I leave my xbox top off most the time since i soldered a dual tsop mod so i can switch between 2 bioses, i also cut out part of the casing of the dvd drive and the top of the case so you can see the drive spinning
i also have blue leds in my control ports and a 200gb hdd,

No offense , but I often doubt the people that say they shoot half a mile or 500yds with a combustion thats neither a huge pneumatic or a hybrid. Unless you have Actually measured it, not by walking then sure I would believe you but estimates are often WAY off. [/rant]

ya ive gone over this alot as well, you need hundreds or thousands of psi to get shock heating that substantially will effect the airs speed of sound. Otherwise you could heat the air or use Helium as your gas.
sucks dont it

eh i can guarentee you another lawnmower engine of 2-3hp will work better then a 1hp little electric motor, i have a friend thats made one.
The very best motors are 2hp induction motors, they last long and are very efficient.

hmm a 1hp motor most likely wont be powerful enough to get 100psi. You need atleast like 2.5hp, I would suggest another lawn mower engines with the shafts connected to eachother. I hope to build one of these soon to replace my current sears craftsman 100psi portable compressor.

hmm thats it?

I was hoping for much better results, I really don't want to have to play for 3 supah valves jeeze thats like 300+ bucks =\

And ggdt doesnt work on my computer, it gives me an error7 out of memory error =(

wee i just calculated my specs from http://www.bavetta.com/aircannon.html

im supposed to have a 350ft barel, and exit velocity of 564m/s
and max height of 53375ft

Of course theres no way id ever reach those estimates hehe but its still fun to imagine =p

Hi, thanks for replying with some feedback. Yah that design works good to, ill have to try both once i get the parts and see which is easier to make, im trying to be as cheap as possible but still having a great cannon. And no i wont be using a bicycle pump, im using a compressor that does 100psi at...

I soon will start on my latest cannon, my third. I've been thinking about it for a few days and have figured it out. It will consist of a 15 foot piece of 8inch Schedule 40 PVC cut in to three 5 foot lengths. They will be placed side by side in a roller cart. Each will be capped on one end with a sc...