My new gun has a cylinder (pvc of course) 2 feet long and 4 inches in diameter for the combustion chamber. I have a 2 inch diameter barrell that is six feet long. Total length probably 8.5 feet.
Remember wiffle balls with holes made of light weight plastic? If you put a spin on them when you threw them they would curve easily.
Now: I've shot some potatoes which spun so fast that they actually curved like a wiffle ball when shot straight up into the air. The height was unbelievable. It was scary regarding how much height was reached. I used Suave hairspray which is fantastic and a lantern lighter igniter.
Have a great day people. Just a story for you.
Amazed at performance of my new potato gun. Read this.
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Johnny Blast
- Private
- Posts: 17
- Joined: Mon Jul 03, 2006 4:50 pm
I don't have any pictures yet. I don't think I'll be using the gun too much because of the saftey issue: "Where is it going to land"?
this sounds like your first or second spudgun, trust me, the explosiveness of combustions makes them seem pretty powerful, but yours prolly isn't that good compared to people who have been doing this for awhile. i was impressed with my first combustion cannon too because i had never been exposed to any other types of spud guns.Johnny Blast wrote:I don't have any pictures yet. I don't think I'll be using the gun too much because of the saftey issue: "Where is it going to land"?
that was a little more than 4 months ago and ive built far better cannons since then. (pnuematics)
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boilingleadbath
- Staff Sergeant 2
- Posts: 1635
- Joined: Sat Mar 12, 2005 10:35 pm
- Location: Pennsylvania, USA
To be kind, I went and plugged some data into EVBEC:
You have a ~300 cubic inch chamber, and a ~230 cubic inch barrel, for a 1.33:1 C:B ratio.
If you where using metered propane and a chamber fan, you would be getting ~450 fps with a potato. As is, without a chamber fan, you are getting maybe 350 fps on average, and that number is dropped farther (on average) by using a hand-metered fuel.
You have a ~300 cubic inch chamber, and a ~230 cubic inch barrel, for a 1.33:1 C:B ratio.
If you where using metered propane and a chamber fan, you would be getting ~450 fps with a potato. As is, without a chamber fan, you are getting maybe 350 fps on average, and that number is dropped farther (on average) by using a hand-metered fuel.
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Johnny Blast
- Private
- Posts: 17
- Joined: Mon Jul 03, 2006 4:50 pm
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To be kind, I went and plugged some data into EVBEC:
You have a ~300 cubic inch chamber, and a ~230 cubic inch barrel, for a 1.33:1 C:B ratio.
If you where using metered propane and a chamber fan, you would be getting ~450 fps with a potato. As is, without a chamber fan, you are getting maybe 350 fps on average, and that number is dropped farther (on average) by using a hand-metered fuel.
You are very kind. And yes this is only my second gun I have made, to answer a previous post. You guys are good and I had no idea that it's possible to delve into this subject so scientifically and in such detail.
To be kind, I went and plugged some data into EVBEC:
You have a ~300 cubic inch chamber, and a ~230 cubic inch barrel, for a 1.33:1 C:B ratio.
If you where using metered propane and a chamber fan, you would be getting ~450 fps with a potato. As is, without a chamber fan, you are getting maybe 350 fps on average, and that number is dropped farther (on average) by using a hand-metered fuel.
You are very kind. And yes this is only my second gun I have made, to answer a previous post. You guys are good and I had no idea that it's possible to delve into this subject so scientifically and in such detail.
