During a recent RCSE discussion of bungee launching, I was reminded of
this "thing" that kids have been playing with this summer. I looks sort of
like a dragon testicle, if there were such a things as dragons and they had
testicles. It is a spiky soft rubber ball with a motion sensitive light
inside it, and it has a 7" elastic strap molded as part of it, ending in a
finger ring.
Kids sort of zap the flashing ball back and forth like a yoyo.
The amazing thing is the strap, about 1/4" in diameter and only 7" long,
it stretches out to a good 60", or over 8 times it's original length. ( I
seem to recall surgical rubber tubing stretching 3 or 4 times its length.)
The one at our house has held up all summer with no splitting, cracking,
etc.
What is this thing made out of, and should we be looking at it for
highstarts?
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