This semi-final contest pits previous winners the Super Chargers against the High Flyers. All they have to do is launch Tyler's shorts the farthest. Simple, right? Very simple except Tyler's shorts are inside a 150 pound washing machine. Each team gets three tries to throw the washing machine the farthest. No engines are allowed so they will have to figure out a way to store the energy then fling the washer forward. Whoever gets it the farthest advances to the finals.

The Super Chargers want to build a catapult. With a truck frame for a base and a large steel arm attached to a winch to pull it back, they will fling their washer forward. By twisting steel wire around the base of the arm, that will store the power to fling the washer. It's a simple design but finding enough steel wire (that is in solid condition) could be tricky. Also, the welds will have to be super strong because the forces will be massive when the arm is winched back.

Initially the High Flyers were going with a massive slingshot. By attaching cord to the leaf springs on a car (all attached to uprights on a solid base) a lot of power could be stored and let go. The team didn't think they could find big enough leaf springs so they're going with a trebuchet. We've seen many trebuchets before, but a quick run down anyway. Two a-frames support an arm with a big weight on one end and the washer hooked to the other end. The weight swings down and the washer is flung over the top and forward. It's gonna be big and it's gonna have to be strong.