Sum Ting Wong wrote:

...
Built one of these for quite a bit more than ten dollars but it works
pretty well: http://www.antennalaunchers.com/csv19/index.html

I recall that the sprinkler valve was $11-12 at Home Depot just by
itself.

S.T.W.

STW:

Before this thread, I was stuck with watching "Myth Busters" for fun!

All I got is a slingshot ... but I am thinking.

Regards,
JS