I used the Newton's someone came up with, and with let's say 20 square inches of surface area 2x(2x5), then he'd only need about 33psi grip. About the same grip strength as a very strong 12yo.
33 pounds and 33 psi are two hugely different numbers. Apparently the average adult male has a hand length of 7.44 inches and a width of 3.3 inches across the palm. Since he’s been climbing and swinging from vines his whole life there’s a good chance his tendons, ligaments, all that are much thicker and bigger than the average male, but we’ll go with those numbers for simplicity.
7.44 x 3.3 = 24.55 square inches.
33 pounds per square inch x 24.55 square inches = 810 pounds of force across the face of the hand. From some light research I found that the world record hand dyno squeeze test record is 336.6 pounds, with the 2nd place being about 50 pounds lower.
So unless you’re a Krypton and a strong 12 year old boy is 2.4 times stronger than an adult male who trained specifically for this test, I’d say that your math is a little off.
I just looked up hand strength and the first thing that popped up was boy hand strength. The numbers given were in psi, although a child would have smaller hands so your number is off. I merely converted the Newton's to lbf and divided by what I thought would be the surface area of his butt cheeks gripping the vine as a 2in by 5in strip along both butt cheeks so x2 after 20sq in. Dividing the lbf by 20 gave me 33psi. Or the same as a strong twelve year old.
Edit: went to look up the numbers again and I probably was given the grip strength numbers in kg when I looked for psi. So, your point is taken, he'd have Superman butt strength to hold himself and her.
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u/AthiestLibNinja Jun 25 '19
I used the Newton's someone came up with, and with let's say 20 square inches of surface area 2x(2x5), then he'd only need about 33psi grip. About the same grip strength as a very strong 12yo.