2 cos ( ) θ 2 200 lbs 0° 100 lbs 200 lbs 90° 141 lbs 200 lbs 120° 200 lbs 200 lbs 45° 108 lbs 150° 200 lbs 386 lbs t = L L = load suspended from the anchors.

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Presentation transcript:

2 cos ( ) θ lbs 0° 100 lbs 200 lbs 90° 141 lbs 200 lbs 120° 200 lbs 200 lbs 45° 108 lbs 150° 200 lbs 386 lbs t = L L = load suspended from the anchors θ = enclosed angle between the anchors t = tension on each leg (and each anchor) Force = 282 lbs 100 lbs 108 lbs 141 lbs 200 lbs 386 lbs 170° 200 lbs 1147 lbs Force = 216 lbs Force = 400 lbs Force = 772 lbs Force = 2294 lbs Force = 200 lbs

Kilonewton (kN) Pounds/Force (lbf) 1 kN = lbf kN lbf , , , , , ,736 Military steel oval carabiner….……….… 9kN 6mm accessory cord (loop strength).… 10kN Commercial climbing harness.…….….. 15kN 1-in tubular webbing (loop strength)….. 18kN Aluminum oval carabiner…………….… 18kN 8mm accessory cord (loop strength)…. 19kN Military 7/16-in. nylon climbing rope….. 20kN Aluminum D-shaped carabiner………... 24kN 11mm dynamic climbing rope…………. 24kN 11.6mm low-stretch (static) rope…..….. 29kN Military steel locking-D carabiner……… 53kN

Comparative strength of rope and webbing as used in anchor systems. All strength values shown in Kilo-Newtons (kN). Unknotted Knotted Loop Double Loop* 6mm Accessory Cord mm Accessory Cord mm Accessory Cord mm Spectra Cord in. Tubular Mil Spec Webbing in. Tubular Climb Spec Webbing Military 7/16-in. Laid Dynamic Climbing Rope mm Kernmantle Dynamic Climbing Rope mm Kernmantle Low-stretch Rappelling Rope Sewn Spectra or Dyneema Runner (14 –16mm) Enclosed Angle / Load Factor Strength of Webbing Installations Using 1-in. Tubular Mil Spec Nylon Webbing < 45° 1.00 Wrap 3 – Pull 2 42 or more depending on anchor diameter and friction 45 °.92 Girth Hitch 18 to 24 depending on knot location and friction 60 °.86 Wrap 18 × (load factor of enclosed angle) 90 °.71 Drape 36 × (load factor of enclosed angle) 120 ° ° °.09 Conversion Factors 180 °.00 Weight: 1KG = 2.20 lbs1 oz. = 28.3 grams Length: 1M = 39.4 inches1 inch = 2.54cm Force: 1kN = 225 lbf