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Building the Frame
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Conduit (EMT) PVC comes in 10' lengths, one side with bell ends (built-in couplers.)
Cut 3 x 1/2" EMT PVC in half, selecting the bell ends. If not using EMT PVC, or the other 5' lengths, just use couplers.
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Further cut the pipes into 2.5' lengths.
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Tape a weight (a large lag bolt in this case) to the end of the rope, taking care to minimize the width. Taping it end-to-end like this helps.
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Assemble one non-belled and one belled section of 2.5' pipe into a pipe that approximates 5' in length.
Use the weight to thread the rope this pipe.
Go back and forth the length of the pipe five times, so there is roughly 30' of rope laid out. Save the excess.
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At other end of the rope, double it up appx 9" (doubled).
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Tie a double-overhand knot with the doubled portion
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If using 1/2" PVC and 3/16" rope, this will result in a knot too large to fit in the pipe.
Pull weighted end of the rope until knot is at other end of the pipe.
This is the left end of the first pipe.
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At the other end of the pipe, tie the second double overhand knot. Don't be overly generous with the slack, but no need to make it fiddle-string tight.
This is the right end of the first pipe.
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Lay the rope against the pipe.
At the first knot, tie the third double overhand knot in the rope only (do not tie it to the first knot.)
This is the left end of the first pipe.
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Drop the weight through the second pipe and pull it until it is against the third double overhand knot, the one most recently tied.
This is the left end of the first pipe (top) and second pipe (bottom).
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Flip the second pipe over, so the 5' length of exposed rope and the knot is on the other side.
This is the left end of the first pipe (top), and what was the right end of the second pipe, now moved to the left (bottom). From now on, we will refer to this end of the second pipe as the left end.
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Undo the first double overhand knot.
This is the left end of the first pipe (top) and second pipe (bottom).
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Lay the tail of the rope against the doubled rope from the first overhand knot.
This is the left end of the first pipe (top) and second pipe (bottom).
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Retie the first knot as a triple overhand knot.
This is the left end of the first pipe (top) and second pipe (bottom).
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Drop the weight through the third pipe and pull it until it is against the first knot (the triple overhand).
This is the left end of the first pipe (top), second pipe (middle) and third pipe (bottom).
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At the other end of the pipe, tie the fourth knot, a double overhand.
This is the right end of the first pipe (top), second pipe (middle) and third pipe (bottom).
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Cut the end off the weight
Lay the rope against pipes.
Mark where the pipe ends. This is approximately 5' of rope.
This is the left end of the first pipe (top), second pipe (middle) and third pipe (bottom).
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Bring the rope back to the other end of the pipes.
This is the right end of the first pipe (top) and second pipe (bottom). The third pipe is not in the picture.
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Undo the double overhand knot. In this picture, it is the third one, but undoing the second one will work as well.
Lay the tail of the rope against the doubled rope from the third overhand knot.
align the mark with the end of the pipe
This is the right end of the second pipe.
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Retie the third knot as a triple overhand knot.
This is the right end of the second pipe (top) and thirdpipe (bottom).
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Cut off any excess. There is none in this picture, but previous mobstacles had up to 3' of excess.
Lay another piece of rope, one at least 6' long, against the fourth overhand knot.
This is the right end of the third pipe.
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Undo the fourth double overhand knot.
This is the right end of the third pipe. The second pipe is barely in the frame.
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Retie the fourth knot as a triple overhand knot.
This is the right end of the second pipe (top) and third pipe (bottom).
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Lay the rope against pipes.
Mark where the pipe ends. This is approximately 5' of rope.
This is the left end of the first pipe (top), second pipe (middle) and third pipe (bottom).
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Bring the rope back to the other end of the pipes. Only the second overhand knot has not been turned into a triple overhand knot, so lay the mark near the the end of the first pipe.
This is the right end of the first pipe (top), second pipe (middle) and third pipe (bottom).
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Measure off appx 6" and cut.
This is the right end of the first pipe (top), second pipe (middle) and third pipe (bottom).
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Undo the second double overhand knot.
This is the right end of the first pipe.
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Retie the second knot as a triple overhand knot.
This is the right end of the first pipe.
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That's it. We're done (with the frame at least). When deployed, it looks like this:
Edited by taerKitty, 22 September 2011 - 11:45 AM.