Instructables
Here's a raft I made a couple years ago to navigate the toxic waters of the Chicago area when i lived there. There are a couple holes in my documentation of building this, I didn't know about instructables at the time, so if you are unclear about anything let me know and I'll try to edit it.
 
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Step 1: Cutting the pieces.

So I found these three 4X8X2 Extruded Polystyrene sheets in a dumpster, the ends were all raggedy and busted so I cut them down to six feet long. Good luck finding your sheets in a dumpster however, I've never found this many relatively full size foam sheets anywhere ever again...sorry to say. Anyway, cut them up into one foot wide sections.
could you use hot glue? or would that not work
Looks like a pretty nice raft! I built one a couple summers ago from some salvaged lumber, miscellaneous bits and bolts, and a couple purchased items. The pontoons were each a double-row of empty freon tanks (about the size/shape of the small propane tanks, but much lighter, since they are made to not be refillable) attached with plumber's tape. I got the tanks for free from a guy who does/did (retired now, I think) commercial refrigeration. What were some of the voyages made with this fine craft? After the illustrious plans for a 3-day, 3 or 4 man trip ~60 miles down the supposedly dangerous Wabash River fell apart due to other crew members withdrawing, it sat dry on the banks of a local lake for almost a year, at which point it was moved into the landlocked lake, and a few days later, towed across to its current resting place.
MN218 (author)  sleeping_gecko6 years ago
My first raft I ever made was made with freon tanks, I had the good luck of growing up with a welder on hand so that made it easier I think. This fine craft just did some small trips down rivers and canals around chicago, I even got it licensed, which I though was pretty funny.
lol
teslafan1003 years ago
How much do you think the polystyrene sheets would cost?
hey i was just wondering, do you have an aproximate load limit for this?
Probably about 3840lbs. It's volume of hull(s)*40 to 50 - this gives you the amount of weight it would give you when just below the surface of the water. So I halved that and got 3840 :)
aedman4 years ago
Stumbled upon this. You are everywhere! I seem to remember the raft working better than the antique motor...
Squid Tamer4 years ago
I've always wanted to make a raft, but I don't live anywhere near a lake (Or at least one with boats).

I do have a small stream in my back yard, but it's only a foot deep at most, and is about an inch deep in others... Still want to try, though.
Bando_Red5 years ago
Any idea of its weight limit before it sinks?
I have a question. I was wondering where did you get the glue that you used because I can't find it anywhere.
MN218 (author)  ChaosJile1195 years ago
I got it at a home depot in Chicago, it's specifically for gluing pink foam. I just wandered around by the calking tubes reading them all until I found something that seemed good, maybe ask somebody at the store. Good luck!
I see. I was thinking to use construction adhesive but it didn't say if it would work on polystyrene. It'll probably be a while before I build this, I'm just figuring out supplies now so it will be easier when I do build it. Thanks for your help!
dciocoiu5 years ago
you should join my group this will make an great thing.
CameronSS6 years ago
Nice! It looks like you got a nice little cheap-and-dirty raft to mess around with...and...hmmm...let's see, I could mount a jet-ski motor underneath, I could make an air boat, I could mount a big acrylic box that could be lowered to provide a reverse periscope...No, wait a minute...that's it! Find a small tent that is sized right for it, and have a tiny little houseboat! Or, haul your boat ashore, and use it as an elevated campsite! Man, what a cool little experimentation platform! Hint: add some instructions. Yes, I saw the notes on the images, but some steps are somewhat vague, e.g., Step 3 appears to be making a single super-tall pontoon, and Step 7 appears to have unmentioned slots cut in the foam to fit the boards. Overall, great Instructable, especially for your first! I'd definitely build one if a) we lived near any water, b) I had any use for it, and c) I didn't sink to the bottom of any body of water, even with some lifejackets.
MN218 (author)  CameronSS6 years ago
Thanks for the input, I'll take a look through the instructions again.
Oh, and a suggestion for cutting the foam...use an electric knife. They cut fast enough that they are usable, but slow enough that you don't lose control or melt the foam.
tyeo0986 years ago
Couldnt you use a weed-whacker as the motor (if there is no outboard handy?)
MN218 (author)  tyeo0986 years ago
I've been curious about just that for a long while, my guess is that yes you could (if you put a propeller on the end of course)
marc92 tyeo0986 years ago
I bet you could if you modified the part that actually cuts the weeds and made it into a propeller you also might need to modify the shaft of the weed whacker depending on design of it
Yeah my friends and i are making a raft/boat thing and I'm trying to make an outboard type motor using a whipper snipper someone was chucking out at the council cleanups. I've got a small fan blade for the propeller that someone else was chucking out at a different time. If it doesn't work i might try to make one out of some sheet metal from school. I also had to file a bit of plastic away to be able to turn the shaft around and drill a new hole to screw it in. i might put some pictures on if i ever finish it. Nice raft too
Cool! Cant wait to see the pics.
logic bomb6 years ago
Pretty Cool!! Low cost. I love it...
i would love to build this, if the closest lake wasn't so far away...
ll.136 years ago
nice!!
John Smith6 years ago
I never thought of using foam sheet for a pontoon....good idea.
Very cool..and I like the vest, too!
Sweet! Is the tat on your arm real, whats it mean?
Awesome!
xboxteen016 years ago
pretty cool
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