Login    Register
User Information
Username:
Password:
We are a free and open
community, all are welcome.
Click here to Register
Sponsored
Who is online

In total there are 60 users online :: 3 registered, 0 hidden and 57 guests


Most users ever online was 218 on Wed Dec 07, 2016 6:58 pm

Registered users: Bing [Bot], Google [Bot], Yahoo [Bot] based on users active over the past 5 minutes

The Team
Administrators
Global Moderators
global_moderators.png CS

Gasoline?

Post questions and info about combustion (flammable vapor) powered cannons here. This includes discussion about fuels, ratios, ignition systems, safety, and anything else relevant.
Sponsored 
  • Author
    Message

Gasoline?

Unread postAuthor: magnum9987 » Tue Jun 10, 2008 2:49 pm

Gasoline is used in cars for the large amount of gases they give off. But would it be safe for use in a combustion gun? If atomized I believe it could be. The only problem would be the large amount of heat given off.
  • 0

http://www.spudfiles.com/forums/viewtop ... Revolution in the absolute is not initiated by swords, guns, and bullets, but by words-
The New RobesPierre
User avatar
magnum9987
1st Lieutenant
1st Lieutenant
 
Posts: 274
Joined: Wed May 07, 2008 5:02 pm
Reputation: 0

Unread postAuthor: FLONE » Tue Jun 10, 2008 2:57 pm

Gotta be some less stinky alternatives that would give as much power. How about Heet gas line anti freeze, 99% Methanol, or starting fluid.
  • 0


FLONE
Private
Private
 
Posts: 18
Joined: Fri Apr 25, 2008 4:34 pm
Reputation: 0

Unread postAuthor: Spuddin » Tue Jun 10, 2008 3:00 pm

gasoline should burn clean as long as u atomize it pretty good like u said, i've used a spray bottle to prime a 3 wheeler engine before. a chamber fan would help i would think. as for the heat i dont think that would be a problem.
  • 0

User avatar
Spuddin
Donating Member
Donating Member
 
Posts: 262
Joined: Wed May 16, 2007 1:28 pm
Location: Oklahoma
Country: United States (us)
Reputation: 0

Unread postAuthor: magnum9987 » Tue Jun 10, 2008 3:00 pm

well, another factor would be economy. the 1 gallon for less than 4 dollars would guaranteed cost less than any other fluid. Not to mention the huge amount of shots you can get with that gasoline.
  • 0

http://www.spudfiles.com/forums/viewtop ... Revolution in the absolute is not initiated by swords, guns, and bullets, but by words-
The New RobesPierre
User avatar
magnum9987
1st Lieutenant
1st Lieutenant
 
Posts: 274
Joined: Wed May 07, 2008 5:02 pm
Reputation: 0

Unread postAuthor: psycix » Tue Jun 10, 2008 3:53 pm

Heat is EXACTLY the thing you want.
Heat = pressure.
Pressure = force
Force = acceleration
Acceleration = Flying spud.

Propane gives off about the same heat as gasoline, dont bother about that.
Also, the heat lasts very short, the combusted gases in a cannon are cooled down within a second.
And because of the heat capacity of air (and generally all gases due to their low density) is so low, the amount of thermal energy isnt large enough to melt PVC. When the air in the chamber is like hundreds of degrees C and gives off all that energy to the chamber walls, the chamber walls temperature rises no more then just a few degrees. (Have to run a calculation on that one, it may be more or even way less, but you get the point)

The only problem is to get it atomized.
  • 0

Till the day I'm dieing, I'll keep them spuddies flying, 'cause I can!

Spudfiles steam group, join!
User avatar
psycix
Donating Member
Donating Member
 
Posts: 3684
Joined: Mon Jun 25, 2007 7:12 am
Location: The Netherlands
Reputation: 0

Unread postAuthor: magnum9987 » Tue Jun 10, 2008 3:56 pm

Any spray bottle could atomize gasoline. So gasoline would make good fuel.
  • 0

http://www.spudfiles.com/forums/viewtop ... Revolution in the absolute is not initiated by swords, guns, and bullets, but by words-
The New RobesPierre
User avatar
magnum9987
1st Lieutenant
1st Lieutenant
 
Posts: 274
Joined: Wed May 07, 2008 5:02 pm
Reputation: 0

Unread postAuthor: Davidvaini » Tue Jun 10, 2008 4:02 pm

gas has been used in combustions since they started. Its not really that dangerous and it works quite well.
  • 0

User avatar
Davidvaini
Major General
Major General
 
Posts: 1315
Joined: Tue May 29, 2007 8:58 pm
Reputation: 0

Sponsored

Sponsor
 


Unread postAuthor: DYI » Tue Jun 10, 2008 4:19 pm

It's not quite as powerful overall as propane, and would be more difficult to meter and mix properly, as it's a liquid at room temperature. If these challenges could be overcome, however, it could make for a very economical fuel.
  • 0

