2013 3:02 pm
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Location: Murrayville, Ga.
I'm not an expert by any means in dredges but just from what I have learned I would have some concern about the height of your sluice box and flare from the water level as I know it can affect the ability of the pump to lift?


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 Post subject: Re: Floats
 Post Posted: Sat Apr 19, 2014 10:42 am 
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Joined: Sat Nov 03, 2012 9:48 am
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What's the float material? Looks to be some kind of Styrofoam material.


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 Post subject: Re: Floats
 Post Posted: Sat Apr 19, 2014 11:15 am 
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Joined: Wed May 30, 2012 9:02 am
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Location: Iowa
I'd say its 150 Rigid Foam Insulation comes in 4'x8' sheets up to 3" thick.
http://www.foamular.com/foam/products/foamular-150.aspx

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 Post subject: Re: Floats
 Post Posted: Sat Apr 19, 2014 4:58 pm 
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Joined: Mon Oct 29, 2012 11:38 am
Posts: 381
I did a hack job of gluing together all the styro from all my computer boxes. I then cut them in the shape of a shark-then painted it like a shark. It was fun and it works.


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 Post subject: Re: Floats
 Post Posted: Sat Apr 19, 2014 10:15 pm 
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Joined: Sat Nov 03, 2012 9:48 am
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Hmm, I may have to try this, I used 6 30gallon barrels and while they work great for extreamly fast flowing water ie: dredging in white water rapids, they take up way to much space in my trailer.


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 Post subject: Re: Floats
 Post Posted: Sat Apr 19, 2014 11:47 pm 
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Yes it is the pink foam board. Doc had posted this on the old GPAA forum board. He said that this foam board would float 10 lbs per square foot. My floats are 8 ft long by 12 inches wide so they works out to 8' by 12" so each strip would support 80 lbs times 4 strips equals 320 lbs per float or 640 lbs for both and they dont weigh very much. So i can take the frame off for easy transport. Now I have to make sure i have centered when i have the motor mounted......


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 Post subject: Re: Floats
 Post Posted: Sun Apr 20, 2014 12:26 am 
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Location: Iowa
Wow omnicron that's a serious looking setup 6"?

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 Post subject: Re: Floats
 Post Posted: Sun Apr 20, 2014 5:25 pm 
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I found the original post so I will post it here:

Figured I'd post this too.
This is what we use on our main float.
2" thick and closed cell.
I tested one square foot in the sink and it held at least 10 pounds buoyant.
So... each outrigger
12" x 5 feet = 50 pounds.
3 layers thick = 150 pounds
2 outriggers = 300 pounds
We stacked the 3 layers then "sandwiched" together with plywood and long bolts.



http://www.homedepot.com/Building-Mater ... OJJLsV4N8E


ive been messing around with making light wht floats with that stuff for a couple of years now. finally came up with a good method after some trial and cussing.
i now use water base contact cement to glue layers together. dosnt eat the foam. you have to clamp them when using this glue. i use two 2 x 12s one on top and bottom. then five bar clamps on each side on top of 2 x 4s that go across the 2 by twelves top and bottom, 90 deg to the foam and 2 x 12s. ive cut the foam on table saw to 12 ,14, or 16 inches or what ever you want. then glue both sides and clamp them all at once over night.
then i take my belt sander and sand them smooth and true to each other. less sanding if you cut and line them up good before gluing. then i take my router and put a nice 3/4 round over on all the corners.
after that i wrap them with the new moist stop tape that they use in window installation. wrap them with the 12 in wide tape one layer. they have been in the river for a year now and holding up really well. ive got some pocks from branches but no damage. ive had pieces glued together just sitting out side for a year now too. i can not break them apart. another good thing is they are supper light. i made them 6ft long by 12 by 12 inches for my 4 in dredge. the old keene pontoons were shot after 15 years. i can carry four of these pontoons to one keene pontoon. the whole dredge moves around better on the water too. i hope this helps some trying to make there own pontoons. oh ya the whole project cost me $110.00 for two pontoons. it also helps on cost if you can get them in 4ft wide by 2 inches. less waist.

i made two pontoons 6ft by 12in wide by 10in deep for 115.00 .
1. three sheets foam 2 x 8 @15.00ea. = 45.00
2. two quarts water base contact cement @ 15.00 ea. =30.00
3. two rolls 6in window wrap tape @ 20.00 ea = 40.00
total investment. 115.00 for two pontoons. i glued the scaps into the middle of each pontoon with no ill affects.


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 Post subject: Re: Floats
 Post Posted: Sun Apr 20, 2014 10:23 pm 
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Joined: Sat Nov 03, 2012 9:48 am
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Thanks Frank! Sure beats $1000 for a set of pontoons from keene or proline.
This will be on my list of changes as soon as I can get out dredging and make some money.
Thanks Weary, after losing my job last year I decided to be my own boss and dredge for a living!


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