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 61 users online :: 3 registered, 0 hidden and 58 guests


Most users ever online was 155 on Mon Aug 15, 2016 1:40 am

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

The Team
Administrators
Global Moderators
global_moderators.png CS

Advanced Hydrogen Mini Combustion Cannon

Built a combustion cannon? Then post it here! This section is for completed, finished cannons that you have built. Please include pictures and information.
Sponsored 
  • Author
    Message

Advanced Hydrogen Mini Combustion Cannon

Unread postAuthor: rcman50166 » Wed Feb 06, 2008 8:27 pm

This is a new concept I'm trying out. I'm using metered hydrogen (optional oxygen) as the fuel source. I have a fuel cell producing hydrogen and oxygen. Which stores the hydrogen in a syringe. When the syringe is full it manually injects the hydrogen into the chamber at a ratio of 12 to 1. There isn't a sparker yet so I don't have any damage pics or even sure it works. I plan to add a sparker in the future along with a chamber agitator. The agitator does the same thing as a chamber fan but the agitator will fit in the chamber unlike the fan.

(3/12/08 )Edit: Eureka! :idea: It works! After tinkering with the fuel mixture I got it to what is pretty damn close to the golden ratio. The gun is a monster! It tears through soda cans (a baseline test for me) and shatters the bbs upon impact. I figured out that adding oxygen to the mix made it too rich and wouldn't combust. Using atmospheric air the oxygen percentage is less making it closer to ideal combustion mixtures. The only thing I need to improve now is make the chamber smaller. This will make it so that I can use pure oxygen in the chamber instead of having half the chamber filled with atmospheric air. There is bad news, however, which is I currently don't have a working digital camera so vidoes and pictures are currently out of the question. :cry:
  • 0

Attachments
AdvancedHydrogenMiniCombustion2.jpg
The blue thing is the fuel cell. The chamber is a tylenol bottle and the barrel is a pen tube. The syringe is 10ml in volume.
FuelCell2.jpg
This is the fuel cell. It's an expensive thing (about $100) but I have connections and got this free.
FuelCell2.jpg (15.31 KiB) Viewed 4588 times
Last edited by rcman50166 on Wed Mar 12, 2008 4:38 pm, edited 2 times in total.
User avatar
rcman50166
Colonel
Colonel
 
Posts: 697
Joined: Sat Jan 19, 2008 7:11 pm
Location: Bethel, CT
Reputation: 0

Unread postAuthor: jon_89 » Wed Feb 06, 2008 8:34 pm

cant wait to here how it works. can you explain the fuel cell?
  • 0


jon_89
Colonel
Colonel
 
Posts: 607
Joined: Wed Apr 11, 2007 9:50 pm
Reputation: 0

Unread postAuthor: elitesniper » Wed Feb 06, 2008 8:34 pm

ah yes be careful with that cap it may shoot out at you due to the small bore barrel, nice mini though. :wink:
  • 0

User avatar
elitesniper
Brigadier General
Brigadier General
 
Posts: 1090
Joined: Sat Oct 13, 2007 8:40 pm
Reputation: 0

Unread postAuthor: Killjoy » Wed Feb 06, 2008 8:40 pm

The fuel cell looks like on from those little hydrogen powered cars. Looks cool, but watch it, that bottle might not take the pressure to well. I would suggest remote firings first.
  • 0

Stanford Class of 2012

"In the end our society will be defined not only by what we create, but what we refuse to destroy"- John Sawhill

Killjoy
Brigadier General
Brigadier General
 
Posts: 1053
Joined: Sun Nov 12, 2006 12:51 am
Location: New Mexico
Reputation: 0

Unread postAuthor: bigbob12345 » Wed Feb 06, 2008 8:47 pm

That looks like a fun little gun but I agree with killjoy remote fireing at first but I wouldnt even expect it to survive the first fireing but if it does youll have a nice little mini.
  • 0

User avatar
bigbob12345
Major General
Major General
 
Posts: 1516
Joined: Sat Dec 01, 2007 9:13 am
Location: Mercer Island,Washington
Reputation: 0

Unread postAuthor: rcman50166 » Wed Feb 06, 2008 8:49 pm

The cap is what I'm most worried about. But I'm pretty confident with it. Iv'e seen it done before with even larger pill bottles. (Centrum value size) Theer is little to no pressure in the chamber itself. The syringe itself expands to hold the volume of hydrogen. The other output on the hydrogen side goes to the chamber but when filling it a hose clamp is closing the path to the chamber, forcing it to the syringe. When full the clamp is opened and you inject the hydrogen from the syringe, through the fuel cell, and into the chamber. All pressures are ambient.
  • 0

Attachments
fuelcell.gif
As for how the fuel cell works. This is the cell using the hydrogen. Put electricity into the fuel cell and it produces hydrogen. Click to work the animation.
User avatar
rcman50166
Colonel
Colonel
 
