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"valveless" cartridge concept

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Unread postAuthor: jackssmirkingrevenge » Sun Jul 18, 2010 11:45 am

Insomniac wrote:I just had to say that about three or four times now, I've seen this thread in the 'recent topics' list, where the title has been conveniently shortened to 'valveless car'. I keep clicking it thinking that someone's developed a new kind of engine :D


Happened to me a few times and I created the thread :roll:

And yes, there are "valveless" wheeled vehicles, no need to be such a wankel ;)

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Unread postAuthor: jakethebeast » Sun Jul 25, 2010 4:34 pm

hows prototyping going?
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Unread postAuthor: jackssmirkingrevenge » Mon Jul 26, 2010 12:46 am

jakethebeast wrote:hows prototyping going?


It isn't, I've shelved the idea as it turned out to be more than a little fiddly in practice. At the moment I'm thinking about preloaded carts along these lines:

Image

Before I do that though, I want to "max out" the concept in a single shot HPA launcher with a long barrel and large chamber, to see if I can better the results I had a achieved with my 6mm burst disk launcher ;)
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Unread postAuthor: Insomniac » Mon Jul 26, 2010 1:00 am

jackssmirkingrevenge wrote:
Insomniac wrote:I just had to say that about three or four times now, I've seen this thread in the 'recent topics' list, where the title has been conveniently shortened to 'valveless car'. I keep clicking it thinking that someone's developed a new kind of engine :D


Happened to me a few times and I created the thread :roll:

And yes, there are "valveless" wheeled vehicles, no need to be such a wankel ;)


Yeah I've seen that car before. I particularly like this video, where they've replaced the original audio with that of.... a turbine jet :lol:
[youtube]http://www.youtube.com/watch?v=clOmc3WI5fk[/youtube]

EDIT: And yes Ragnarok, I'm aware of Wankel engines... I just figured that a topic wouldn't spring up about a valveless car featuring an already well established form of engine.


JSR, I'm dissapointed. That pun was terrible!
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Unread postAuthor: jackssmirkingrevenge » Mon Jul 26, 2010 3:15 am

Mikki Disco wrote:JSR, I'm dissapointed. That pun was terrible!


It could have been worse ;)

wait for the chorus :D
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Unread postAuthor: Insomniac » Mon Jul 26, 2010 3:38 am

How you manage to have an absurdly obscure link for every occasion never ceases to astound me. :D
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Unread postAuthor: POLAND_SPUD » Mon Jul 26, 2010 3:58 am

Bueno Estente! :wink:

It isn't, I've shelved the idea as it turned out to be more than a little fiddly in practice

What was the problem ?? I think a simple blowforward bolt would be enough to load cartridges
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Unread postAuthor: jackssmirkingrevenge » Mon Jul 26, 2010 4:30 am

POLAND_SPUD wrote:What was the problem?


It needs moar adjustability - I need to a able to tweak pop-off pressure, plus having a breech seal for the cartridge means quite a lot of friction.

I don't want to start at the deep end, need more experience actually building some more valveless prototypes before moving to more advanced setups.

I think a decent high velocity airsoft calibre launcher will be enough to inspire me, watch this space :)
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Unread postAuthor: psycix » Mon Jul 26, 2010 2:48 pm

jackssmirkingrevenge wrote:Image

Open up a quick-connect fitting. It works just like that, but then with balls instead of a rod.
:roll:
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Unread postAuthor: jackssmirkingrevenge » Mon Jul 26, 2010 3:08 pm

psycix wrote:but then with balls instead of a rod


Of course we knew that, but well played with the innuendo :P :D
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Unread postAuthor: psycix » Tue Jul 27, 2010 3:36 pm

Yea, I figured it would be fun to beat you to it by using italic. :D
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Unread postAuthor: jackssmirkingrevenge » Tue Jul 27, 2010 10:41 pm

On a more serious note, recent testing suggests that a couple of balls may well be the solution as opposed to a single rod, which only puts pressure on one side and does not allow proper sealing at high pressures.
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Unread postAuthor: ramses » Wed Jul 28, 2010 9:43 am

If you use a quick connect, you don't even need epoxy! the quarter inch ones should work with a .4325" projectile (basically 11mm) :D

so much for small bore. :twisted:
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Unread postAuthor: psycix » Wed Jul 28, 2010 3:11 pm

Combine a quickconnect with your epoxy.

Hmmm
Stuff could get interesting here.
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Unread postAuthor: jackssmirkingrevenge » Thu Jul 29, 2010 12:12 am

psycix wrote:Stuff could get interesting here.


You could get something like this cheaply, but there would still be an effort (and probably epoxy :roll:) involved in connecting it to the barrel. Unless of course, it was on a cartridge and didn't actually need to be connected to the barrel.... hmmm... but still, you'd need to add a seal for the projectile.

I think in the circumstances, making your own would be much quicker.
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