Ok, I have a very small budget and I am extremely cheap. I wanted to see if I could make a pneumatic out of things I have laying around the house. Here is my idear, I have a 1L Dr. Pepper bottle, this is going to be the chamber, the schraeder valve would go in the bottom of the bottle where the plas...

I was thinking of making a bow exactly (well almost exactly, I didnt think of pullies) when I made my pencil thing. I was going to build a decent one but the pencil thing was just a project to put together in a couple minutes.

Lol, man, the second post was great.

My sister had here permit for almost 2 years before she finally went in to get her license, even then my parents had to force her to get it

http://www.spudfiles.com/forums/viewtopic.php?t=313
thats the link for the 3" piston how to

You could use that for a pneumatic if you get enough steam.

Aww man, 4 stroke? I hate 4 strokes. It sounds pretty fun though, good luck with it.

Sorry, I didn't notice that this was under off topic, I saw "sabots" and assumed for some reason it was meant to be launched from a cannon.

You can mod a valve for under $10 dollars US I believe.

KlugeBoy
You are supposed to use the edit button instead of double posting.

Ok, I hope you get it working. If I may suggest an ammo, take a small piece of paper (around 2" by 6"), roll it into a cone until it fits into the barrel, then stick a needle(pretty much anything pointy and thin, I have also used t-pins, toothpicks, and sharpened coathanger pieces) through it. They ...

Try a different fuel as well, I cant think of what else it could be, unless it is that the spark isnt hot enough.

That is what I would do, I'm not sure if it is the best way to go about it though.

Well, if it sparks, then it should be fine, try reducing the spark gap just for giggles to see if it helps. If not, try a different fuel. If it still doesnt work, dont use electrodes, just stick the wires straight into the marker (that helped with mine).

I think its a great idea. One problem is, you arent allowed to (at least I dont think you are allowed to) launch any self propelled ammo out of a spud gun. But on the topic of this, the project box isn't attached to the rocket is it? Because if it is it would throw off the accuracy.