I reviewed your calculations and find them lacking as well. Your rate of fill per tire is light because you are not utilizing the center open...
how much would the marine grade basket cost ?..... Isn't the whole premise of the exercise to make the least expensive but practical design ?...
Given that the first drawing was a bit off the top of my head, I'll grant you that it's not the optimal version. The second drawing is much more...
I find your troll replies quite amusing. I would have guessed that somebody who knows it all would know that 15" culvert pipe is very durable...
The idea could also be modified like this : [IMG]
Large diameter posts would not need to be structural. A 15" diameter plastic culvert pipe would function to hold the ballast within the tires....
Center post should be about 1" smaller diameter than the hole in the tires... 1/2" gap would allow water to flow but keep flotation trapped...
Here is another idea that is more in line with what you are trying to do: [IMG]
I'm probably late to the party here, but I could show you a few ideas I've used to make "junk" flotation practical. (if your concrete flotation...
Umahunter, In my line of work when I need a large scale curve I simply take a square and hot glue straight scraps of wood to it that are long...
Perhaps I should have included "or sliderule" in the sentence? I'm obviously a beginner to the boat building game as well. I would love a quick...
Assuming you don't have the aid of a CAD program, I would do it similar to sewing a fabric pattern shape. A flat boat like you have pictured...
Sealing pop rivets are fairly common. You will want to over seal them anyway regardless of type. Here they are on McMaster Carr:...
I've made several like this: http://i1166.photobucket.com/albums/q602/gumphaugh/DSC00951.jpg
