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 73 users online :: 6 registered, 0 hidden and 67 guests


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

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

The Team
Administrators
Global Moderators
global_moderators.png CS

Propane problems

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

Unread postAuthor: Recoiled_monsteR » Wed Jul 18, 2012 9:46 pm

I used this idea in a combustion cannon. It does not have a ball valve. I have it rigged up with elastic bands to return it to the starting position. i would put pictures on but I cannot get them of my phone at the moment
  • 0


Recoiled_monsteR
Private
Private
 
Posts: 16
Joined: Fri Jul 06, 2012 10:28 am
Reputation: 0

Unread postAuthor: DYI » Thu Jul 19, 2012 6:27 am

You've ignored the question as to the meter volume you're using, thus making it impossible for us to help you any further.
  • 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: Recoiled_monsteR » Thu Jul 19, 2012 10:50 am

1/2" pipe, 3.5" long with a pressure of approx. 90PSI but it won't fire at that (what ultimatespud calc spit out) if I go down to like 25PSI it'll fire though.
  • 0


Recoiled_monsteR
Private
Private
 
Posts: 16
Joined: Fri Jul 06, 2012 10:28 am
Reputation: 0

Unread postAuthor: Recoiled_monsteR » Thu Jul 19, 2012 11:07 am

Image

Image

Image

Image

Image

Image

These are before the meter got put on. I just found the converter I needed to get pics off of my phone, I will try to get a exact measurement and pic of propane meter. I think the problem lies in the fuel not getting mixed properly.
  • 0


Recoiled_monsteR
Private
Private
 
Posts: 16
Joined: Fri Jul 06, 2012 10:28 am
Reputation: 0

Unread postAuthor: jackssmirkingrevenge » Thu Jul 19, 2012 12:09 pm

Going by those dimensions, looks like you want about 65 psi for an ideal mix.

Does your meter gauge read zero at atmospheric pressure? If so, for a purged meter you need about 50 psi.
  • 0

User avatar
jackssmirkingrevenge
Donating Member
Donating Member
 
Posts: 24225
Joined: Thu Mar 15, 2007 11:28 pm
Country: Holy See (Vatican City State) (va)
Reputation: 66

Unread postAuthor: Recoiled_monsteR » Thu Jul 19, 2012 12:14 pm

yes at atmospheric pressure it reads zero
  • 0


Recoiled_monsteR
Private
Private
 
Posts: 16
Joined: Fri Jul 06, 2012 10:28 am
Reputation: 0

Unread postAuthor: jackssmirkingrevenge » Thu Jul 19, 2012 12:20 pm

Can you describe your metering procedure in detail?

Alternatively, can you just buy a 50mL syringe and solve all your problems ;)
  • 0

User avatar
jackssmirkingrevenge
Donating Member
Donating Member
 
Posts: 24225
Joined: Thu Mar 15, 2007 11:28 pm
Country: Holy See (Vatican City State) (va)
Reputation: 66

Sponsored

Sponsor
 


Unread postAuthor: sgort87 » Thu Jul 19, 2012 12:57 pm

How well does your ram seal? It looks like a loose fit. You'll lose efficiency if it leaks.

As for the combustion issue, fan or no fan, you should be seeing better results. Most of the time it's too much fuel. Keep trying less fuel after proper ventilation each time.
  • 0

<a href="http://www.launchpotatoes.com"><img src="http://www.launchpotatoes.com/images/uploads/logo2.PNG"></a>
http://www.LaunchPotatoes.com
User avatar
sgort87
Donating Member
Donating Member
 
Posts: 1038
Joined: Sun Sep 18, 2005 10:32 am
Location: Lockport, Illinois
Country: United States (us)
Reputation: 1

Unread postAuthor: i-will » Tue Jul 24, 2012 2:46 pm

i had a simalar issue year ago when combustion was the addiction. try changing the barrel/chamber ratio. if the chamber is too big the barrel will act as as choke. some pics would help us diagnose this better.
  • 0

WHY PAY FOR IT WHEN U CAN MAKE IT?
User avatar
i-will
2nd Lieutenant
2nd Lieutenant
 
Posts: 245
Joined: Tue Jul 22, 2008 3:04 am
Reputation: 0

Previous

Return to Combustion Cannon Discussion

Who is online

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

Reputation System ©'