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What length should the rubber motor be? The motor stick is 12 inches, a little more than 30 cm

Thanks so much for your replies! Thinking super glue could work now, much easier to acquire. Again, thanks!

I joined my school's science olympiad this year, so I am relatively new to helicopters. I've gotten all my supplies, but the glue. I asked around, and some said model cement or super glue. However, I researched and found out that super glue is too heavy. Also, I am unsure about which model cement to...