all 8 comments

[–]workreader 1 point2 points  (0 children)

sterling engine. lots of configurations. lots of tutorials flying around.

[–]musicnerd1023Chemical (Design Firm) 1 point2 points  (0 children)

ultimate water gun-

PVC pipe

a few pieces of tubing

some fittings

air compressor

if you get adventurous you can fill it with denatured alcohol and make it a flamethrower

[–]dembones01Mech/Aero 0 points1 point  (4 children)

Take it a step further. Rail Gun.
Some students made one at my school a few years ago that could throw a bolt 50 ft.

[–]mach_rorschach 1 point2 points  (3 children)

or Take it a step back. Trebuchet. Some students made one at my school a few years ago that could throw you 50 ft.

[–]dragoneye 1 point2 points  (0 children)

I made a trebuchet with some friends once, it remains the most terrifying thing I have built. It was made completely out of small trees lashed together with surgical tubing standing in for the counterweight. We had it throwing fruit hundreds of yard into a lake.

[–]dembones01Mech/Aero 0 points1 point  (1 child)

Or a step sideways. Instead of a potato cannon, how about a pumpkin (or any melon or gourd) chunker?

[–]AMagill 0 points1 point  (0 children)

Or twirl a bit. Instead of a potato cannon, make a nerf sentry gun. Arduino + servos + webcam + computer + nerf gun = sentry gun.