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Propane problems.

Discuss miniature cannons built from things such as pill bottles and pen caps.
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Propane problems.

Unread postAuthor: SpeedyFerrite » Fri Apr 13, 2007 5:13 am

I'm having a bit of problems with propane, I've tried inserting anything ranging from 1 percent of the volume of the mini to about 10 percent, still none of the mixtures went boom, I did get a spark, does anyone know what I could be doing wrong?

*edit* oh yeah, I'm using an Afterbite stick as a chamber and a spark plug as the ignition source.
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Unread postAuthor: FeLeX » Fri Apr 13, 2007 7:28 am

How did you measure it? Did you use a syringe? Mini are pretty tricky to get to work.
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Unread postAuthor: BC Pneumatics » Fri Apr 13, 2007 7:34 am

Your mix just isn't right. Minis are tricky, so make sure you vent well and measure precisely.
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Unread postAuthor: SpeedyFerrite » Fri Apr 13, 2007 7:57 am

FeLeX wrote:How did you measure it? Did you use a syringe? Mini are pretty tricky to get to work.


I used a syringe yes, Maybe I need to remeasure it, or use a fuel like alcohol.

On another note.
I've already made a cool stock, pictures when it's painted.
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Unread postAuthor: WOW!! » Fri Apr 13, 2007 12:49 pm

For minis I have done is spray it in the air, then run the mini were you sprayed it in the air. It kind of works. What is the volume of it?
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Unread postAuthor: FeLeX » Fri Apr 13, 2007 12:59 pm

Calculate its volume and then calculate how much propane you need at 4%. Figure out how much of the sytinge that is and Voila.
Buy the lighter refiler butane thingy works really good with them syringes.
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Unread postAuthor: SpeedyFerrite » Mon Apr 16, 2007 11:45 am

Right, the chamber was way to small, I needed less than a mililiter of propane, I got a larger chamber and it works now. :)
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Unread postAuthor: FeLeX » Mon Apr 16, 2007 7:16 pm

Nice, glad to hear it worked. Did you calculate the right volume and everything? You should post it on minis.
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Unread postAuthor: SpeedyFerrite » Tue Apr 17, 2007 2:45 am

FeLeX wrote:Nice, glad to hear it worked. Did you calculate the right volume and everything? You should post it on minis.


Yeah, it fully works now, well worked, I disintegrated the end cap with a little aid of a wall.
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Unread postAuthor: Scotty » Sat Jun 16, 2007 11:15 pm

I have a mini of only 22cc and it fires every time with 1/2 a cc of butane, it shoots q tips approx 40 feet at an upwards trajectory of about 20 degrees.

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