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simple c:b question

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simple c:b question

Unread postAuthor: sjog » Sat Apr 14, 2007 10:21 pm

If chamber has vol. of 5350 ml and my barrel 94" sdr-21 1 1/2"
What is c:b and the chamber vol. in cubic inches.
Numbers elude me, can't du math. THANKS!!
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Unread postAuthor: SpudBlaster15 » Sat Apr 14, 2007 10:43 pm

Your chamber volume is 326.5 cubic inches, and your C:B ratio is 1.75:1.

To convert milliliters to cubic inches, multiply your original value by 0.0610237441.

To find your C:B ratio, divide the chamber volume by the barrel volume.

To find the barrel volume, use the formula V = pi*r^2*L.
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Unread postAuthor: sjog » Sun Apr 15, 2007 8:38 am

Thanks SpudBlaster
I started wtth a long section of pipe and was going to cut to get proper c:b. Is the barrel to long or should it be longer to get proper ratio?
Or is the chamber to big? I did hear that I was to pick barrel length and build chamber to match.
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Unread postAuthor: jimmy101 » Sun Apr 15, 2007 11:19 am

Your barrel sounds like it is too short. How much too short, and how much it really matters, depends on whether this is a combustion of compressed air gun.
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Unread postAuthor: sjog » Sun Apr 15, 2007 5:16 pm

Combustion Map gas 3 sparks
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Unread postAuthor: lukemc » Sun Apr 15, 2007 5:43 pm

[sarcastic] OH! 3 sparks well that make all the difference! for 3 sparks you want a 3.141546467427:1 ratio![sarcastic]

im just kidding. well i didnt run into this problem with my combustion because the pipe was all sch 40 so i just used the od and it was fine because i was comparing apples to apples. if you can give me the id of you SDR pipe i can give yo the volume. generaly for a regulated fuel cannon a .8:1 is good.
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Unread postAuthor: sjog » Sun Apr 15, 2007 5:59 pm

I tried a one word reply it would'nt accept it. So I punched in a few more words.
1.7 " id I think sdr-21 1 1/2" od

Thanks
I just looked on burnt latke it said the ID was 1.7 but the OD is 1.5 > ilooked on rat calc . Not good at math.
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