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ABS with Metered Propane

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: Novacastrian » Fri Sep 21, 2007 10:10 pm

Adding a burst disc would have very little effect on increasing the pressure spike in a normal combustion :?
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Unread postAuthor: noname » Fri Sep 21, 2007 11:05 pm

Makes it one hell of a lot louder though. :P
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Unread postAuthor: Novacastrian » Fri Sep 21, 2007 11:14 pm

noname wrote:Makes it one hell of a lot louder though. :P


Agreed :lol:
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Unread postAuthor: MikeNice » Fri Sep 21, 2007 11:24 pm

very agreed . . . very loud . . .
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Unread postAuthor: Canadian Spudder » Mon Sep 24, 2007 6:44 pm

Would using a 4" chamber vs. a 3" chamber effect performance? For example using a 4", 12" long chamber instead of a 3", 24 " long one.
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Unread postAuthor: SpudBlaster15 » Tue Sep 25, 2007 1:40 am

A short, fat chamber is thought to be advantageous, as the fuel mixture will react within a shorter time frame. Faster rate of combustion is hypothesized to increase the performance of a launcher..
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Unread postAuthor: psycix » Tue Sep 25, 2007 10:08 am

I think a burst disk is useful on combustions wich are long and small diameter chamber. This is because the pressure is builded up more slow in those chambers (slow combustion rate). The disk will hold it for some time to delay the release and allow more pressure to be builded before the projectile starts moving.
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