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super cannon

Built a pneumatic 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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Unread postAuthor: MrCrowley » Mon Apr 26, 2010 7:43 pm

Nobody wants mashed potatoes on their windows.

I was thinking more along the lines of smashed windows :P

Not that you care if they get banned in the US, Mr. NZ

Spudfiles could be taken down though :wink:
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Unread postAuthor: Gun Freak » Mon Apr 26, 2010 7:45 pm

Oh yeah, or mashed potatoes with glass shards in them :D
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Unread postAuthor: kydavies » Mon Apr 26, 2010 7:55 pm

first that was our first shot and we aimed it into the bush ( large greenspace behind my house which is followed by and excessivly large hill) so we had no idea how far this thing was going to go but we figured we would be safe, apperently not. also i live in a small town called Squamish B.C in Canada so everything is spaced out and im 90% sure i didntbreak a window
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Unread postAuthor: Gun Freak » Mon Apr 26, 2010 7:57 pm

90% isn't good enough.

JK

Just be a little more careful, never under estimate a spud gun's power. :P
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Unread postAuthor: kydavies » Mon Apr 26, 2010 8:04 pm

i know wer not going to shoot it a my house anymore but there is a beach i could take it t but i would need a car and someone to hold the camera also i need it to stop raining so maby i could get a video tis weekend
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Unread postAuthor: SpudBlaster15 » Mon Apr 26, 2010 9:51 pm

MrCrowley wrote:I was thinking more along the lines of smashed windows :P


If he's just firing the cannon into the sky and the potatoes are coming down at only slightly higher than terminal velocity, I doubt they have sufficient kinetic energy to smash a house window. You'd more than likely end up with a splat, unless of course the cannon operator decides to fire harder projectiles.

Still not an activity I would recommend however.
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Unread postAuthor: MrCrowley » Mon Apr 26, 2010 10:36 pm

If he's just firing the cannon into the sky and the potatoes are coming down at only slightly higher than terminal velocity, I doubt they have sufficient kinetic energy to smash a house window.

Not to get in to an argument about windows but over here on some older houses (dating back to around the 1920's I think), there are really thin windows. I remember being a kid and playing BYC in my friends yard when a tennis ball pretty much floated through a window (left a hole in the window, the whole window didn't smash) and it was travelling pretty slow. My brother put his arm through a window at our house when trying to open it and he didn't push very hard.

But yeah, anyway :P
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Unread postAuthor: Technician1002 » Mon Apr 26, 2010 11:41 pm

In range testing the QDV 3 gallon launcher with an 8 foot long 2 inch barrel, we got about 200-250 yards with spuds. Use Google maps to see what is within range. Satellite view is great for this. I know my range with spuds, apples, tennis balls, marshmallows, etc. The only regular unknown projectile is golf balls. They are most often lost and never found.

For range testing tennis balls, we found a large reservoir.
Using the now known distances of the tennis balls, Google maps can be used to check for houses in the woods downrange to see if any are within range.
These photos show the tested range of tennis balls with the 3 gallon tank and 2 inch valve. The long distance landing was filled with water. Green dot on shore is the launch zone. Green dots in the lake are landings measured with a GPS. Purple is a line toss between two hills on each side of the parking lot entrance. A water bottle towed a mason line. Shot distance was limited by the length of the line. Regular tennis balls go about 550-600 feet. Water filled tennis balls go almost 1,000 feet.

The photo on the sports field were tennis balls with the small Marshmallow Cannon tank. The range is less with the small tank and 1 inch valve.
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Testing of the Marshmallow Cannon with the tennis ball barrel.
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Unread postAuthor: psycix » Wed Apr 28, 2010 12:23 pm

kjjohn wrote:Looks very large and powerful, however, it appears in uses a ball valve. BV's have high flow, but very slow opening times. You would be much better off upgrading to a modified sprinkler valve.

Usually, opening time is important, especially on short barreled guns, however, in this case (long barrel, big chamber) it matters less.
A sprinkler could even degrade performance due to its flow restriction, even when fully opened.

Springloading the ball valve would be the best option, granting an acceptable opening time with a completely unrestricted flow when open.
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