Thank you to all those who entered our Swag Giveaway!
Congratulations to all who answered this correctly! We are always impressed with the knowledge that many of you off-roaders possess, good job!
1) Vehicle sees 20,000 pounds of pulling force
2) Vehicle traveled 3 inches
3) 4X mechanical advantage
Both rope legs on pulleys have the same tension, so Pulley #1 sees 5K on each leg for a 10K total load. That means that the right leg on Pulley #2 sees 10K, and so does the left leg, the anchor then sees 20K. So the total pulling force to the vehicle is the sum of these loads – 10K+5K+5K = 20K. From the conservation of energy : 5K x 12 inches = 20K x 3 inches. In other words, pulling 5K for 1 foot is the same amount of work as pulling 20K 3 inches.
It’s true that most of us will probably never need to rig a vehicle with this “Spanish Burton” method, but its still interesting to know it’s possible to reach a 4X mechanical advantage with only 2 pulleys and a length of rope or cable. The common use of two pulleys typically results in merely a 3X advantage, not 4X.
Big congrats to our FB Winner, Alan Hamel and IG Winner @sheepythejku
Stay tuned for new products and more giveaways!
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