Q: How big can the device be? What is the limit on its dimensions?(section: The Competion explanation / paragraph: Number #4 / sub-paragraph: / line: Line #1)
A: The size limits on the Tennis Ball Catapult are the maximum height described in #3, and reasonability.
3. "... The last point on the device touched by the tennis ball may not be more than 50 cm above the ground before, during, or after starting."
The catapult must be of a reasonable size. Remember that 2 students must be able to carry the catapult and set it up.