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Tape some cannon fuse to the outside of the balloon. As it burns down to the balloon it should burst it.
Some testing of the burn time of the fuse and time of balloon flight is needed.
Or use a string tied to a trigering device on the balloon to burst it. useing a known string lenth with the other end tied to your side.
A trigering device could be made with a tube, two springs, fireing pin, and something with a sharp point.
The tube needs two ends with holes smaller than the springs and larger than the sharp point. The two springs are one long for fireing or pushing the point out the end to burst the balloon and the other shorter spring to push the point back in so it dosnt hurt someone. The other hole is so a vacume isn't made to slow the point.
A hole or slot in the side of the tube for the firing pin to hold back the point and comprest long spring is need. The string tied to the firing pin pulls it out to fire the point into the balloon to burst it.
The firing pin may cause too much friction to be pulled out by the string so some other way may be need.
This can be reused.
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