Make sure your loops stay anchored around your broom handles.The second, known as an 'onager' or torsion catapult, gets its power from a rope-like bundle of animal sinew and hair. The ballista was invented by the Greeks in 399 B.C.E. To achieve the tension necessary to throw a projectile, you must finish lacing by going through the frame holes, around the broom handles in loops, and over and under the throwing arm. The first, called a 'ballista' or tension catapult, looks like an oversized crossbow and works on the same principles, generating force from the tension of the bow arms. After securing your rope to arm and frame, you should not continue threading your line through the throwing arm.The more twists you add through your over and under motion, the more tension and greater force your catapult will have. A video posted in late March with more than 33 million views shows Rober unleashing his creation of multiple people working as part of a phone scam operation. This should form a figure eight shape with your rope where you can clearly see the rope twisting together.Continue this motion, following each over-lacing of the arm with an under-lacing with each pass of the cord through the frame. After you have run your cord through the base of your catapult and throwing arm several times to secure it to the frame and arm, starting with your second handle, bring the end of your cord around the second handle in a loop that passes through the hole in your frame and under the throwing arm, passing through to the hole on the other side to loop around your first handle. Use an over under motion to complete lacing.
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