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school project

Built a hybrid cannon? Then post it here! This section is for completed, finished cannons that you have built. Please include pictures and information.
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school project

Unread postAuthor: taylorw152 » Thu Feb 23, 2012 8:42 pm

Well my cousin recommended this site and said it could probably help me out. My class is entered in an "iron egg contest", if you don't know what it is, its a bunch of schools make a contraption to shot an egg the furthest, sounds stupid I know, but I'm wanting to make this an awesome experience. What I was looking at doing is making a rolling cart, have an electric air compressor on the back, then have a PVC cannon. An air chamber at the rear of the cannon, 6 inch schedule 80 at least a foot and a half long that holds 100 PSI, then a ball valve with a large cheater bar for quicker release into a 3 inch PVC pipe running about 5 feet long. I want to have the cannon barrel on a (for lac of a better word) axle at very rear so i can lift the muzzle of the barrel at different angles. Also I was thinking of making a canister for the egg with two springs on each end of the inside holding the egg so it can flex due to pressure and also put a type of foam on the inside. If you have any better ideas or designs please fill free to post them. :D
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Unread postAuthor: battlelava » Thu Feb 23, 2012 9:11 pm

The Sabot is going to be extremely important to keep it in one piece
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Unread postAuthor: Gun Freak » Thu Feb 23, 2012 9:41 pm

I think a captive piston with a padded or spring loaded face will be a good option.
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Unread postAuthor: taylorw152 » Thu Feb 23, 2012 9:51 pm

what is a sabot? and also how do i make a padded piston
BTW i forgot it has to be under $150
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Unread postAuthor: evanmcorleytv » Thu Feb 23, 2012 9:54 pm

taylorw152 wrote:what is a sabot? and also how do i make a padded piston
BTW i forgot it has to be under $150


This is a sabot:http://en.wikipedia.org/wiki/Armour-piercing_discarding_sabot

And this project can easily be done for $150. If I were you, I would simply go with a modified sprinkler valve, for price, and simplicity.
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Unread postAuthor: taylorw152 » Thu Feb 23, 2012 10:04 pm

ohhh okay and yeah i think ill have bots wielded to back inside half of container then have them come threw top have for lock washer and bolts, so i can open and close when needed but it will stay in place. Also are modified sprinkler valves hard to make?
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Unread postAuthor: battlelava » Thu Feb 23, 2012 10:21 pm

Modded sprinkler valves

http://www.spudfiles.com/forums/modding ... -t305.html

and also

http://www.spudfiles.com/forums/how-to- ... 19270.html

Look around a little. A lot of your questions will be answered with most of the stickies and a few searches.
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Unread postAuthor: taylorw152 » Thu Feb 23, 2012 10:24 pm

thanks yeah I'm new to the site and have no idea what im doing lol. but im going to talk to my teacher tmrw and see what he thinks and ill probably be reposting. I appreciate the help !
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Unread postAuthor: Technician1002 » Thu Feb 23, 2012 11:09 pm

A quick note on high pressure and eggs, they break. Forces on an egg in launch will limit the pressure you can use. Build early and plan on tossing a few dozen eggs before the event to find the sweet spot where most launches don't break. I did an egg toss and had to run under 25 PSI. With a large chamber and high flow valve, we got an egg on the roof of a building on the adjacent field about 80 yards away. Eggs fly pretty well.

Possible sabot idea for a gentle egg launch is below.
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Unread postAuthor: Crna Legija » Fri Feb 24, 2012 12:20 am

yeah just like tech said 100 psi will most probably brake eggs every time, i would be a big massive low pressure chamber with a really long barrel.
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