in need of help

i have 2 30"x 20' pipes if icap each end how much can my cabin weigh? pipe weighs 80 lbs a ft

[duluthboats]

In round numbers,

Area of the end of your pipe, 3.14 * (15 *15) = 706 sq in.

Volume of one pipe, 706 * 240” = 169,646
169,646 / 1728 = 98 cu ft

Displacement of one pipe, 98 * 64 = 6,272 lbs

6,272 – 3200 = 3,072 lbs, after subtracting the weight of the pipe.

If your cabin doesn’t exceed 3,000 lbs with everything included, your floats should be near the half way point. I’m sure someone will point out any errors; I’m still on my first cup of coffee.

Gary

[Tom Lathrop]

Gary,

I misssed out on a lot of math by gazing out the window too much but I think there may be something wrong with the calculation.

Tom

[duluthboats]

I knew someone would help. I hope I'm closer now. My math is bad even when I'm awake, that’s why it says amateur.

Thanks Tom

Gary

[TheFisher]

Gary,
You're close but no cigar again

Volume = pi r squared h
= 3.14 * (15 *15) * 240 = 169,560
= 169,560 / 12 cubed = 98 OKAY so far

Displacement of one pipe, 98 * 64 = 6,272 lbs Yep!

Displacement of 2 pipes = 12,544

Weight of 2 pipes = 2* (80 * 20) = 3200 lbs.

12,544 - 3200 = 9,344

Total weight may not exceed 4672 lbs to float at the halfway mark.

Unless, of course I made a mistake, which I'm known to do from time to time.