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Chamber To Barrel Ratio

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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Chamber To Barrel Ratio

Unread postAuthor: JDSpud » Thu Jan 18, 2007 9:09 am

When your building a regular combustion spud gun, what raitio should you use between the area of the chamber and the barrel.

~JDSpud
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Unread postAuthor: garrettee » Thu Jan 18, 2007 9:25 am

I'm really not tring to be a d*ck, but search old posts(search) and check the Spudwiki section because it's very useful.
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Unread postAuthor: Pete Zaria » Thu Jan 18, 2007 6:14 pm

It depends on the fuel.

As Garrattee said, you should search the forums and read the wiki. There's lots of info on this.

It's rumored (or should I say, agreed upon) that between 1:1 and 1.5:1 is best for hairspray and aerosol combustions, while .8:1 - 1:1 is best for metered propane. Keep in mind, if your chamber is too big you don't loose power - you just make more noise. For this reason I always tend to go a little chamber-heavy...

Peace,
Pete Zaria.
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Unread postAuthor: jjjd » Fri Jan 19, 2007 1:23 pm

yeah search it up next time please
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Re: Chamber To Barrel Ratio

Unread postAuthor: dgr-c » Fri Jan 19, 2007 7:48 pm

JDSpud wrote:When your building a regular combustion spud gun, what raitio should you use between the area of the chamber and the barrel.

~JDSpud


Lighten up guys. He didn't ask how many people would like to tell me to go f*ck myself.

Here's some research
http://www.burntlatke.com/launch.html

Try this online calculator
http://www.burntlatke.com/ratcalc.html
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Unread postAuthor: Bluetooth » Fri Jan 19, 2007 7:57 pm

I agree that he should have searched too but they weren't being too mean. 1.5:1 (even for metered propane Pete :wink:) is a powerful ratio .8:1 is very efficient. The "best" fuel mix is 4.3 (don't ask why its such an odd number, it's
from Burnt Latke and he does bunches of tests to prove his data).
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Unread postAuthor: boilingleadbath » Sat Jan 20, 2007 2:56 pm

JDSpud, you probably meant volume, in which case all of the above responses are correct.

However, if you acctualy meant <b>area</b>, it's another beast - and the response is "as big of a chamber diameter as is practical".
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