It's a pipe dream....


Postby D_Hall » Wed Sep 27, 2006 12:24 pm

<blockquote id="quote"><font size="1" face="tahoma,verdana,arial" id="quote">quote:<hr height="1" noshade id="quote">Originally posted by SpudStuff
[br]Enter it in the pumpkin chucking contest!
<hr height="1" noshade id="quote"></blockquote id="quote"></font id="quote">

1) The design is for firing horizontally, not with elevation.

2) I doubt it'll be street legal to haul on the trailer. Not a problem as long as I'm running around a military base but a big problem if I want to leave the base.

3) While it would make a nice publicity stunt, I don't imagine the taxpayers would appreciate the money that would cost... I can easily imagine that costing $20k by the time salaries, travel expenses, etc. are paid for.

4) I've got funner projectiles in mind.
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Postby sgort87 » Wed Sep 27, 2006 1:19 pm

Children?
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Postby joannaardway » Wed Sep 27, 2006 4:54 pm

When did "Children" and "funny" go together?

I say that it's a massive watermelon.
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Postby SpudStuff » Wed Sep 27, 2006 6:58 pm

How is ot not street legal? Just gont paint the word gun on it. Do you worl for the military?
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Postby D_Hall » Wed Sep 27, 2006 8:41 pm

OK... It's street legal with escort vehicles and special permits. Basically it's too long for the trailer (barrel extends 20 feet beyond the bumper) and it's REALLY WIDE (about 14 feet wide).

And yes, I work for the military. My business card reads...

Mechanical Engineer
Ordnance Test and Evaluation Branch
Naval Air Warfare Center - Weapons Division
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Postby D_Hall » Wed Sep 27, 2006 8:47 pm

And I finished preliminary design today...


As ready to load...
<img src="http://www.thehalls-in-bfe.com/Bender/19inch_broken.jpg">
...The barrel rolls forward about 10 inches on the whole carriage and then tips upwards to align itself with the loading ramp.

...You then drop the barrel back to level, slide the barrel back, and you're ready to go...

<img src="http://www.thehalls-in-bfe.com/Bender/19inch_gun.jpg">

As for the two tanks mounted sideways on the forward end of the trailer (one 29" diam, the other 8"), those are metering pipes: the 8" for propane, the 29" for air. Basically, once the projectile is loaded and ready to go you fill both of those tanks to (roughly) 100 psi. Leave the area and then open valves (via remote control) and both tanks dump into the combustion chamber. Using simultaneous multiple point high energy injection of both fuel and air at the same time should ensure a good mix. Voila. A 2x mix ready to go.

Light the proverbial match.
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Postby SpudMonster » Wed Sep 27, 2006 9:21 pm

You, my friend, are insane.
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Postby Drew Rowland » Wed Sep 27, 2006 9:30 pm

How long do you expect it to be before this thing is ready to try out? Please post pics as its built.
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Postby D_Hall » Wed Sep 27, 2006 10:17 pm

<blockquote id="quote"><font size="1" face="tahoma,verdana,arial" id="quote">quote:<hr height="1" noshade id="quote">Originally posted by Drew Rowland
[br]How long do you expect it to be before this thing is ready to try out? Please post pics as its built.
<hr height="1" noshade id="quote"></blockquote id="quote"></font id="quote">

A year at the earliest. Possibly as much as three years.

I've got permission to have our welder to work on it when there's nothing else going on but he's a busy man.

Unless... We get actual funding for the project. Unfortunately, the deadline for discretionary funds submissions was last week so I'm too late for this year's pot of money. HOWEVER, in the spring they often have a second go 'round when they decide that some of the projects that they funded earlier (read: now) aren't panning out and decide to cancel them. *IF* I get funding... it could go much faster.

In other news... The trailer I was planning on using has been sitting in a yard rotting for several years. Things don't rot very fast in the desert but still, new tires and such would be needed. No big deal but it costs money. On that front, today I got word that 15 identical trailers in good working order are about to be surplussed. Knowing my evil plans, our transportation guy is going to try to get 2 of them (one for me and one to use simply as a flatbed trailer). If that happens, that'll save a fair chunk of change.
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Postby man_o_brass » Tue Nov 07, 2006 7:54 pm

Not to take anything away from the maniacal genius of this project, but is seems to me that you could cut back on construction time alot by having the barrel slide straight forwards/backwards. If you took the rollers from the proposed barrel superstructure and used them to directly support the barrel, less material would be needed, and fab time would be greatly reduced.

http://i53.photobucket.com/albums/g50/m ... upport.jpg (rollers are blue)

My drawing would need to be rotated 45 degrees, but MS Paint doesn't like to do that. Using a little all-thread to make the roller height adjustable would allow for precision alignment of the barrel and chamber every time.
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