With Instructables you can share what you make with the world, and tap into an ever-growing community of creative experts. I'm starting this topic to both log my experiments and to petition contributions and ideas from others. This is trivial but, still something to consider.The greater the airpressure in the inflated chambers, the stiffer the vessel will be.
My thoughts for the initial design are (loosely) based on using the RB-15 while in the Army.
One of the objectives of this project is to create something that can be built with readily available (and low cost) materials.
I'm starting this topic to both log my experiments and to petition contributions and ideas from others. The basic premise, to build a strong, inexpensive inflatable boat.
I am trying to figure out how to cut out the material to make the cones on the front and back of each tube and seal them correctly.
A big thing with the canvas was to try to have something that could be built with a trip to a local hardware store. Why not impregnate the canvas with silicone caulking like the kind of stuff you would use around a bathtub or shower.
A couple years ago I priced epdm rubber roof coatings in bulk 5 gallon pails for around $150. If the main negative factor of the low buck little inflatables is sturdyness, why not just make a strong material cover to go over one you have, maybe have long patch of tear proof material built onto the outside of the cover, and be sure to rely on the strong areas when you have to board on some nasty bank.
I had a cheap little inflatable that I fished in off and on for a few years -- Sevylor, made in France.
Another abrasion and snag shield idea that crossed my mind is using some of that roll-rubber they use for commercial roofing.


Determining the air pressure to use will come from a combination of material strength and size of the chamber.
Before I build mine I made a lot of research over the internet but I never saw the Soar Cat.
Its beginning to look like a hardware store version of this may be more difficult than planned.
A plywood floor of the size and design desired would form the platform and the floating bit would be comprised of canvas tubes (old blue jean legs) sewn together and filled with sprayed expanding foam insulation. Even the lower cost (smaller) inflatables at WestMarine sell for over a thousand and go up.
I used 18oz material, its good for lakes or big waters but if you want to go whitewater I recommend 35oz or 40 oz. I think the author of this article is looking for something a little more rigid, as would I.
My basic plan is to use some heavy canvas, and impregnate it with something to make it air tight. While the tarp material resellers will tell you to use a heat gun, etc, you can make life easier using specific glues. Conversely, the advantages over a pure inflatable are it's sleek shape, clean entry, and good performance. The canvas should add plenty of strength allowing it to hold a little bit of pressure and stay rigid. Here are some links were you can buy the material: (This guys have good deal on material but the sell only black for 22oz and big roll 50 yards to 70 yards. I am going back to fishing since retired and I want to get a little 10 ft jon boat, no bigger.I want to take my dog with me sometimes and plan on just getting away from shore in lakes and ponds.


Everyone I've spoken to about this project has responded either that I'm crazy (possible), this is impossible (I'll never believe it), or both. Lets start with the base material.
If material costs are kept low, the cost part may not be a big deal.A quick and dirty method of measuring the strength of the material is to cut a one inch wide strip to a length equal to the desired circumference, plus a little bit for hangers. I find Microsoft paint is the easiest when it comes to taking screen snapshots for the above method and having to crop them.
I am really thinking of using a heavy canvas, like the kind available at the hardware store as painter's drop cloth. Purchased like that, I can get large pieces of canvas that are very sturdy and inexpensive. So, I think its a good starting point. Next up, a low cost way to make the canvas air tight and durable. I have used a inflatable fishing chair off the coast of Saudi Arabia in the red sea (not again) and did grow up in the intercoastal waterway in Fla, but not that fond of swimming.Anyway sorry to run off at the mouth but wanted to say thanks for the read. I have experimented with "PlastiDip" stuff used to plastic coat tools, and "liquid electrical tape" but, these two substances are hard to the saturate fabric with. Probably just as well, as these would be pretty expensive in the quantity required. I really think that a liquid vinyl or some kind of vulcanizing compound would be ideal.




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