This is my last planned project here, nothing exceptional or innovative but hey. 55mm bore, 1.30 metre barrel and a 95mm chamber giving a C:B ratio of around 0.7:1 - I'm away for the weekend so it will be tested on Monday.
The endcap is a detail of typical JSR epoxy construction, the end is sealed with a disc of foam cut from a meat tray, over which a roughly 10mm thick layer of epoxy is poured. I added wood screws all around the casting for added strength and adhesion. Ignition is by piezo hacked from a cigarette lighter, I cast a housing using wire wrapped around a foil cup as a contact, in order to make it removable. The second bolt is there to cover a port for fuelling (butane from a lighter refill canister metered with a syringe) and venting.
Test results and damage pics/frustrated rants about another failed project to follow in a few days
edit: It works
[youtube][/youtube]
Posted: Fri Nov 14, 2008 7:40 pm
by Pyro Ninja
True JSR style.
It should be fun, good work.
Posted: Fri Nov 14, 2008 7:51 pm
by Carlman
nice mate!
cant wait for damage!
Posted: Fri Nov 14, 2008 7:58 pm
by mark.f
¡Muy bien!
Quiero esto cañon. ¿Lo vas a darme, no?
Grammar is probably appaling, but yeah... good job. How did you connect the chamber to the barrel?
Posted: Fri Nov 14, 2008 7:58 pm
by Ragnarok
Bona fide JSR Semi-ghetto work - passes muster with me.
Now show us some things poking some holes in other things.
... And now, for your next trick, get your mind above your waist line.
Posted: Fri Nov 14, 2008 8:08 pm
by jackssmirkingrevenge
markfh11q wrote:How did you connect the chamber to the barrel?
Easy, wrapped the barrel tightly with duct tape (and folded paper, otherwise it would have cost me a fortune if it was just tape alone) to the thickness of the inner diameter of the chamber, glue it in with anything (araldite, PVA glue, silicone sealant) then pour epoxy to about 10mm thickness to seal everything in.
... And now, for your next trick, get your mind above your waist line
Like that's ever going to happen
Anyways, I'm off to Lisbon - which to my ill-concealed disappointment, I discovered has apparently got nothing to do with girl-on-girl action - for the weekend, so see you all on Monday
Posted: Fri Nov 14, 2008 8:13 pm
by Gippeto
Where there's a will, (or is that a Jack?) there's a way.
Nicely done Jack, robust looking.
Awaiting monday and the damage shots.
Posted: Fri Nov 14, 2008 8:27 pm
by SpudUke5
Me gusta tu cañón. Tienes muchas cosas para hacerlo. Me parece que la patata va a ir muy lejo. Quiero un canon de combustión pero necesito terminar mi cañón pero no puedo porque no tengo las materiales para terminarlo. Esta es el colmo! Qué combustible vas a usar dispararlo?
What a mouthful (Spanish 3 can be useful)
Posted: Fri Nov 14, 2008 8:53 pm
by jonnyboy
when I saw the title I knew it was from you.
Nice idea with the epoxy. In the picture it looks weird kind of pale orange like pumpkin guts.
Posted: Fri Nov 14, 2008 8:55 pm
by Fnord
You need to put a nice spanish-to-engrish warning label on it.
Also, HA!
Posted: Fri Nov 14, 2008 9:38 pm
by VH_man
Just one question... how does one Fuel/Vent this bugger?
Posted: Mon Nov 17, 2008 3:19 am
by jackssmirkingrevenge
Qué combustible vas a usar dispararlo?
Just one question... how does one Fuel/Vent this bugger?
As indicated in the original post:
The second bolt is there to cover a port for fuelling (butane from a lighter refill canister metered with a syringe) and venting.
_Fnord wrote:Also, HA!
And to think I was so careful! asshole
Can't wait to get back from work to try it out
edit: can't get the @#^$&!#$YU^%&#@%Q!!#@@#@!~!!! ignition to work reliably, damn epoxy and its permanent non-adjustable nature! Ah well, 'acksaw time...
Posted: Mon Nov 17, 2008 4:33 pm
by SpudUke5
jackssmirkingrevenge wrote:
Qué combustible vas a usar dispararlo?
Just one question... how does one Fuel/Vent this bugger?
As indicated in the original post:
The second bolt is there to cover a port for fuelling (butane from a lighter refill canister metered with a syringe) and venting.
_Fnord wrote:Also, HA!
And to think I was so careful! asshole
Can't wait to get back from work to try it out
edit: can't get the @#^$&!#$YU^%&#@%Q!!#@@#@!~!!! ignition to
work reliably, damn epoxy and its permanent non-adjustable nature! Ah well, 'acksaw time...
Aww thats a shame. O well i guess, you'll get it goin eventually. How is the ignition hooked up?
Posted: Mon Nov 17, 2008 5:01 pm
by jackssmirkingrevenge
something about the wiring of the piezo ignitor being too close and the spark is jumping somewhere else, I've taken one apart and JSRsalmorphisised it, hoping that epoxy is a good insulator we'll see what tomorrow brings
Posted: Mon Nov 17, 2008 8:35 pm
by CasinoVanart
Last planned project? Why not go back to the Hybrid Cartridges?
And whats this about not be able to get the ignition to work? Have you tried pressing the little button on top????
