K'nex Torsion Catapult

[IAMLEGEEND1]

its good but u need a box at end so u can put the little blu rings in,small marbles or bb's

[Myles0Harcourt]

very nice

[megamaniac1]

ive built it its really simple but very strong its fun to play with

[superkrotz12345]

can i have directions

[mwjscn]

If you read the comments you would know that I don't have instructions. My brother made it on a whim and figured it out as he went. It has probably long since been destroyed.

[pelster93]

i made one the only thing i had problems with was the rubber band so i couldnt finish it

[Srlancelot39]

@pelster93 actually, to be authentic you would just use regular rope/string since they did not use elastic material in the medieval times. when done properly, you can get a lot of force using rope. The torsion causes compression in the rope. the reaction is the energy being released by the untwisting of the rope.

(yeah, elastics are easier, but its not realistic =P)

[dudeontherun83]

try to make a basket for it so you can launch more stuff

[BwjGrexxisS]

What means torsion?

[mwjscn]

Torsion is the means by which the arm is pulled back into the ready position.

[xiaohawk]

I thought torsion is a twisting force. In this case, torsion powers the arm to swing forward because the rubber bands are placed around the arm, so when the arm is pulled back, the rubber bands tighten.

[Srlancelot39]

@BwjGrexxisS torsion is a twisting force

[mcfurf]

kool! im gonna try and make one

[brightshadow55]

DOOD! post instructions!

[mwjscn]

I don't have any instructions for it, so you're going to have to try and build your own. It looks pretty basic, just try and make one up from the movie footage.

[brightshadow55]

after watching it a few times, I finally got it :D this thing PWNS!!!

[sup1345]

build a large scale version of that and u'll be able to reek havok on stuff

[maddogdude58]

nice idea