Climbing Gear Specificat
Olan Watkins (76207.3431@COMPUSERVE.COM)
Sun, 6 Apr 1997 18:24:44 EDT
Re your question on the specifications on some of your climbing gear, I
believe you said the D rings were rated at 25 KiloNewtons or something
like that. That seems like a somewhat strange way to rate them, but I
don't know for sure.
The Newton is defined as the force necessary to accelerate 1 Kilogram to
1 meter/second square, 1x10**5 Dynes, a Dyne is the force to accelerate
1 g to 1 cm/sec*sec.
As a practical matter, I would think that the most you could fall,
assuming that your rope or D rings do not break, is the length of your
rope. Assuming a rope length of about 125 feet or 40 meters to make it a
little more simple. At most, I don't think it would take over 5 seconds
to fall that distance, so that when you hit the end of the rope you
might be moving at around 150 feet per sec or 46 meter per second. If
the person weights 100 KG, about 220 pounds, unless I have missed
something someplace, that would seem to come out to about 4.6 kilo
newton of force to stop the fall. If I have not missed something
someplace, that would seem that your gear has plenty of safety margin.
Good luck, Olan
Terry Howerton Sakima Group, Inc. SCOUTER Magazine Kansas City