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 52 users online :: 4 registered, 0 hidden and 48 guests


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

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

The Team
Administrators
Global Moderators
global_moderators.png CS

Fuel Meter Volume To Combustion Chamber Volume?

Post questions and info about hybrid (compressed gas with fuel) powered cannons here. This includes discussion about fuels, ratios, ignition systems, build types, safety, and anything else relevant.
Sponsored 
  • Author
    Message

Fuel Meter Volume To Combustion Chamber Volume?

Unread postAuthor: spudkilla224 » Sun Oct 25, 2009 5:42 pm

Hello everyone, I am new to the hybrid side of potato cannons. And I have searched all over spudfiles, the spudtech archive and google and the wiki, and have not found anything that would tell me how I would calculate the fuel meter size to the combustion chamber size of a hyrbid cannon? :?

Any help would be appreciated!
  • 0


spudkilla224
Corporal
Corporal
 
Posts: 65
Joined: Wed Mar 19, 2008 8:04 pm
Reputation: 0

Unread postAuthor: ramses » Sun Oct 25, 2009 6:08 pm

Just like a normal combustion, except you would multiply the pressure or volume of the meter by the mix number you want. For example, if you want an 8x hybrid, you would multiply by 8. Hope that helped!
  • 0

POLAND_SPUD wrote:even if there was no link I'd know it's a bot because of female name :D
User avatar
ramses
Major General
Major General
 
Posts: 1679
Joined: Thu May 29, 2008 6:50 pm
Reputation: 3

Unread postAuthor: spudkilla224 » Sun Oct 25, 2009 6:12 pm

Oh ic! I thought about that but I didn't think I was correct. so basically i should design the meter for the Highest mix i want to shoot at?
  • 0


spudkilla224
Corporal
Corporal
 
Posts: 65
Joined: Wed Mar 19, 2008 8:04 pm
Reputation: 0

Unread postAuthor: kjjohn » Sun Oct 25, 2009 6:22 pm

Download HGDT, enter in the specs of your cannon, and then go to the load/mix calculator in the tools menu.
  • 0

User avatar
kjjohn
1st Lieutenant
1st Lieutenant
 
Posts: 270
Joined: Sat Jul 11, 2009 3:54 pm
Reputation: 0

Unread postAuthor: ramses » Sun Oct 25, 2009 6:23 pm

It would be a good idea to design the meter to work at around the max propane pressure for the highest mix you want. That way, you can turn down the pressure and get a lower mix with the same meter tube. The propane pressure you use should be dictated by the lowest operating temperature you can foresee.

Image

If that pressure is easily by the mix number, you make life easier on yourself. Ex. at 100psi, it will give you enough fuel for a 10x mix. That way, 6x=60psi, 7x=70psi, etc.

Hybrid meters can be more touchy than normal combustion meters, so it would be a good idea to measure the chamber volume with water or oil, and do the same for the meter.

obviously, don't make your hybrid out of PVC. A PVC meter should work okay though.
  • 0

POLAND_SPUD wrote:even if there was no link I'd know it's a bot because of female name :D
User avatar
ramses
Major General
Major General
 
Posts: 1679
Joined: Thu May 29, 2008 6:50 pm
Reputation: 3

Unread postAuthor: spudkilla224 » Sun Oct 25, 2009 6:27 pm

Ok thanks for all of the info and help everyone! :idea:
  • 0


spudkilla224
Corporal
Corporal
 
Posts: 65
Joined: Wed Mar 19, 2008 8:04 pm
Reputation: 0

Return to Hybrid Cannon Discussion

Who is online

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

Reputation System ©'