One of the quietest challenges in a long time. Is it summer holidays, perhaps?
4 entrants in the end (including me).
1774 - bythelee - a dark flipper with more in the flipper and less in the catcher
1770 - Mark_man - another dark flipper, with less inthe flipper and more in the catcher
1618 - Arunion - with a decent take on a rubber punt
1528 - dec10 with a rocket
I also made a few other solutions, none of which were competitive.
A double rubber punt, a chain dragger (which might have worked better with a pulley), and a trebuchet, that didn't get much development.
Mark_man says he can't host the next one, so it would fall to Arunion to tweak the next "old" challenge (no 13) as he likes. Over to you....