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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 » Sat May 19, 2012 3:49 am

here you go :D

[youtube]http://www.youtube.com/watch?v=_KFBQGl0UCM[/youtube]

Nice work on the brackets btw!
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Unread postAuthor: natas » Sat May 19, 2012 1:24 pm

Found a few more pictures from the building process.


Making treads for the gas inlet

Image


Gas inlet for the fuel rail. (1/2" > 3/4")

Image


Priming the PVC before color coating

Image


Making the internal chamber for the igniter airtight. The black thingy, is the fan connected to the mixing pipe.

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Unread postAuthor: natas » Thu May 24, 2012 10:16 am

Got MAP today :-)

Image


But i think the pressure seems a bit high, what is normal psi / bar in the new map cans ?
The propane was at about 9.5 bar.
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Unread postAuthor: jackssmirkingrevenge » Thu May 24, 2012 10:21 am

Mapp Gas

Other Names: Methylacetylene Propadiene, stabilized
Sp. Gr.: 0.58 @ 16ºC / 60ºF
Vapor Pressure: 94 PSIG @ 21ºC / 70ºF


Hmmm...
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Unread postAuthor: natas » Thu May 24, 2012 10:30 am

Guess 12 bar is a bit high then... :D ... kaboooom...
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Unread postAuthor: jackssmirkingrevenge » Thu May 24, 2012 10:32 am

Liquid MAPP getting into the gauge?
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Unread postAuthor: natas » Thu May 24, 2012 3:12 pm

jackssmirkingrevenge wrote:Liquid MAPP getting into the gauge?


i dont think so, i never load the cannon horisontal.

later on the day i bottomed out the gauge..... put a wet towel on the tank.. and it dropped to 11bar... i never let the tank stand in direct sunlingt, its just to hot in norway these days i guess :-)

at least there was no boiling sounds in the tank :-)
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Unread postAuthor: jackssmirkingrevenge » Thu May 24, 2012 4:23 pm

Look at the curve for propane:

Image

Temperature certainly has some effect ;)
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