2026-09-22T03:26:45Zhttps://dspace.mit.edu/server/oai/requestoai:dspace.mit.edu:1721.1/452972022-01-13T07:54:36Zcom_1721.1_7582com_1721.1_7581col_1721.1_131024
Alex Slocum.
Treadway, Shane M
Massachusetts Institute of Technology. Dept. of Mechanical Engineering.
Massachusetts Institute of Technology. Department of Mechanical Engineering
2009-04-29T17:22:04Z
2009-04-29T17:22:04Z
2008
2008
http://hdl.handle.net/1721.1/45297
311867853
Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2008.
Includes bibliographical references (leaf 20).
Between the years of 1953 and 2005, there were 253 fatalities from rappel failure/error. Some of these deaths may have been prevented if a stopper knot was tied at the end of the rope. Current climbing habits do not reinforce the tying of a stopper knot. More people are learning to climb in the gym and do not know risk reducing habits when beginning to climb outside, such as tying a stopper knot. The Hedgehog is a silicon device that reinforces the risk reducing habit of tying a stopper knot by a combination of form and color. A specially designed form aids in correct knot tying and the color signals the climber their attention is needed. When the Hedgehog was given to climbers in a climbing gym and had a success rate of 70%. Climbers without the Hedgehog had a success rate of only 8%. Success was defined as having a stopper knot in the rope when the climber began to ascend the route.
by Shane M. Treadway.
S.B.
20 leaves
eng
Massachusetts Institute of Technology
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http://dspace.mit.edu/handle/1721.1/7582
Mechanical Engineering.
A silicon-cast device that aids in securing rope ends by ensuring a figure-eight knot is tied for use in gym and rock climbing
Thesis
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<Abstract>Between the years of 1953 and 2005, there were 253 fatalities from rappel failure/error. Some of these deaths may have been prevented if a stopper knot was tied at the end of the rope. Current climbing habits do not reinforce the tying of a stopper knot. More people are learning to climb in the gym and do not know risk reducing habits when beginning to climb outside, such as tying a stopper knot. The Hedgehog is a silicon device that reinforces the risk reducing habit of tying a stopper knot by a combination of form and color. A specially designed form aids in correct knot tying and the color signals the climber their attention is needed. When the Hedgehog was given to climbers in a climbing gym and had a success rate of 70%. Climbers without the Hedgehog had a success rate of only 8%. Success was defined as having a stopper knot in the rope when the climber began to ascend the route.</Abstract>
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