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hybrid cartridge protoype without burst disk

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: POLAND_SPUD » Tue Mar 08, 2011 8:56 am

CZTUCZNY_CHUJ wrote:
It's SZTUCZNY not CZTUCZNY...

can be threaded in standard fittings & they've got threaded shafts
What I was trying to say is that it would help to keep everything servicable and you could use a regular 3/4" or 1" pipe for the main housing. While it wouldn't be easier to add a slit for the charging handle it would definitely survive longer than a copper one

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Unread postAuthor: jackssmirkingrevenge » Tue Mar 08, 2011 9:14 am

POLAND_SPUD wrote:It's SZTUCZNY not CZTUCZNY...


I'm beginning to lose faith in Google translate :roll:

What I was trying to say is that it would help to keep everything servicable and you could use a regular 3/4" or 1" pipe for the main housing. While it wouldn't be easier to add a slit for the charging handle it would definitely survive longer than a copper one.


After my experiences with the "valveless" cartridge pneumatic I'm confident I can get this to work without external forces cycling the bolt, testing due this evening if the cartridge and bolt are sufficiently cured.
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Unread postAuthor: POLAND_SPUD » Tue Mar 08, 2011 10:56 am

external forces cycling the bolt
Ohh I didn't say you've got to use air to extend retract the air cylinder.... I'd use it becasue it is a ready made thing that is good at uhmmm extending and retracting... plus it would make fine tuning easy - you know pump it up to higher/lower pressure
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Last edited by POLAND_SPUD on Tue Mar 08, 2011 11:04 am, edited 1 time in total.
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Unread postAuthor: jackssmirkingrevenge » Tue Mar 08, 2011 10:57 am

Ah, you mean gas spring instead of coil spring?
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Unread postAuthor: POLAND_SPUD » Tue Mar 08, 2011 11:03 am

yeah
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Unread postAuthor: Crna Legija » Tue Mar 08, 2011 11:45 am

POLAND_SPUD wrote:
CZTUCZNY_CHUJ wrote:
It's SZTUCZNY not CZTUCZNY...

@-_-
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get a ps3 and find out :D
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Unread postAuthor: jackssmirkingrevenge » Tue Mar 08, 2011 12:59 pm

OK, this isn't going anywhere - the forces involved are a bit too much.

Here it is at 5x, really weak in terms of power, it destroyed the thick rubber extractor while still slightly chipping the cartridge, and to top it all off the cartridge knocked the camera over :roll:

[youtube]http://www.youtube.com/watch?v=cyxFZQInZMM[/youtube]

I added a spacer to the spring to increase compression and gave it a whirl at 7x, this time with the camera out of harms way. Again, just a dent in a steel sheet but it destroyed the rear epoxy endcap and bent the bolt itself out of shape.

[youtube]http://www.youtube.com/watch?v=aLqv6qiD1Xs[/youtube]

Here's the damage, back to the drawing board...
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Unread postAuthor: JDP12 » Tue Mar 08, 2011 1:04 pm

I think you may need a thicker bolt or better support for it somehow. it seems that that bolt rod is extremely flexible, and susceptible to bending as a result.
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Unread postAuthor: CpTn_lAw » Tue Mar 08, 2011 1:05 pm

Maybe use a tougher spring? Maybe use a prolongation tube, in which the cartridge goes, so that even when it begins to cycle, gases continue to be pushed in the only way possible : the barrel.

? :?
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Unread postAuthor: mark.f » Tue Mar 08, 2011 1:09 pm

What about an air spring? A telescoping cylinder... should be within reach in terms of either building such a thing or using a purpose-made pneumatic cylinder.

I say because threaded rod/bolts are usually more flexible than equivalent sized tubing, or so I've found when building my pump. :roll:
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Unread postAuthor: POLAND_SPUD » Tue Mar 08, 2011 1:41 pm

@mark.f
now the whole world knows that you built a p**** pump
lol

JSR listen to what POLAND_SPUD has suggested - that guy really knows his stuff (yeah, now you're not the only person referring to himself in 3rd person)
:lol:
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Unread postAuthor: jackssmirkingrevenge » Tue Mar 08, 2011 1:44 pm

POLAND_SPUD wrote:(yeah, now you're not the only person referring to himself in 3rd person)
:lol:


JSR is so not going to listen to any of you that he's going to take the cartridge to 8x and blow up the breech :D

[youtube]http://www.youtube.com/watch?v=dQ2zB3PrpPo[/youtube]

That's all for this evening, it's pancake tuesday and I have make bacon fish :)
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Unread postAuthor: Labtecpower » Tue Mar 08, 2011 2:03 pm

and POOF! that was your breach :?
You don't want that next to your face...

I'm looking forward to some new tests!
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Unread postAuthor: saefroch » Tue Mar 08, 2011 2:12 pm

I suggest that you may be able to solve all of the problems by changing the design of the bolt housing, and making the bolt far thicker. Using a much thicker bolt, it could retract into a rear cylindrical housing with a close tolerance, and enclosing the spring entirely in the housing. As I hope you're aware, it's possible to purchase springs with insane spring constants on McMaster...
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Unread postAuthor: POLAND_SPUD » Tue Mar 08, 2011 4:07 pm

It's one of those things that just couldn't have been predicted :D

What are you going to do tomorrow night? :wink:




Wow don't you think it sounds a LOT more menacing in german...?
[youtube]http://www.youtube.com/watch?v=JPqFNQCXF9Y&feature=related[/youtube] Sure I know what they're saying but still it sounds as if they were sending jews to the gas chambers or something
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