SpudFiles

SPG wrote:I regularly use syringes recreationally*, does this make me insane?

There's recreation and recreation you can actually make an effective launcher with a 1mL syringe and separate needle, just stick the needle into a bar of soap to block it and then attach it to the syringe, press the plugner and pow, instant dart gun.

In the T-piece have you got any kind of "hop-up"/similar to prevent the BBs rolling out the barrel?

In this case no, the mag is for pellets and they don't need to be held in.

If so what about an inline magazine? Basically just a barrel extension running rearwards from the T-piece, with the air from your valve coming up the T instead so that it enters between the first two BBs?

Like this?



I remember you proposing the idea back on spudtech, I had forgotten about it but now that you mention it, it might be just the sort of system that will work well for my upcoming high pressure variation

jackssmirkingrevenge wrote:I don't nick them, I borrow them on a permanent basis

Yes... because I haven't used the phrase "Borrowed indefinitely without permission" myself more than once.

Warning: Link heads to TV Tropes. The site is like Pringles turned up to eleven - after you start, you can never stop reading it. EVER.

jackssmirkingrevenge wrote:There's recreation and recreation

And there's procreation, oh wait, that's a turkey baster isn't it?

jackssmirkingrevenge wrote:Like this?



I remember you proposing the idea back on spudtech, I had forgotten about it but now that you mention it, it might be just the sort of system that will work well for my upcoming high pressure variation

That's exactly it, I just couldn't be bothered to draw it. I imagine you could use a commercially bought hop up for the same thing, but why bother when you can make it? If you could get a reasonable seal behind a magazine follower you could even have the mag airsprung. And if you were planning on making this thing vaguely rifle-like then the magazine itself could go in the stock. I wonder if there's a way to make it detachable, quick release maybe?

PS. As an aside, I'm finding it interesting to see a convergance between repeaters and valved hybrids, this whole set up would work just as well hybridised.

jackssmirkingrevenge wrote:

psycix wrote:So I also did it with a simple T...
I can tell you, results were pleasing...

Then show us! yeeesh! You're the biggest tease I know, and you don't even have breasts!

Check my thread or youtube channel.



@the latest diagram
Maybe that making one little tiny hole in the back of the magazine helps to prevent doublefeeding. The tiny leak will ensure that the pressure behind the ammo is always less then that in front of it, pushing the bb's back during the shot.

If you wanted to be really flash you could throw in a little pop-up bolt like this:



EDIT: Click HERE to see it again, and then just refresh till you're bored.

EDIT: no don't bother, see below

Ooh me likey. Will get hard in practice though. Maybe it should pop up in a cross piece.

Oh your refresh trick doesnt work

Oh your refresh trick doesnt work

Hitting ctrl+f5 (or whatever your browsers "forced refresh" is; look it up) will work.

The pop-up bolt adds unnecessary complexity, if you're going to go through the trouble might as well make a blow-forward valve.

Jack! Woohoo! You finally made the stinking pop-off gun work! Way to go! And it turns out the extra complication of the linkage from the piston to a valve at the inlet to the firing chamber was unnecessary, huh? (That is, the blowgun doesn't overwhelm the valve and make it fart/stick open.) That's nice.

I'm tempted to try building one in steel for 1/4" steel slingshot ammo and 300-400psi... I'm a bit short on cash and time a.t.m., though.

Here's my take on how to load the ammo:



Pop-up bolt?!? Now we've thought of everything! lol.

Skywalker wrote:Jack! Woohoo! You finally made the stinking pop-off gun work! Way to go! And it turns out the extra complication of the linkage from the piston to a valve at the inlet to the firing chamber was unnecessary, huh? (That is, the blowgun doesn't overwhelm the valve and make it fart/stick open.) That's nice.

Thanks

The critical parameters to stop it hanging were having the valve outlet open even when the piston had moved just a fraction, as well as having the piston seat bigger than the outlet.

Congrats Jack! Awesome sound it makes! Fnord had an interesting layout a few pages back (think it was nr 3), that haven't really been discussed. It seems to meet the criterias for it not to hang. What do you guys think?
Again nicely done!

Thanks

Copperboy wrote:Fnord had an interesting layout a few pages back (think it was nr 3), that haven't really been discussed. It seems to meet the criterias for it not to hang. What do you guys think?

This one?



It has a lot of dead space, apparently Fnord has been doing some experimenting in the meantime though which I'm sure he'll share eventually

In the meatime, my third version of this valve for use with the HPA tank (850 psi ) is finally complete and ridiculously overengineered, I'll have a play with it when the epoxy cures and give you the results, keep watching this space

JACK !!!!!! I can't believe you said that, surely you could just fill a lot of the deadspace with epoxy.

keep watching this space

Or fill it up with epoxy like the one in the above diagram.

Cant wait to see it! Dont dare to fail now!

psycix wrote:Cant wait to see it! Dont dare to fail now!

Too late



No pop-pop-pop, just a fish with no eyes.

Dammit.

Similar thing happened with my attempt at a pop-off piloted piston with a very small chamber - maybe it does need an expansion chamber after all, hmmm...