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Unread postAuthor: jimmy101 » Sat Nov 05, 2011 2:32 pm

pneumaticcannons wrote:
D_Hall wrote:
jimmy101 wrote:Dave

Quick question ... from "click to bang" (ignition to round leaving the muzzle) how long does the "gun'o-god" take?

I don't really know, but I'd guess on the order of 1 second.

wow, thats quite a delay! I can only imagine how much pressure is building up!
Big chambers take a long time to combust, even with multiple fans and sparkers to speed things up. In a typically sized combustion spud gun click-2-bang is about 50mSec with about a 30mSec delay between click and start of movement of the spud.
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Unread postAuthor: D_Hall » Sat Nov 05, 2011 10:58 pm

Nah, the combustion in this case is very fast... But the barrel is very long and the accelerations are pretty damned low (I suspect they're survivable by a human). Combine long barrel with low acceleration and yeah, it takes a while to clear the muzzle.
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Unread postAuthor: jackssmirkingrevenge » Sun Nov 06, 2011 12:21 am

D_Hall wrote:Do consider that the Trident launch tubes really are nothing more than hybrid guns


Oh? Details? I was under the impression it was a steam driven affair.
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Unread postAuthor: D_Hall » Sun Nov 06, 2011 12:23 pm

Yeah, it's steam driven... But it uses burst disks to control the steam. It's very much a hybrid spud gun on steroids. But where most use combustion to heat nitrogen (inert air components), this one uses combustion to heat water (it's easier to store X pounds of water in a small space than it is to store X pounds of nitrogen in that same small space).
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Unread postAuthor: jackssmirkingrevenge » Mon Nov 07, 2011 12:47 am

Right, some quick research later:

The missiles are ejected from their tubes by igniting an explosive charge in a separate container which is separated by seventeen titanium alloy pinnacles activated by a double alloy steam system. The energy from the blast is directed to a water tank, which is flash-vaporized to steam. The subsequent pressure spike is strong enough to eject the missile out of the tube and give it enough momentum to reach and clear the surface of the water.


Complex but I understand the compactness advantages vis a vis a pneumatic launch.
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Unread postAuthor: D_Hall » Mon Dec 12, 2011 12:41 am

This year has been one hell of a year.

Friday I learned that starting tomorrow my domain will be a bit larger than it has in the past. They're adding this place to the list of facilities that I run. It actually makes a bit of sense as it was an "island" inside of my larger facility, but now the island will be mine too.

The good news: I'll have access to 600 HP worth of 3,000 psi air compressors.

The bad news: I can't exactly put them in the back of my truck and borrow them for the weekend.
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