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My son received this as a birthday present when he was 4 years old. He was able to build most of this himself, with me reading the instructions for him. He loves playing with this and often takes it apart to build the car and different versions. Since then, I have ordered additional sets to give as gifts to his friends who are turning 5-10. This is a great alternative to Lego. This holds together very well and does not fall apart when he or his friends are playing with it.
In addition if someone has a 4/4/2 (four motor drive, four lift, two intake) setup then having 4 tanks on your robot for a backwards catapult is a lot of weight. The tanks aren't light so keeping your robot as lightweight as possible with only four motors on drive is essential. But then again team 1103 in Round Up had a rock solid robot that weighed nearly 20 lbs. (I believe he said this in a video somewhere, don't quote me on it) and had only 4 high speed motors on his drive. Very impressive!
VEX Catapult Construction Kit has a SKU of VEXCATPLT a product ID of VEXCATPLT and a Global Trade Item Number (GTIN) of 0807648042115 This VEX Catapult Construction Kit comes with everything you need to build your own working catapult. There are 2 balls included so once you've done constructing you can have fun playing with your creation. Vex Robotics brand. VEX Catapult Construction Kit is rated 0 out of 5 by 0 reviews. 0 is the minimum rating. VEX Catapult Construction Kit for the price of $29.00 in category at Officeworks https://www.officeworks.com.au http://www.facebook.com/officeworks http://twitter.com/officeworks http://www.instagram.com/officeworks http://www.youtube.com/user/officeworks
$ Australian Dollar R$ Brazilian Real £ Pound Sterling $ Canadian Dollar $ Chilean Peso ¥ Chinese Yuan Renminbi Kč Czech Koruna kr Danish Krone € Euro $ Hong Kong Dollar Ft Hungarian Forint ₹ Indian Rupee Rp Indonesian Rupiah ₪ Israeli New Shekel ¥ Japanese Yen ₩ Korean Won RM Malaysian Ringgit $ Mexican Peso ƒ Netherlands Antilles Guilder $ New Zealand Dollar kr Norwegian Krone Rs Pakistan Rupee ₱ Philippine Peso zł Polish Zloty py6 Russian Ruble $ Singapore Dollar R South African Rand kr Swedish Krona CHF Swiss Franc NT$ Taiwan Dollar ฿ Thai Baht ₺ Turkish Lira $ US Dollar
For our catapult design, we actually took inspiration from Aaron and 7090 in order to create the same degree of rotation as the forward catapults, but backwards. It was also designed to only catapult large balls, as many times it was more useful to keep the buckyball and only fling the large ball. Our season has ended until March, but we ended up not having enough space to have the actual deflection we wanted (60 degrees), and went with something more like 80 degrees, which was not optimal. To add to that, the trajectory was not tuned, so the ball would go much, much higher than we intended. As a result, we just decided to throw pistons at the problem (we had 5 single action pistons, equivalent to 4 double actions), to solve it quickly before our last competition. It worked well, but obviously not as well as we wanted it to.
For our catapult design, we actually took inspiration from Aaron and 7090 in order to create the same degree of rotation as the forward catapults, but backwards. It was also designed to only catapult large balls, as many times it was more useful to keep the buckyball and only fling the large ball. Our season has ended until March, but we ended up not having enough space to have the actual deflection we wanted (60 degrees), and went with something more like 80 degrees, which was not optimal. To add to that, the trajectory was not tuned, so the ball would go much, much higher than we intended. As a result, we just decided to throw pistons at the problem (we had 5 single action pistons, equivalent to 4 double actions), to solve it quickly before our last competition. It worked well, but obviously not as well as we wanted it to.
This construction kit challenges you to build a fully functional VEX Robotic Catapult! Explore the technology behind some of the most influential inventions of our culture's Age of Innovation! Inspired by ancient Greek and Roman designs, 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 3 m (10 feet)! Teaches important STEM principles through hands on learning. Features two alternate builds for more robotic fun! Two balls included. Batteries not required. 8+ years. 

HEXBUG® believes in using the fun of robotic toys to teach kids important STEM principles through hands on learning. The VEX® Robotics Catapult™ feature two alternate builds for more robotic fun! All Catapult's™ construction pieces are compatible with educational VEX® IQ pieces to create your own custom VEX® robot and explore unlimited possibilities. 

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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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