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Posted: Thu Mar 15, 2012 11:16 am
by jackssmirkingrevenge
The man makes a good point.

Here's a good reference: http://www.burntlatke.com/strip.html

Posted: Thu Mar 15, 2012 1:29 pm
by natas
well.. a sparkstip is the reason i asked the first question :-)... how to get the whires inside the metall chamber, and still make it airtight. i want to build the cannon so i can convert it to a hybrid on a later stage when i get the balls for it :-)


edit: im from kristiansand

Posted: Thu Mar 15, 2012 2:10 pm
by jackssmirkingrevenge
Threaded hole in the chamber, delrin threaded plug through it, through which the wire goes through. Seal with epoxy, voila :)

Posted: Thu Mar 15, 2012 3:41 pm
by natas
epoxy..... ghettos best friend :-)

Posted: Fri Mar 16, 2012 12:30 am
by jackssmirkingrevenge
natas wrote:epoxy..... ghettos best friend :-)
Not really, composite materials which heavily feature epoxy resins are on the cutting edge of technology.

Do you really want to argue with a man with such large sideburns :D

Image

Posted: Fri Mar 16, 2012 2:08 am
by natas
the size of those sideburns makes me wanna build everything in epoxy....:-)

Posted: Fri Mar 16, 2012 4:03 pm
by SpudFarm
På min hybrid brukte jeg en 3/4" blendeplugg i messing med en sveise tilsett pinne for TIG sveising med en krympestrømpe på, denne isolerte bra nok til at jeg kunne bruke høy spenning på systemet uten overslag.

Boret ett hull i blendepluggen en halv millimeter større enn "stål pinnen" og krympet strømpen på pinnen der hvor det ellers hadde kortsluttet og fyllte hele innsiden av blendepluggen med kjemisk stål (form for epoxy) og bøyde deretter pinnen slik at den nesten berørte messing pluggen på innsiden, da fikk jeg en pålitelig tennplugg.

Denne burde kunne brukes til og lage en enkel gnist stripe.

Da jeg ikke er noe særlig flink til og forklare slike ting med ord må du bare si ifra om du vill ha det tegnet, kan også tegne en enkel skisse av en gnist stripe basert på denne pluggen.

Posted: Fri Mar 16, 2012 5:51 pm
by natas
en krypestømpe var nok altså ? kult... :-)

Posted: Sun Mar 18, 2012 4:39 pm
by SpudFarm
Jepp, ingen problemer så langt jeg hvertfall.

Posted: Mon Mar 19, 2012 6:21 am
by natas
Metering system done :-)

1/4 brass couplings soldered with silver to a 316 pipe and polished, its easy to adjust length if the size is too big.
Volume of the pipe with couplings is 0.36 litres (about 2,1 cubic inch). The idea is that if the meter pipe is big, its possible to use more of the propane before the can is empty.


Image


Feel free to correct me if im going down the wrong path :-)

Posted: Mon Mar 19, 2012 6:24 am
by natas
the soldered pipe :-)

Image


Ill do the final polishing when everything is ready to be assembled.

Posted: Tue Mar 20, 2012 12:16 am
by jackssmirkingrevenge
Shineh!

Looking good, this is going to be a badass combusion :)

Posted: Fri Mar 30, 2012 8:06 am
by natas
i have given up on getting the pvc needed for the cannon i want to build, 3weeks of searching local dealers for parts, and no luck :evil: ..

So i whimped out, and ended up with ordering the pipes from Mike at ulimatespuguns. ( bl520 )

metall work is no problem for me, so ill make the other parts needed when i get the parts

making a 0x cannon in metall makes it too heavy. and pp soil pipes are no good. thats my alternatives.

Posted: Wed Apr 04, 2012 4:47 pm
by natas
im trying to find a tread talking about how much burst disc a normal pvc cannon can take (with ammo in the barrel). and is it safe safe to take a pvc to 1x ? .
im not trying to be spoonfed here, but i have a hard time finding what i look for :-)

Posted: Wed Apr 04, 2012 5:19 pm
by Fnord
1x is technically a normal combustion.
0x would actually mean there's no air in the chamber

If you mean using a normal pvc gun at "2x", or with one additional atmosphere of pressurized air/fuel in it, I would strongly advise against it. If you want to remote-fire it from a distance, ok, but don't try to shoulder the thing.
One member (I think it was noname) blew up a sch80 hybrid with 2x. In theory it can take the pressure and still have a significant safety factor, but there is no way to test pvc pipe for internal defects and fatigue.