Posted: 8/7/2014 4:55:36 AM EDT
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For educational purposes only, consider the following scenario:
A person has a 55 gallon plastic drum. Like one of those thick blue ones. Assume they want to launch that drum at least 40-50 feet in the air, hopefully without destroying the drum in the process. Not because the drum needs to be able to hold water, but because it will be a carrier system for a small video camera. The camera will need to remain functional to recover the video so the drum, along with some creative padding of the camera, needs to be able to absorb the blast force (and landing). I'm thinking make a circle of cinder blocks or similar, flat sides out, with a bullet window left open. Put the Tannerite in the center of the circle and place the barrel, opening down, onto the cinder blocks. How much Tannerite do you think it'd take? Any better theories for shaping the blast? Go. |
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Might be a good idea to cut a round piece of 3/8" plywood and screw it to the bottom to help prevent deformation and loosing the camera mount. No idea about how much though. I like the plywood idea. Maybe even cutting some circles to screw into the barrel interior for more support. Like ribs. |
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Might need a tighter funneling system or you'll lack the power to lift such a heavy object.
It'll blow the cinder blocks away - path of least resistance and all. So if you had (2) two barrels you could stake the bottom one into the ground, cut a shot hole, cut the top off, place X-lbs of AN in there and then place your launching barrel on top of that one. That would force the vapor up for the lift. The side walls will likely hold if the top is cut out. I seriously doubt you will get much lift of such a large heavy object though. TisTennessee is the explosive expert around here - he should know the mechanics of this. pm him. |
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My suggestion: Mount the camera on a platform on the top of the barrel. Platform has a lip so it sets on the top but once the barrel falls away, the camera comes down with a small parachute.
You would get a camera view of the launch but just wouldn't ride the barrel back down. 
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My suggestion: Mount the camera on a platform on the top of the barrel. Platform has a lip so it sets on the top but once the barrel falls away, the camera comes down with a small parachute. You would get a camera view of the launch but just wouldn't ride the barrel back down. 
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No theoretical involved....
YouTube There's a part 1 where it didn't launch, as well as a part 3 where we destroyed the barrel. I've got some calls out to people to see if we can remember how much tannerite was used for each step. If I remember right, we knocked down the barrel more times than launched it. So a camera would have to be padded to take the abuse. You can also check what 50~ish pounds does to the Buick.... If you are bored. |
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Why so big? Weight and area are the enemy here. The larger the projectile the faster it will slow are this more impulse will be needed to loft it to the desired altitude. Same with weight. I saw some launch on youtube and it was impressive. I was also thinking that the more material that went up the more shock absorbency for the camera there would be. Now that we're talking about parachute re-entry maybe a smaller launch vehicle makes sense. |
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No theoretical involved.... YouTube There's a part 1 where it didn't launch, as well as a part 3 where we destroyed the barrel. I've got some calls out to people to see if we can remember how much tannerite was used for each step. If I remember right, we knocked down the barrel more times than launched it. So a camera would have to be padded to take the abuse. You can also check what 50~ish pounds does to the Buick.... If you are bored. Part 2 looks perfect. Were you just shooting through the barrel? How much of the blast did you feel when the Buick went up? |
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...or just theoretically mount a shallow wire basket to the top of the barrel and have the camera with parachute theoretically placed in the basket.
Be sure to post theoretical vid.  I have access to some impressive 3D rendering technology.
Parachute? http://www.amazon.com/Rip-stop-Nylon-Parachute-Water-Rocket/dp/B004091ZIS/ref=pd_sbs_t_1?ie=UTF8&refRID=1SAPA72TBX4TDRNH6F64 |
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We were shooting through the barrel, that's why it didn't go on the first couple hits.
I think we had the tannerite sitting on the ground, and I want to say it was only one or two of the jars. The Buick was pretty frigging awesome, 55gr ammo lost too much energy going through the door/A-pillar. We went down after wondering why it wouldn't go and actually sifted bullets out of the big bag o tannerite. Switched to m855 and it went up in a couple shots. If you have the means, I'd highly suggest blowing up something big via tannerite. |
| I don't know what will launch a barrel, but I do know that 2lbs is enough to shred an iron engine block, fold the fenders out, and launch the hood of a 1993 nissan hardbody pickup 100' in the air. It is also enough to send a 20 gallon bladder tank for a well about 200' up. |