Looks pretty cool.......... They need more thrust though. I'd love to see one that would launch the squirrel across town. Unfortunately it would be difficult to launch a mouse from inside the house...... I've considered "mouse flushing" though............
The squirrel launcher reminds me of the propane actuated wood splitter I once built.......... Used a small compressor with a propane carb attached. You fill the cylinder with propane air mixture up to 100 psi, and touch it off. Used a sparkplug and a coil. A rubber bumper kept it from self destructing at the end of the stroke, and it was returned with a couple of very strong springs. Worked fine most of the time, but it was a bit scary.... It would throw the wood. The problem was that if it didn't get a full split, it wouldn't return until you cleared the wood, and with spring tension that could be a bet tense. Definitely not a toy for everybody! Not something I would recommend trying to duplicate. I did use it for quite awhile until I mounted a cone splitter on the end of my knuckle boom with hydraulic drive. With almost 30' feet of reach and 2500 lbs lift at full extent, it works great. You reach out and screw into the block a little way, then lift it and swing it over the wood pile, then hit the control and it screws into the block and splits it. All this will sitting in a lawn chair next to my truck running the controls. I use an 18 HP kohler to run the hydraulics....... I really don't want to have a 3126 idling just to run the splitter!
H.W.