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 45 users online :: 5 registered, 0 hidden and 40 guests


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

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

The Team
Administrators
Global Moderators
global_moderators.png CS

Newbie needs advice

A place to ask general spud cannon related questions.
Sponsored 
  • Author
    Message

Newbie needs advice

Unread postAuthor: sponge bob hunter » Tue Aug 07, 2012 4:51 am

I have two potato cannons made of ABS they have 14 to 16 inch combustion chambers with approximate 5 foot barrels they are ignited by scavenged BarBQ igniters and fueled with hair spray. I havve found first that neither work well (beyond a single shot) in a Canadian winter. I attribute this to condensation providing a connection between ground and sparker along the inner surface. I tried widening the gap a the entry point with little improvement. The real problem is with the smaller bore gun it is only good for a shot or two and often misfires although visually exhibiting a good spark. I am a Newbie with a primitive system by your standards after looking around but need advice. Sponge Bob
  • 0


sponge bob hunter
Private
Private
 
Posts: 1
Joined: Tue Aug 07, 2012 4:24 am
Reputation: 0

Unread postAuthor: mattyzip77 » Tue Aug 07, 2012 7:25 am

Your gap should be a 1/4 inch and you are probably using too much hair spray. Try a 2 to 3 second squirt of aqua net hair spray. Must be aerosol and not the pump kind. good luck..
  • 0

Go Bruins!!!!
User avatar
mattyzip77
Donating Member
Donating Member
 
Posts: 1249
Joined: Tue Jun 28, 2011 12:22 pm
Location: Taxachusetts
Reputation: 0

Unread postAuthor: jsefcik » Tue Aug 07, 2012 9:30 am

Trying Carb cleaner or propane measuring
  • 0


jsefcik
Brigadier General
Brigadier General
 
Posts: 1132
Joined: Tue Jun 07, 2011 10:11 am
Reputation: 0

Unread postAuthor: jimmy101 » Tue Aug 07, 2012 12:44 pm

Misfiring only after a successful shot suggests that your aren't adequately purging the combustion gases from the chamber between shots.

Also, at low temperatures fuel mixing is pretty slow. Add a chamber fan or simply wait a minute or two after fueling.

Metering will also help a lot.
  • 0

Image

jimmy101
Lieutenant General
Lieutenant General
 
Posts: 3129
Joined: Wed Mar 28, 2007 9:48 am
Location: Greenwood, Indiana
Country: United States (us)
Reputation: 7

Return to General Spud Cannon Related

Who is online

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

Reputation System ©'