Difference between revisions of "User:Vincecate/Pipe Spar"
| Line 4: | Line 4: | ||
At 36 inches diameter it is about 287 cm in circumference. If we have a pipe 150 meters long this is 8*287*150*100=34440000 grams or 34,440 Kg. Stainless costs around $5/Kg with a pipe being a bit more than this. | At 36 inches diameter it is about 287 cm in circumference. If we have a pipe 150 meters long this is 8*287*150*100=34440000 grams or 34,440 Kg. Stainless costs around $5/Kg with a pipe being a bit more than this. | ||
| − | If we have 20 meters above water we have 130 meters underwater. Displacement for 3 foot diameter pipe is 1.5*1.5*3.141592 = 7.069 cubic-feet per foot of pipe. With 426.5 feet underwater and each cubic foot of water is 60 lbs, then 7. | + | If we have 20 meters above water we have 130 meters underwater. Displacement for 3 foot diameter pipe is 1.5*1.5*3.141592 = 7.069 cubic-feet per foot of pipe. With 426.5 feet underwater and each cubic foot of water is 60 lbs, then 7.069 * 426.5 * 60 = 180,885 lbs or 82,048 Kg. |
| − | After taking out the weight of the pipe, we have 82,048-34,440= 47,608 Kg for ballast and living space. If we use half for ballast then we have | + | After taking out the weight of the pipe, we have 82,048-34,440= 47,608 Kg for ballast and living space. If we use half for ballast then we have 47,608/2 = 23,804 Kg for living space. |
Could use a thicker pipe and still have interesting size living space. Can also brace the joint between the pipe and the living space. Lots of lift really. | Could use a thicker pipe and still have interesting size living space. Can also brace the joint between the pipe and the living space. Lots of lift really. | ||
Revision as of 03:44, 10 June 2008
Looking at Red Hawk Spar and thinking about using standard pipes to make a spar.
Lets look at 36 inch sched-40 stainless steel pipe. This is probably 0.375 inch thick (nearly 1 cm). The density of stainless steel is about 8000 Kg/m^3 or 8 grams/cc. At 36 inches diameter it is about 287 cm in circumference. If we have a pipe 150 meters long this is 8*287*150*100=34440000 grams or 34,440 Kg. Stainless costs around $5/Kg with a pipe being a bit more than this.
If we have 20 meters above water we have 130 meters underwater. Displacement for 3 foot diameter pipe is 1.5*1.5*3.141592 = 7.069 cubic-feet per foot of pipe. With 426.5 feet underwater and each cubic foot of water is 60 lbs, then 7.069 * 426.5 * 60 = 180,885 lbs or 82,048 Kg.
After taking out the weight of the pipe, we have 82,048-34,440= 47,608 Kg for ballast and living space. If we use half for ballast then we have 47,608/2 = 23,804 Kg for living space.
Could use a thicker pipe and still have interesting size living space. Can also brace the joint between the pipe and the living space. Lots of lift really.
