Search found 7 matches

by Jim Beam
Tue Oct 12, 2010 11:05 am
Forum: Miniature Guns
Topic: Is this a mini?
Replies: 12
Views: 2613

Ragnarok wrote:
Jim Beam wrote:
For the appropriate mix, you inject 4.2% propane by volume - as calculated by 1 molecule of propane to 5 of oxygen, and 21% oxygen content in air.
OH MY GOD ! !

you mean I've been WASTING 1.8% of each 10 cc volume charge on my pistol ?! Oh, the tragedy!
by Jim Beam
Sat Oct 09, 2010 7:31 pm
Forum: Miniature Guns
Topic: Is this a mini?
Replies: 12
Views: 2613

well it's actually a syringe used in a doctors office to clean out peoples ears! But it slides easy and has graduation marks so I know how much gas I'm using. I plug it in to the gas bottle. When I open the valve slowly the bottle pressure will move the plunger back. I calculated the chamber volume ...
by Jim Beam
Sat Oct 09, 2010 6:04 pm
Forum: Miniature Guns
Topic: Is this a mini?
Replies: 12
Views: 2613

Is this a mini?

Probably to big to qualify, but I thought I would share anyway. I built this so I would have something to shoot the leftover potato rings when I'm shooting my jumbo spray-n-pray cannon. I used roughly the same proportions as my big cannon. The barrel is 1/2" dia. and 21" long. The chamber is a PVC t...
by Jim Beam
Sat Jul 24, 2010 8:21 am
Forum: Miniature Guns
Topic: where do I get a gas syringe?
Replies: 18
Views: 5236

Re: where do I get a gas syringe?

Thanks everybody, my GF got me a nice one from the Drs office where she works.
by Jim Beam
Fri Jul 23, 2010 1:50 pm
Forum: Miniature Guns
Topic: where do I get a gas syringe?
Replies: 18
Views: 5236

Gun Freak wrote:dude just pull the plunger back yourself to the right volume then inject the gas... :tongue3:
You don't get it, this thing is hard to move even with 2 hands. I need a syringe that has an easy-sliding plunger.
by Jim Beam
Fri Jul 23, 2010 1:44 pm
Forum: Miniature Guns
Topic: where do I get a gas syringe?
Replies: 18
Views: 5236

where do I get a gas syringe?

I found some plastic syringes but there is way too much friction on the plunger for the gas bottle to move it.

What are you guys using to measure and inject very small volumes of gas?

thx
by Jim Beam
Thu Jul 22, 2010 8:13 pm
Forum: Combustion Cannons
Topic: What is this newbie doing wrong?
Replies: 3
Views: 579

What is this newbie doing wrong?

Hi all: Sorry if this question has been posted before. I used the search function but didn't see what I needed. I've been having great fun for the past year with my first spray-n-pray cannon, it's very easy to get the right fuel/air mix (16"L x 4" dia. combustion chamber, 44"L, 1.5" dia. barrel). So...