Posts: 697
Joined: Sat Jan 19, 2008 7:11 pm
Location: Bethel, CT
Reputation: 0

Unread postAuthor: thespeedycicada » Wed Feb 06, 2008 9:06 pm

but still hydrogen and oxygen has a bit more "oompf" than hairspray so be careful.
  • 0

current projects: co-axial piston valve.Status DONE!
S.P.E.C.S update mk 1 construction begining in febuary all the maths for it are done plans are drawn up and parts are listed.
NEXT project:auto piston valve.
User avatar
thespeedycicada
Lieutenant Colonel
Lieutenant Colonel
 
Posts: 429
Joined: Sun Aug 12, 2007 1:28 am
Reputation: 0

Sponsored

Sponsor
 


Unread postAuthor: Velocity » Wed Feb 06, 2008 9:23 pm

Nice... but I think that you would do more justice to that expensive fuel cell if you put in on a nice mini instead; it would probably have to be around the size of JSR's pen-gun project.
  • 0

User avatar
Velocity
Brigadier General
Brigadier General
 
Posts: 1039
Joined: Tue Feb 07, 2006 5:42 pm
Reputation: 0

Unread postAuthor: OuchProgramme » Wed Feb 06, 2008 9:46 pm

Bad idea...hydrogen is a VERY VERY VERY powerful gas.

IMO, just stick to propane.
  • 0


OuchProgramme
Major
Major
 
Posts: 371
Joined: Sat Jan 12, 2008 7:30 pm
Reputation: 0

Unread postAuthor: FeLeX » Wed Feb 06, 2008 10:22 pm

OuchProgramme wrote:Bad idea...hydrogen is a VERY VERY VERY powerful gas.

IMO, just stick to propane.

Hasn't some one established that hydrogen+oxygen is less powerful than propane+oxygen.
It would be cool to make a pistol using this type of technology and maybe make it kinda of semi auto.
  • 0

User avatar
FeLeX
Captain
Captain
 
Posts: 310
Joined: Sat Mar 10, 2007 10:45 pm
Reputation: 0

Unread postAuthor: DYI » Wed Feb 06, 2008 10:34 pm

Bad idea...hydrogen is a VERY VERY VERY powerful gas.

IMO, just stick to propane.


Ah well, people talking out their asses is quite funny in my opinion. In terms of energy released per volume of gas, propane is more powerful than hydrogen. Hydrogen does have a higher burn rate, and I really wouldn't recommend it for any kind of brittle plastic chamber.

Would it really kill you to use a steel chamber? It would cost about $5, and you'd never have to worry about it breaking.
  • 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: OuchProgramme » Wed Feb 06, 2008 11:46 pm

FeLeX wrote:
OuchProgramme wrote:Bad idea...hydrogen is a VERY VERY VERY powerful gas.

IMO, just stick to propane.

Hasn't some one established that hydrogen+oxygen is less powerful than propane+oxygen.
It would be cool to make a pistol using this type of technology and maybe make it kinda of semi auto.


Back to what DYI said.

Hydrogen has a fast fast combustion rate, which would basically shatter the plastic.
  • 0


OuchProgramme
Major
Major
 
Posts: 371
Joined: Sat Jan 12, 2008 7:30 pm
Reputation: 0

Unread postAuthor: jon_89 » Thu Feb 07, 2008 1:50 am

Would a gun the size of Jacks pen gun be powerful with hydrogen though? It would be cool though to have something so small and compact. :twisted: Do you have the specs for the fuel cell?
  • 0


jon_89
Colonel
Colonel
 
Posts: 607
Joined: Wed Apr 11, 2007 9:50 pm
Reputation: 0

Unread postAuthor: flamerz14 » Thu Feb 07, 2008 4:14 am

OR... go build a hybrid with that fuel cell. i mean, come on, you have hydrogen and oxygen. Just need a little bit of metering thats all :twisted:
  • 0

well, this isn't much isn't it?

flamerz14
Captain
Captain
 
Posts: 322
Joined: Thu Nov 30, 2006 11:02 pm
Reputation: 0

Unread postAuthor: rcman50166 » Thu Feb 07, 2008 6:27 am

Well I'm trying this cannon without oxygen injection. This will make it a little less powerful. The bottle is slightly flexible and thick. It's actually surprisingly thick. The perfection combo, I think, kinda like a spring is to metal. The fuel cell is a slow charge fuel cell. It takes about 15s/mL. It wouldn't be practical for anything larger than this. I have a larger one which charges at a rate of 1mL/s. Even that is impractical for the average spud gun. The fuel cell required would have to be at least 20mL/s. Plus look up the pringles can hydrogen experiment. A pringles can can survive a combustion I'm sure this will hold.
  • 0

User avatar
rcman50166
Colonel
Colonel
 
Posts: 697
Joined: Sat Jan 19, 2008 7:11 pm
Location: Bethel, CT
Reputation: 0

Next

Return to Combustion Cannon Database

Who is online

Registered users: Bing [Bot], MSNbot Media, Yahoo [Bot]

Reputation System ©'