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One of my team members asked if they could use a rubber balloon to propel the car -- a balloon is a non-metallic elastic material, and the energy to propel the car would be stored in it. Thoughts?

Here is a photo showing breakage after one flight, but it's broken in multiple places and had to be re-glued: https://drive.google.com/file/d/1zvKFXPBPD-QYOB-1vKtsyG-o_m3Wxk8R/view?usp=sharing Another question related to this post... do you think this plane is fixable or would it be better to start ...

Every time my team members fly their plane, the balsa wood breaks somewhere and has to be glued back together. Are there materials other than balsa that work well for this event and don't break every time?

Can anyone direct me to a flow chart or give me a series of steps for identifying what's in a mixture?

Also, what methods of mixture separation are likely to show up at state?

How many beakers, erlenmeyer flasks, graduated cylinders, and test tubes should a team bring for Crimebusters?

How many beakers, erlenmeyer flasks, graduated cylinders, and test tubes should a team bring for Potions & Poisons?