hybrid mixtures

Harness the power of precision mixtures of pressurized flammable vapor. Safety first! These are advanced potato guns - not for the beginner.
User avatar
bighead33
Private 4
Private 4
Posts: 98
Joined: Fri Feb 19, 2010 2:24 pm
Location: Stonemountain, Ga

Fri Feb 19, 2010 2:37 pm

i herd that for my hybrid cannon i am going to use 5x more air than i use propane. is that true
User avatar
jimmy101
Sergeant Major 2
Sergeant Major 2
United States of America
Posts: 3206
Joined: Wed Mar 28, 2007 9:48 am
Location: Greenwood, Indiana
Has thanked: 6 times
Been thanked: 18 times
Contact:

Fri Feb 19, 2010 3:17 pm

No.

http://www.spudfiles.com/forums/hybrid- ... 13602.html

Basically, for a 5X hybrid you inject 5X as much fuel as for a standard (1X) combustion gun. You then pressurize with air to a bit more than 5 ATM. The link above gives more details.

For a propane powered gun there is always about 25 times more air than there is fuel.
Image
User avatar
CpTn_lAw
Corporal 5
Corporal 5
Posts: 987
Joined: Sun Sep 11, 2005 9:10 am
Location: France

Fri Feb 19, 2010 3:26 pm

If you're asking yourself that question, maybe you should work a little more on the principles.
"J'mets mes pieds où j'veux, et c'est souvent dans la gueule."
User avatar
ramses
Staff Sergeant 2
Staff Sergeant 2
United States of America
Posts: 1679
Joined: Thu May 29, 2008 6:50 pm

Fri Feb 19, 2010 4:43 pm

jimmy101 wrote: You then pressurize with air to a bit more than 5 ATM.


It is worth noting that this is absolute pressure, and that we have one ATM (14.7 PSI) all around us. This can be subtracted from the required air pressure.
POLAND_SPUD wrote:even if there was no link I'd know it's a bot because of female name :D
User avatar
jimmy101
Sergeant Major 2
Sergeant Major 2
United States of America
Posts: 3206
Joined: Wed Mar 28, 2007 9:48 am
Location: Greenwood, Indiana
Has thanked: 6 times
Been thanked: 18 times
Contact:

Fri Feb 19, 2010 5:06 pm

ramses wrote:
jimmy101 wrote: You then pressurize with air to a bit more than 5 ATM.


It is worth noting that this is absolute pressure, and that we have one ATM (14.7 PSI) all around us. This can be subtracted from the required air pressure.
Good catch. If your pressure gauge reads zero in air then you pressurize to 4 ATM (your gauge reads PSIG). If it reads 1 ATM in air then you pressurize to 5 ATM (your gauge reads PSIA). Gauges that read PSIG are far more common.
Image
Post Reply