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Question about meter calculators

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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Question about meter calculators

Unread postAuthor: spudman029 » Wed Mar 19, 2008 1:47 pm

Hey all. I used to be a regular member of the spudtech forums. After being out of the hobby for a while, I've decided to rebuild my old propane combustion (it was a complete failure). Unfortunately, I've forgotten most of the information(lol). It's been a long time. I remember there being an online calculator for propane combustions in regards to chamber volume and atmospheric pressure. I've searched for the link to no avail. Can anyone point me in the right direction?

Thanks
-aaron.
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Unread postAuthor: SpudBlaster15 » Wed Mar 19, 2008 1:57 pm

For atmospheric pressure propane combustion launchers, use the formula Pressure<sub>meter</sub> = Volume<sub>chamber</sub>*0.042/Volume<sub>meter</sub>*14.7.

To find the volume of the chamber and meter, use the formula Volume = Pi*radius<sup>2</sup>*length.
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Unread postAuthor: spudman029 » Wed Mar 19, 2008 2:16 pm

Thanks for the formula. What is 0.042? And still, does anyone know of the online calculator from the old spudtech forum?
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Unread postAuthor: fireman565 » Wed Mar 19, 2008 3:18 pm

Here's some of the Calcs listed in the 'Other' section of Spudfiles listed at the top of the page.
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Unread postAuthor: spudman029 » Wed Mar 19, 2008 3:30 pm

Ah. There they are. Ratcalc and Fueltool from Burnt Latke. Thanks.
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