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Barrel to Chamber 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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Barrel to Chamber Ratio?

Unread postAuthor: SpudChucker24 » Sat Feb 09, 2008 8:26 pm

I dont really get all this math and calculators say my ratio is ridiculous. I have a 10inch long 4inch diameter chamber and a 4 foot barrel 1.5 diameter. Am i getting as much power as i could be getting? If not tell me how i could please.
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Last edited by SpudChucker24 on Sat Feb 09, 2008 8:32 pm, edited 1 time in total.
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Unread postAuthor: bigbob12345 » Sat Feb 09, 2008 8:31 pm

Tell us the diameter of the chamber and barrel
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Unread postAuthor: daberno123 » Sat Feb 09, 2008 8:32 pm

find the area of your chamber and divide by the area of you barrel. .8:1 is the most efficient
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Unread postAuthor: bigbob12345 » Sat Feb 09, 2008 8:35 pm

First you have to say *facepalmheaddeskcombo* daberno :lol:
And then you do it u77r jnp;egvyhazu

edit were did your post go
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Unread postAuthor: daberno123 » Sat Feb 09, 2008 9:03 pm

i felt like being nice so i edited it.

But really it is a *facepalmheaddeskcombo* type of post

iu malcsdfg; lad
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Unread postAuthor: dewey-1 » Sat Feb 09, 2008 10:14 pm

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Last edited by dewey-1 on Sun Apr 20, 2008 1:46 pm, edited 1 time in total.
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Unread postAuthor: SpudChucker24 » Sat Feb 09, 2008 10:39 pm

I dont want to seem lazy but i dont know hove to calculate the area so could some one tell me if its close to .8:1? Or what the actual ratio is. By the way here are some pics.

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Unread postAuthor: daberno123 » Sat Feb 09, 2008 10:51 pm

isn't that right?

I looked in the wiki and it said the c:b ratio=volume of chamber/volume of barrel.

what was wrong about my first post?
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Unread postAuthor: ralphd » Sun Feb 10, 2008 12:21 am

My ratio before I went propane was 1.5 to 1. After the switch to propane I noticed it was a lot louder. That is when I was told that 1.5 to 1 is fine for Spray-n-pray but propane needs .8 to 1. I still use the original barrel because I like the noise.
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Unread postAuthor: c19o » Sun Feb 10, 2008 12:38 am

edit: Oh my browser didn't load everything. sorry
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Last edited by c19o on Sun Feb 10, 2008 2:19 am, edited 1 time in total.
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Unread postAuthor: Carlman » Sun Feb 10, 2008 12:53 am

edit **wrong info**
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Unread postAuthor: SpudChucker24 » Sun Feb 10, 2008 2:13 am

According to SpudTool calculator i have a 2.32:1 ratio. This cant be right can it?
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Unread postAuthor: dewey-1 » Sun Feb 10, 2008 10:33 am

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Unread postAuthor: DYI » Sun Feb 10, 2008 10:40 am

Well, with some grade 8 level mathematics, a McMaster-Carr pipe schedule information sheet, and the trusty Windows Calculator, I've determined your C:B ratio to be 1.3:1, with the stats you gave. Keep in mind that the bell reducer will add a bit of volume to the chamber, but you must have done something wrong on the calculator.

And for future reference, because no one else has said it yet, the formula for volume of a cylinder is (pi*r^2*length).
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Unread postAuthor: bigbob12345 » Sun Feb 10, 2008 11:02 am

SpudChucker24 wrote:According to SpudTool calculator i have a 2.32:1 ratio. This cant be right can it?


dont use the spudtool calculator it doesnt work right if you want to use a calculator the most accurate one is the burnt latke one.
I just calculate it myself i learnt how to find the volume of a cylinder in 6th grade every body says 8th grade but maybe I was in a special school or something. :D

Hmm I got 1.68:1 must of done something wrong Ill recalculate.

Edit:I did do something wrong its actually 1.3:1 just what DYI said.
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