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newbie planning to go all out :-)

Post questions and info about combustion (flammable vapor) powered cannons here. This includes discussion about fuels, ratios, ignition systems, safety, and anything else relevant.
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Unread postAuthor: jackssmirkingrevenge » Thu Mar 15, 2012 11:16 am

The man makes a good point.

Here's a good reference: http://www.burntlatke.com/strip.html
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Unread postAuthor: natas » Thu Mar 15, 2012 1:29 pm

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
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Unread postAuthor: jackssmirkingrevenge » Thu Mar 15, 2012 2:10 pm

Threaded hole in the chamber, delrin threaded plug through it, through which the wire goes through. Seal with epoxy, voila :)
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Unread postAuthor: natas » Thu Mar 15, 2012 3:41 pm

epoxy..... ghettos best friend :-)
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Unread postAuthor: jackssmirkingrevenge » Fri Mar 16, 2012 12:30 am

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

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Unread postAuthor: natas » Fri Mar 16, 2012 2:08 am

the size of those sideburns makes me wanna build everything in epoxy....:-)
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Unread postAuthor: SpudFarm » Fri Mar 16, 2012 4:03 pm

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.
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Unread postAuthor: natas » Fri Mar 16, 2012 5:51 pm

en krypestømpe var nok altså ? kult... :-)
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Unread postAuthor: SpudFarm » Sun Mar 18, 2012 4:39 pm

Jepp, ingen problemer så langt jeg hvertfall.
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Unread postAuthor: natas » Mon Mar 19, 2012 6:21 am

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.


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Feel free to correct me if im going down the wrong path :-)
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Last edited by natas on Mon Mar 19, 2012 1:59 pm, edited 3 times in total.
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Unread postAuthor: natas » Mon Mar 19, 2012 6:24 am

the soldered pipe :-)

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Ill do the final polishing when everything is ready to be assembled.
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Unread postAuthor: jackssmirkingrevenge » Tue Mar 20, 2012 12:16 am

Shineh!

Looking good, this is going to be a badass combusion :)
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Unread postAuthor: natas » Fri Mar 30, 2012 8:06 am

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.
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Unread postAuthor: natas » Wed Apr 04, 2012 4:47 pm

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 :-)
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Unread postAuthor: Fnord » Wed Apr 04, 2012 5:19 pm

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.
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