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This modern Catapult has a ratcheting winch that can control the distance projectiles are thrown. Crank the winch to its maximum tension and you can hurl balls over 10 feet! This cool construction set teaches kids important lessons about variable shot power and how machines store kinetic energy. Includes more than 100 easy-snap pieces, 2 balls, and instructions for 2 alternative builds.
What I did notice, however, was that the ball had way too much power directed in the wrong direction - so I do believe that with correct geometry, a backward launcher could also be done with just 1 piston like John's. I know it's not clear what I mean by having a forward launcher geometry flinging backwards instead, but it's late, so I'll let Aaron or Ruiqi explain for me if anybody has questions.
This modern Catapult has a ratcheting winch that can control the distance projectiles are thrown. Crank the winch to its maximum tension and you can hurl balls over 10 feet! This cool construction set teaches kids important lessons about variable shot power and how machines store kinetic energy. Includes more than 100 easy-snap pieces, 2 balls, and instructions for 2 alternative builds.
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The VEX Catapult Toy helps you to introduce children to the world of STEM (Science, Technology, Engineering and Mathematics) through play. It has 100 pieces that are simple to put together and which stay in place for long-lasting models. This product comes with plans for three different sets, a race car, a trike and a catapult. The two balls provide ammunition for shots. Simply place one in the basket, crank the winch and fire. It has wheels that make it easy to roll around. You can use the parts to create models from your own imagination for even more creativity and fun. Use this toy to teach physics principles, as well as a history lesson as you describe how this Greek invention helped to modernize society.

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Kids can put on their engineering hats and build the Vex Robotics Catapult, which launches plastic balls up to 10 feet. It comes with more than 100 easy-connect snap pieces and two balls. Once the catapult is assembled, turn the knob to bring the bucket of the catapult however far back you want. Use the launching lever to lock the bucket into place once the bucket has reached your desired angle. You can also change the angle at which the ball will fly by adjusting the T-shaped piece in the middle. Once set up, load a ball into the catapult and press down on the lever to launch. You can also drive the catapult around on its real-rolling wheels. 

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