Spring-loaded RC bomb

Here is a spring-loaded bomb intended for dropping from RC airplanes, but could be used for any purpose.

Normal (passive) RC bombs are unimpressive. Most are a piece of foam or plastic that hits the ground with a dull bounce. I have also used various break-apart plastic bombs, which can be filled with something like chalk or rice flour, and scatter a bit of dust on impact. This is an improvement, but still the dust generally splatters horizontally due to downward momentum (dust doesn’t really bounce). It leaves a nice mark on the runway, but still, it is not very bomb-like. So I thought it would be good to embed a spring inside a bomb, to throw a bit of debris upward. Here is a design for that.

See youtube video with instructions and demo at:
https://www.youtube.com/watch?v=-SKtauXVptM

A second video for updated files is at:
https://youtu.be/n8TuWNpvReU

CAUTION : DO NOT POINT A COMPRESSED SPRING AT YOUR EYE WITHOUT EYE PROTECTION. It isn’t very much energy, bu