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Post questions and info about hybrid (compressed gas with fuel) powered cannons here. This includes discussion about fuels, ratios, ignition systems, build types, safety, and anything else relevant.
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Unread postAuthor: frankrede » Wed Feb 13, 2008 9:35 pm

I would love to see a giant ice projectile put through a brick wall.
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Unread postAuthor: bigbob12345 » Wed Feb 13, 2008 9:41 pm

That would be awsome
But Im preety sure swat could do that with one of its larger bore barrels already but I may be wrong
Id Like to see it bring a 100ft tree to the ground that would be absolutely amazing.
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Unread postAuthor: D_Hall » Wed Feb 13, 2008 10:36 pm

bigbob12345 wrote:Id Like to see it bring a 100ft tree to the ground that would be absolutely amazing.

Not gonna happen..... Too much respect for trees here in the desert.

A more realistic target would be a concrete wall.
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Unread postAuthor: Carlman » Wed Feb 13, 2008 10:42 pm

concrete still goooood :D
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Unread postAuthor: rp181 » Wed Feb 13, 2008 11:11 pm

How are you going to handle the kickback? just lossen the wheels on the trailer and wath it fly off? O.o

Whats ignition goint to be?
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Unread postAuthor: D_Hall » Wed Feb 13, 2008 11:26 pm

rp181 wrote:How are you going to handle the kickback? just lossen the wheels on the trailer and wath it fly off?

The gun is hard mounted to the trailer.

The recoil mechanism will be nothing more exotic than defeating the air brakes and allowing the trailer to roll a few feet.

Whats ignition goint to be?

Essentially an automotive ignition system running at 28 VDC. Multiple point ignition, of course. Right now I'm thinking of 7-9 ignition points but we'll see how the combustion property tests go.
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Unread postAuthor: rp181 » Wed Feb 13, 2008 11:30 pm

Instead of tapping a lot of holes, are you just goind to run a spark strip on the inside of each wing?

This will be amazing =)
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Unread postAuthor: origin unknown » Wed Feb 13, 2008 11:31 pm

I hope you mic the sound of it going off real well and have it in stereo for your video. Now let me get this straight...Are you both building this for a client and keeping the gun for yourself letting the client have free access of it? I read all of the posts, but didn't quite get this part of it for sure. Good luck! Hope you get it finished!
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Unread postAuthor: OuchProgramme » Wed Feb 13, 2008 11:47 pm

frankrede wrote:I would love to see a giant ice projectile put through a brick wall.


Yep.

Cant do it w/ a real gun though.

Mythbusters proved it so.


But w/ a pneumatic....we'll be breaking the laws. Aha
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Unread postAuthor: D_Hall » Wed Feb 13, 2008 11:54 pm

rp181 wrote:Instead of tapping a lot of holes, are you just goind to run a spark strip on the inside of each wing?

I'll be tapping a lot of holes. Well, actually, my welder/machinists will be tapping a lot of holes. I'll just be drawing pretty pictures of where the holes should be tapped. :?
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Unread postAuthor: frankrede » Wed Feb 13, 2008 11:56 pm

What type of range would you expect out of something this size?
Over 3 miles...atleast right?
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Unread postAuthor: D_Hall » Wed Feb 13, 2008 11:58 pm

origin unknown wrote:I hope you mic the sound of it going off real well and have it in stereo for your video. Now let me get this straight...Are you both building this for a client and keeping the gun for yourself letting the client have free access of it? I read all of the posts, but didn't quite get this part of it for sure. Good luck! Hope you get it finished!

The way it works is this....

A client says, "Hey, I want to smack this here item up against a wall at Mach 0.9."

We say, "No problem. That'll be $100,000 please."

The client gives us the money. We build the gun. We shoot his item into the wall. He walks away happy. We keep the gun. After all, we didn't contract to build a gun for $100k. We contracted to smack his item into a wall for $100k. How we do it is of no consequence to the customer (odds are he wouldn't want the gun even if we let him have it).

Of course, the NEXT guy who wants something smacked into a wall only gets charged $20k, but, hey, that's the penalty for being on the bleeding edge.


Overly simplified, but that's the basics of how our business works.
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Unread postAuthor: D_Hall » Thu Feb 14, 2008 12:10 am

frankrede wrote:What type of range would you expect out of something this size?
Over 3 miles...atleast right?

Not only no but hell no.

Likely target ranges are under 100 meters. The point wouldn't be to prove how far something could fly. The point would be to show what happens when something hits a wall.
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Unread postAuthor: frankrede » Thu Feb 14, 2008 12:28 am

D_Hall wrote:
frankrede wrote:What type of range would you expect out of something this size?
Over 3 miles...atleast right?

Not only no but hell no.

Likely target ranges are under 100 meters. The point wouldn't be to prove how far something could fly. The point would be to show what happens when something hits a wall.
Thats good, any idea as to a backstop?
A hillside?
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Unread postAuthor: D_Hall » Thu Feb 14, 2008 12:44 am

frankrede wrote:Thats good, any idea as to a backstop?
A hillside?

Uh... We have about 1.1 million acres at our disposal. I'm sure we'll think of something.
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