SpudFiles

Posted: **Wed Jul 13, 2011 11:27 am**

LeMaudit wrote:"Kurdish" as they say at Patator

Good ol' French casual racism

Can I say duck tape?

No no no!

And if I tell you I'm shopping for some green laser...

Very old hat, what you want is something like this

Posted: **Wed Jul 13, 2011 11:32 am**

Very old hat, what you want is something like this

ohhhhhh.... how the hell did you guess that I had in mind this Predator three dots sight!!

Amazing!

I want one!

(what!? yes darling...)

Green!!

Posted: **Wed Jul 13, 2011 1:37 pm**

LeMaudit; Here is a reasonably priced one that works great in the daylight.
I got one and some others on the forum have them as well. See Moonbogg's combustion pictures and video.

http://www.spudfiles.com/forums/viewtop ... tml#238507

I also have complete 3D CAD drawings for it!
See page 5 in Sketchup Sticky!

http://www.dealextreme.com/p/mystery-jg ... uded-13137

Posted: **Wed Jul 13, 2011 2:10 pm**

Thanks dewey-1!

I'll definitely check those.

Posted: **Wed Jul 13, 2011 5:43 pm**

saefroch wrote:I have (had) a bike pump that had a presta attachment, since I own a bike that has presta tire valves. On the connection, there's one for schrader valves and one for presta. Does that design suffer from the adapter problem?

The bike pump I currently use has something like an adjustable detent that clamps onto either a presta or schrader valve, but it hasn't had any seal damage after being unattached and reattached a great many times.

No, they should be fine. It's only the screw-on adapters I've got, which require a tight O-ring to be pushed over the threads each time it's used.

Posted: **Sat Aug 06, 2011 11:28 am**

Having another go at this with a more precisely defined spark gap:

Posted: **Sun Sep 11, 2011 10:20 am**

Another <s>blind stab at</s> work in progress on this idea following this discussion:

Posted: **Tue Sep 13, 2011 12:14 am**

Some mixed results:

fill rig - win! - no leaks, cartridge held pressure beautifully. Still a bit fiddly but it can be refined.

ignition - fail! - click click click... and I think I know why, might have missed an obvious short point with the retaining pins...

Posted: **Tue Sep 13, 2011 8:14 am**

might have missed an obvious short point with the retaining pins

don't tell me there is a hole all the way through the plug...

if yes then FAIL

Posted: **Tue Sep 13, 2011 10:33 am**

Wow, its amazing how such simple mistakes are overlooked. Glad to hear the fill rig worked. Any pictures of it?

Posted: **Tue Sep 13, 2011 11:41 am**

POLAND_SPUD wrote:don't tell me there is a hole all the way through the plug...

if yes then FAIL

There has to be, otherwise you can't push the pins in far enough to free the plug... going to try with some delrin plugs, which will probably shear if I'm lucky enough to get it to work

Glad to hear the fill rig worked. Any pictures of it?

Here it is, closed and open. The schrader fitting is from my original fill rig, now permanently epoxied in place.

Posted: **Tue Sep 13, 2011 11:49 am**

jackssmirkingrevenge wrote:
POLAND_SPUD wrote:don't tell me there is a hole all the way through the plug...

if yes then FAIL
There has to be, otherwise you can't push the pins in far enough to free the plug... going to try with some delrin plugs, which will probably shear if I'm lucky enough to get it to work

I don't follow why you're using pins

If it needs to be flush then grub screws or even countersunk screws will be usable.

Posted: **Tue Sep 13, 2011 11:59 am**

Linonophobia

but you're right, and threading Delrin is a piece of cake anyway.

Posted: **Tue Sep 13, 2011 12:54 pm**

In my earlier prediction I wrote:going to try with some delrin plugs, which will probably shear if I'm lucky enough to get it to work

One carefully calculated 10x mix later:

[youtube][/youtube]

HAHAHA!

YES!

*ahem*

Of course the delrin pins sheared as predicted and the end plug blew out, but on the plus side:

- the fill rig worked perfectly

- the detent sealed and held pressure, then released the projectile in spite of the end plug blowout.

Good result in my book

now to refine it, I have some ideas to scribble.

Posted: **Tue Sep 13, 2011 1:34 pm**

GET SOME GRUB SCREWS

SpudFiles

hybrid cartridge protoype without burst disk