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Combustion operating temperatures

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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Combustion operating temperatures

Unread postAuthor: crazyfreak0075 » Fri Oct 27, 2006 6:24 pm

Quick simple question. I live in Michigan and it getting colder around 42 degress F for the highs. So what is the min. firing temperature. I think it would be safe but better ask. Thanks
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Unread postAuthor: frankrede » Fri Oct 27, 2006 6:45 pm

I wouldnt do it.
Abs maybe not pvc.
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Unread postAuthor: rmrider » Fri Oct 27, 2006 7:10 pm

you can only shoot these in warm temperatures?
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Unread postAuthor: SpudBlaster15 » Fri Oct 27, 2006 7:27 pm

I just shot my ABS cannon in -20*C temperatures. Works fine. I wouldnt do this with PVC.
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Unread postAuthor: benstern » Fri Oct 27, 2006 8:05 pm

The reason is that pvc become extremely brittle at low temperature and will easily shatter.
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Unread postAuthor: rmrider » Fri Oct 27, 2006 10:19 pm

hmmm that sucks...my first gun is PVC and the temps are around 5degrees celsius +/- these days. is it still safe to shoot it? i want to try it out
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Unread postAuthor: crazyfreak0075 » Sat Oct 28, 2006 9:00 am

So let me clarify this. Shooting a pvc gun around 42 F is not safe.
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Unread postAuthor: boilingleadbath » Sat Oct 28, 2006 8:21 pm

It's more brittle.
Of course, some steels are also pretty brittle.

The downside of it being more brittle (by definition, IIRC) is that it can't flex as much and will fracture with a lesser blow. That is, a pneumatic is more likely to blow up if you drop it, and an over-under combustion is more likely to fracture an elbow.

Now, while it might not be a good idea, you'll most likely be fine if you operate a liniar combustion spudgun at depressed temperatures.
...but of course, I'm not an engeineer.
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Unread postAuthor: schmanman » Sat Oct 28, 2006 8:47 pm

hey! I'm in Michigan, too. where are you? I'm in white lake. today we got into the car, and the thermometer said 39* Fahrenheit weather's been crappy lately, but I shot my cannon two days ago, and It was fine. you should be fine. do whatever you are comfortable with.
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Unread postAuthor: crazyfreak0075 » Sun Oct 29, 2006 5:50 pm

Thats cool I live in south lansing. But we own like 10 acres in eaton rapids so I shoot and do stuff there. yeah the weather is crappy.
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