SpudFiles

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

Happened to me a few times and I created the thread

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

hows prototyping going?

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:



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

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

Happened to me a few times and I created the thread

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
[youtube][/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!

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

It could have been worse

wait for the chorus

How you manage to have an absurdly obscure link for every occasion never ceases to astound me.

Bueno Estente!

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

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

jackssmirkingrevenge wrote:

Open up a quick-connect fitting. It works just like that, but then with balls instead of a rod.

psycix wrote:but then with balls instead of a rod

Of course we knew that, but well played with the innuendo

Yea, I figured it would be fun to beat you to it by using italic.

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.

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

so much for small bore.

Combine a quickconnect with your epoxy.

Hmmm
Stuff could get interesting here.

psycix wrote:Stuff could get interesting here.

You could get something like this cheaply, but there would still be an effort (and probably epoxy ) 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.