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Project "Sweet Melissa"

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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Project "Sweet Melissa"

Unread postAuthor: HAYLO_Stealer » Tue Nov 07, 2006 5:11 pm

How do i find the volume of my chamber for my gun?
Is there a specific math equation im missing. I need to know so i can correctly tune my propane system.
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Unread postAuthor: Pete Zaria » Tue Nov 07, 2006 5:15 pm

http://www.online-calculators.co.uk/vol ... volume.php .

Just wondering, is this named after the Allman Brothers Band song, "Sweet Melissa"? If so, you have good taste, sir.

Peace,
Pete Zaria.
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Unread postAuthor: HAYLO_Stealer » Tue Nov 07, 2006 5:25 pm

Ye its inspired by the song AND my girlfriend. Im building a modifyed version of your simple cannon with propane but wityh out the whole back section and im usinga spark plug hook ed a BBQ ignighter.
Note all i listen too is 60 to 70 rock and phyc




188.5714285714284 Cubic inches Chamber


Is there a proformence difference from a sparkplug and screws?
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Unread postAuthor: HAYLO_Stealer » Wed Nov 08, 2006 12:01 pm

I have another question Which has more potensial energy
Spark plug
or screws
both are hooked to a BBq ignighter
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Unread postAuthor: killagorrila99 » Thu Nov 09, 2006 3:06 am

Hmmm Both will probably work the same?
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Unread postAuthor: rna_duelers » Thu Nov 09, 2006 4:38 am

Depends were they are placed mainly,or how many there are.
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Unread postAuthor: HAYLO_Stealer » Thu Nov 09, 2006 5:41 pm

set of screws or 1 spark plug which will be tapped to the side
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Unread postAuthor: brumby » Fri Nov 10, 2006 5:28 pm

spark plug is just easier to use, i had screws shoot out of the gun
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Unread postAuthor: abcdefg » Fri Nov 24, 2006 6:16 pm

aerosol=1.5:1
propane=0.8:1
pneumatic= depends on gun

you could have just looked around the site :roll:
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Unread postAuthor: HAYLO_Stealer » Fri Nov 24, 2006 6:42 pm

hmm please if you dont have decent critisism dont open your mouth
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Unread postAuthor: SpudBlaster15 » Fri Nov 24, 2006 7:26 pm

abcdefg wrote:aerosol=1.5:1
propane=0.8:1
pneumatic= depends on gun

you could have just looked around the site :roll:


Dont tell people to use one specific ratio when using aerosol fuels. They all have different energy densities. The 1.5:1 ratio is only optimal for cannons using hair spray and other shitty propellants. Most aerosols cannons benefit from a longer barrel.
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Unread postAuthor: jon2680 » Thu Nov 30, 2006 3:36 pm

screw verses spark plug, I'd check the spark plug for resistance. Your bbq lighter may not have enough juice to make a good spark.
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Unread postAuthor: HAYLO_Stealer » Sat Dec 02, 2006 12:33 pm

well i get a fatter spark but the screws have a longer spark
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Unread postAuthor: HAYLO_Stealer » Mon Dec 18, 2006 4:47 pm

ok 270.4821428571426 is my new volume and in its in inches and i really dont understand that procalc program plz dont flame me or complain but my meter pipe is 6 inches long how much pressure shopuld be in pipe for propane for it to fire correctly plewase i need to know cause i need to fire it to prove a point to my parent or theyll make megive it away
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Unread postAuthor: jjjd » Tue Dec 19, 2006 7:54 am

thats way to short, i have a 300ci chamber and i have a ten inch pipe for it, and with that my tank has to sit at full 90, but its cold were i live so i drop it down to about 45 and just do it twice go to www.burntlatke.com and find the fuel tool
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