SpudFiles

Welcome! Those are some amazing plans. A lot of work involved, that's for sure. Your changes seems fine to me. Keep us posted on your progress and good luck!

Whoa, this thing is complicated. Would be so awesome if it worked!

A hybrid piston's opening pressure is determined by how much air pressure you pump behind it. I'm more interested in how you are matching the shape of that egg so perfectly that it won't break upon firing. The sabot has to match the contour of the egg perfectly, right? Otherwise it breaks upon firin...

I'm enjoying this thread. I like the input from a variety of people. Reminds me of the good old days when the forums were more active and people got excited about new ideas. I hope this things works. Might I suggest safety glasses, some thin leather gloves and perhaps a safety T-shirt...

That's a really clever design. I like it! Nice work as well. Very interesting.

That all makes sense. I can see the convenience of doing this to enable more power. It would be a real innovation in this hobby if you made something like this. I don't think I've ever heard of one before and certainly haven't seen one.

I just watched it. It's awesome. It slings a battery pretty damn fast. Nice work.

One of my first launchers was a battery launcher. I used sprinkler valves with battery operated solenoids. Performance was garbage, but it was fun. It was a fun thing and you also have a fun thing. I'd like to see yours work.

Predicting it's behavior would be complicated and difficult, but I can see this possibly working. It's funny to see this because I had a similar idea except I thought about using a hand crank to compress the chamber B side. A gear reduction and a worm gear or ACME thread with a piston to compress th...

I think it's BLM land where I go, but I've never actually looked for a truly isolated spot. Your idea sounds good and I might end up doing that, but I won't want to go alone and without a good medical kit to stop the bleeding at a minimum. I have only one concern that is on my mind and is partially ...

Whoa, I've never heard of a stand up bike before. Nice work for sure. Are they hard to ride?

The water from your hose can be used to displace the air in a chamber and pressurize it. The air pressure is limited to your water pressure coming from the hose. You would only do this if you didn't have a bike pump or air compressor.

Using Trig sounds like a fun way to do it. Good ideas! Also, you're right about not being able to simply pace it out. It's not safe to walk that far out since it's an open range.

Not much to work with, but you can see the impact of the first shot just above the propane bottle. 8 OZ soda cans at 3X, approx 30deg angle (you can judge angle yourself from video), approx 5 second flight time. My guess is maybe 200 yards? Maybe 250? [youtube]https://youtu.be/UvQ_2btZp58[/youtube]

Water is an incompressible fluid, so I'm not sure there is any way to use it to fire a potato. I think A water rocket uses the mass of the heavy water as a means of thrust. In a spud gun, you want the spring action of the compressed air to all act on the potato. If the energy is used to also shoot o...