hey i'm looking into building a pneumatic gun next, i just finished my propane injected cannon and now i want to experiment with air. I have seen a few different sprinkler valves at menards and I am just wondering what makes these so bad? Also what is a piston valve? Is it something you can buy or i...

I don't know if this will work but here it goes.... http://www.facebook.com/photo.php?pid=873798&id=630727782 http://www.facebook.com/photo.php?pid=873794&id=630727782 http://www.facebook.com/photo.php?pid=873793&id=630727782 http://www.facebook.com/photo.php?pid=873796&id=630727782 http://www.faceb...

Alright I finished my propane cannon now and wanted to put pictures on this website, but all my pics and videos cannont be uploaded because of their size. Please take the time to go to http://www.youtube.com and search "Marske's Spud Cannon." for a short video and http://www.facebook.com and search ...

Alright,...I used burnt latke's fuel tool 1.5 to figure out my metering pipe length and diameter...My chamber is 2 ft long which is a little over 300 cu. in. It calls out for a 12-13 inch metering 1/2 pipe around 60-70psi... so i went and bought one tonight and put all the fittings together and the ...

Starman thank you very much for the pic. Tonight I spent two hours searching the plumbing isles at Farm and Fleet and Menards..., i found that 4'' male thread adapter and configured something llike you have in your pic and was about to buy it, except that i have had problems with the large threads s...

If at all possible, could you post a picture of your valve setup. Obviously you have a fitting that screws into the back like a cap would, but I have been looking at a few different hardware stores, (menards, Farm and Fleet, Ace hardware...) and i still can't find a 4'' end piece with threads that w...

That is awesome! I'm happy to hear this! If eight 9V batteries didn't smoke the motor, 2 definately won't put a scratch on it. Thank you for all of your feedback!

How do you clean your chamber if that valve is permanent? Don't you want a cap that screws off in case you need to replace your chamber fan? Also that is about the size of Chamber that I am building. Is that a 1/2 diameter metering pipe?? Please tell me I'm right??

I looked into what 60psi would do for the next size pipe which is 1/2. it calls for 10 inches. Now from all of you experienced propane injection cannon builders...is 60psi usually the pressure that you run into through out the life of the propane cylinder. I read on burnt latke that you should alway...

I know the conventional easy way to exhaust your chamber using a fan is just unscrewing the cap from the chamber. I know that you can mod the cap and fit it with a valve to eliminate having to always unscrew the end cap. I have seen pictures online but have no idea how you mount that valve on the ca...

Burntlatke is the site I used to determine the pipe length. For the volume of my chamber at 90psi, it determined that i will need over a 12 inch 3/8 pipe or a 6 inch 1/2 inch pipe. 12 inches seems a little long right?? I am just worried about misfires and lack of performance. I would hate to build t...

I just measured the volume of my combustion chamber and did the math to find the length of my metering pipe. unfortunately my chamber calls for a 12inch piece of 3/8 pipe. The problem is I already bought all 3/8 brass fittings and have lots of time and money invested and it is almost too long. I kno...

Thank you guys for your info. I agree that the combustion will damage the fan before the higher voltage will. I never thought of that. I will use two 9 volt batteries. When I am finished with this cannon i wll post pics of the cannon and its destruction.

I have been looking at making a fan controler for my propane injected spud cannon that i'm building and I was wondering if any of you guys have ever used two 9 volt batteries in a series (18 volts) to power a 12 volt fan? Also wondering if over time will 18 volts really damage the fan that much? How...

I Planned on making a "Straight" design at first, then as i was surfing the internet, I kept seeing all of the "Over Under" designs and i really like those. What is the difference between the two??? I will probably end up making my first propane cannon a "Straight" cannon. Hopefully graduate up to m...