Spudfiles' resident expert on all things that sail through the air at improbable speeds, trailing an incandescent wake of ionized air, dissociated polymers and metal oxides.
User avatar
DYI
Lieutenant General
Lieutenant General
 
Posts: 2861
Joined: Sat Jul 07, 2007 8:18 pm
Location: The People's Republic of Canuckistan
Country: Turks and Caicos Islands (tc)
Reputation: 9

Unread postAuthor: Intel Xeon » Tue Jun 10, 2008 4:44 pm

Skim off some of the fumes hat accumulate in a sealed container.
  • 0


Intel Xeon
Sergeant
Sergeant
 
Posts: 84
Joined: Sat Mar 17, 2007 9:43 pm
Location: Philly, PA. (home's in Worcester,MA)
Reputation: 0

Unread postAuthor: starman » Tue Jun 10, 2008 4:46 pm

Why go to the trouble of having to atomize or carburate gasoline for your spud gun when propane is a clean, cheap, easy to meter, more powerful, ready to go fuel?
  • 0

User avatar
starman
Donating Moderator
Donating Moderator
 
Posts: 3041
Joined: Wed Dec 12, 2007 12:45 am
Location: Simpsonville, SC
Reputation: 0

Unread postAuthor: benstern » Tue Jun 10, 2008 4:49 pm

0.12ml per liter of chamber volume is needed for proper mix.
  • 0

User avatar
benstern
Donating Member
Donating Member
 
Posts: 909
Joined: Wed Sep 21, 2005 8:24 pm
Reputation: 0

Unread postAuthor: jimmy101 » Tue Jun 10, 2008 5:56 pm

Nothing wrong with gasoline as a fuel, other than practicality. Like others have said, the energy content per unit chamber volume is essentially identical to propane. The peak temperature and pressure aren't much different than any other hydrocarbon fuel. Heck, propane and gasoline are so interchangeable that most gasoline engines can be run on propane with only minimal modifications.

Benstern posted what is probably the most important limitation of gasoline as a spud gun fuel. 0.18ml/100in^3 of chamber. A drop from a "typical" eye dropper is about 0.1ml. Since gasoline evaporates so quickly it is pretty hard to get it to even stay in an eyedropper.

Getting the gas to evaporate isn't all that hard if you have a chamber fan.


Hmmm, an automotive fuel injector, high pressure pump, small reservoir of gasoline, 12V power supply ...
  • 0

Image

jimmy101
Lieutenant General
Lieutenant General
 
Posts: 3130
Joined: Wed Mar 28, 2007 9:48 am
Location: Greenwood, Indiana
Country: United States (us)
Reputation: 7

Unread postAuthor: Boom_erang » Tue Jun 10, 2008 10:20 pm

I had some white gas (camping fuel) in a spray bottle and I had intended to try it out with my PC. From what I understand, white gas is basically pure gasoline.

Anyway, long story short, the damn stuff dissolved part of the spray bottle - I guess there were some parts inside the spray pump thingie that are soluble in gasoline... :(
  • 0

User avatar
Boom_erang
Corporal
Corporal
 
Posts: 61
Joined: Fri Apr 25, 2008 2:26 pm
Reputation: 0

Unread postAuthor: starman » Tue Jun 10, 2008 10:46 pm

jimmy101 wrote:.....Hmmm, an automotive fuel injector, high pressure pump, small reservoir of gasoline, 12V power supply ...


Using fuel injectors has been on the super double secret probation :) drawing boards here at Starfire.... :roll: for propane though. Just have to get one and play with it some...don't think you would need as fancy an electronic control that's required in a car engine...activate for the right time is all. They are in the neighborhood of $60-100 depending on the model.
  • 0

User avatar
starman
Donating Moderator
Donating Moderator
 
Posts: 3041
Joined: Wed Dec 12, 2007 12:45 am
Location: Simpsonville, SC
Reputation: 0

Unread postAuthor: jimmy101 » Wed Jun 11, 2008 12:08 pm

starman wrote:Using fuel injectors has been on the super double secret probation :) drawing boards here at Starfire.... :roll: for propane though. Just have to get one and play with it some...don't think you would need as fancy an electronic control that's required in a car engine...activate for the right time is all. They are in the neighborhood of $60-100 depending on the model.

Ya, for electronic control a 555 timer would work great, or just a pushbutton switch though the reproducability would suck with a pushbutton.

I wonder if you can get the injector and pump off a junked car?
I wonder if it should be a direct injector or an indirect injector (on the car)?
  • 0

Image

jimmy101
Lieutenant General
Lieutenant General
 
Posts: 3130
Joined: Wed Mar 28, 2007 9:48 am
Location: Greenwood, Indiana
Country: United States (us)
Reputation: 7

Next

Return to Combustion Cannon Discussion

Who is online

Registered users: Bing [Bot], Google [Bot], Yahoo [Bot]

Reputation System ©'