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mini hybrid win!

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: Gun Freak » Mon Jan 31, 2011 7:17 pm

How do you expect to shove a 4.5mm ball into a 4mm tube?
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Unread postAuthor: Fnord » Mon Jan 31, 2011 7:28 pm

JSR,

If you're going to try a compression-seal method between metals, you might get opening pressure inconsistencies as the casing gets "worn in".
But, something you can also try is chucking the casing in a drill press and squeezing a slight lip into it just above the projectile. It will naturally be smoothed back out during the shot, but depending an the malleability of the metal you're using it should be fairly repeatable.
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Unread postAuthor: linuxexorcist » Mon Jan 31, 2011 7:45 pm

They're pinky and the brain/yes pinky and the brain/one is a genius/the other's insane!

My thinking is that the lead ball is either gonna hold not enough or too much pressure, also the 4mm tube holding the ball could wear down, reducing the lifetime of the cart greatly

Gunfreak, he'll force it in, probably with a hammer or vice
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Unread postAuthor: Ragnarok » Mon Jan 31, 2011 7:54 pm

Gun Freak wrote:How do you expect to shove a 4.5mm ball into a 4mm tube?

Brute force, ignorance, and some Lurpak. :D
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Does that thing kinda look like a big cat to you?
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Unread postAuthor: jackssmirkingrevenge » Mon Jan 31, 2011 11:56 pm

Brian the brain wrote:Naval cannons are rifled... :D


Naval cannons are actually called "rifles", which means the 46cm bore guns of the Yamato class would count :roll: though really past a certain bore they use bagged charges, not cartridges.

You might consider just taking over an unstable African country...


You could have just said "an African country" :D

*ahem*

How do you expect to shove a 4.5mm ball into a 4mm tube?


Using reasonable amount brute force inspired by ignorance, and substituting Lurpak with a slight bevelled edge on the tube (though the little Lurpak guy was trumpeting support in the background), I managed to push it in without great difficulty.

My thinking is that the lead ball is either gonna hold not enough or too much pressure


That's my hunch too, we'll see later this afternoon :)

If you're going to try a compression-seal method between metals, you might get opening pressure inconsistencies as the casing gets "worn in"


True, but don't look at me, I'm not the one sitting with my cereal and vodka spouting random ideas for other spudders to build :roll: :D

"umieścić piłki w życie z!" Image
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Last edited by jackssmirkingrevenge on Tue Feb 01, 2011 2:13 am, edited 1 time in total.
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Unread postAuthor: Insomniac » Tue Feb 01, 2011 12:46 am

jackssmirkingrevenge wrote:Using reasonable amount brute force inspired by ignorance, and substituting Lurpak with a slight bevelled edge on the tube (though the little Lurpak guy was trumpeting support in the background), I managed to push it in without great difficulty.


Which is, clearly, what SHE said...


/content-less post.
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I wonder how much deeper the ocean would be without sponges.
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Unread postAuthor: linuxexorcist » Tue Feb 01, 2011 12:59 am

Brian the brain wrote:Naval cannons are rifled...

so was this:
ImageImage
the Schwerer Gustav: 31.5" barrel, 39 km range, approx 14 rounds per day firerate, built to destroy forts on the french border in WWII, never saw actual combat use, remains largest rifled weapon ever built build a cartridge like that!

perhaps we need to clarify: a handheld, reasonably-operable-while-in-the-standing-position rifle cartridge size
JSR wrote:you could have just said "an African country"

JSR could probably take over for Mubarak, i'm sure the egyptians would be just as unahappy, but only because he spent the entire nat'l defense budget on rebuilding the presidential palace out of epoxy
i can see it now "oh, the banquet will be held as soon as the main hall cures, just wait a little longer"
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Unread postAuthor: jackssmirkingrevenge » Tue Feb 01, 2011 2:12 am

Insomniac wrote:Which is, clearly, what SHE said...


No, that's what I said.

What SHE said was "AAAAAMmmmnnnghhhhhhhrrrr... ooh! ahhhhhh..."

;)

the Schwerer Gustav


I stood next to that shell, humbling.

JSR could probably take over for Mubarak


Mubarak has Abrams tanks on the streets I though all they had were a bunch of antiquated M60s, guess it pays to be buddies with the states, I don't think JSR's puny collection of hybrids can compete.

Seems like they could use an actual epoxy sarcophagus though :(
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Unread postAuthor: linuxexorcist » Tue Feb 01, 2011 2:48 am

whatever happened to
JSR, quoting wikipedia wrote:Risqué double entendre, often wringing innuendo out of perfectly innocent phrases. This is, in theory, over the heads of the children in the audience


i mean, think of the children!
moving on...
mixing the several tonnes pf epoxy to mold a palace would be interesting
what if the wiring's wrong, gotta throw the whole thing out and start over!
it'd be similar to a concrete pour, but you might drift away in the fumes to an epoxy dreamscape,,,
although i'm sure you've been there before, when you cast your current residence at least
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Unread postAuthor: Insomniac » Tue Feb 01, 2011 6:45 am

If you used most of the commercially available glues or resins, I'd wager that the whole thing would inadvertently go up in flames, as the heat from the curing accelerated the process, causing thermal runaway en masse.
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I wonder how much deeper the ocean would be without sponges.
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Unread postAuthor: jackssmirkingrevenge » Tue Feb 01, 2011 7:29 am

linuxexorcist wrote:think of the children!


I would love to but a court order says I mustn't :?

If you used most of the commercially available glues or resins, I'd wager that the whole thing would inadvertently go up in flames, as the heat from the curing accelerated the process, causing thermal runaway en masse.


I was about to suggest that, it's surprising how hot an epoxy mix gets in significant quantities.

you might drift away in the fumes to an epoxy dreamscape


Thermosetting polymer fields forever :D
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Unread postAuthor: ilovefire » Tue Feb 01, 2011 8:35 am

jackssmirkingrevenge wrote:
I was about to suggest that, it's surprising how hot an epoxy mix gets in significant quantities.



i touched the tape on an M&M size blob on some 5min epoxy and it almost burnt me :?
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why make it if it dosent shoot?
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Unread postAuthor: POLAND_SPUD » Tue Feb 01, 2011 10:00 am

"umieścić piłki w życie z!"
google translation fail

True, but don't look at me, I'm not the one sitting with my cereal and vodka spouting random ideas for other spudders to build

:)

ohh BTW I got this...
http://www.miflex.com.pl/pol/generatory/W09-2A.pdf

now how do I wire it ? do I get it right... I need one of the pins and ground?
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Unread postAuthor: jackssmirkingrevenge » Tue Feb 01, 2011 10:28 am

POLAND_SPUD wrote:google translation fail


I figured but it's the thought that counts ;)

now how do I wire it ? do I get it right... I need one of the pins and ground?


Hotwired was fiddling with something similar in one of his videos, perhaps he can help :)

Anyway, about the "forced balls" (:D) cartridge, it's held 20 bar without apparent leaks! Hybrid testing soon :)
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Unread postAuthor: POLAND_SPUD » Tue Feb 01, 2011 10:52 am

Anyway, about the "forced balls" (Very Happy) cartridge, it's held 20 bar without apparent leaks! Hybrid testing soon
who's your daddy ? :D
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