My Finished Mini
Posted: Fri Jul 14, 2006 5:14 pm
After some goading, I have been convinced to post my new mini here.
It is a simple design, (despite appearances), that performs very well. Despite all of boogieman's theories on how tee chambers were detrimental to mini designs, this one works great! I had to make a smaller meter attachment to get the right mix, but that only set me back 13 bucks.
The chamber is 550 mL, and the barrel is 3/4" SCH-40 PVC 5' long. The ignition is provided by two lengths of #6 allthread tapped, (yes, actually tapped, not just screwed), into the bottom of the tee where the tee overlaps the 2" SCH-40 pipe connecting it to the bottom endcap.
The back of the launcher is a SCH-40 NSF-pw pressure rated female cap screwed onto a male adapter.
As with all my launchers, I use male auto couplings, (quick connects), for my metered propane. The Schrader valve is used to vent the chamber, and of course to fuel the launcher to a 1.2x mix.
The reason I used all of these pressure rated fittings and safe construction methods is so I could take it up to a 1.2x/1.2x atm mix. That's about the highest I'm willing to go, though. Any higher than that and I'd be classified as "crazy".
Here's some pictures...
And that's it! Feel free to comment.
It is a simple design, (despite appearances), that performs very well. Despite all of boogieman's theories on how tee chambers were detrimental to mini designs, this one works great! I had to make a smaller meter attachment to get the right mix, but that only set me back 13 bucks.
The chamber is 550 mL, and the barrel is 3/4" SCH-40 PVC 5' long. The ignition is provided by two lengths of #6 allthread tapped, (yes, actually tapped, not just screwed), into the bottom of the tee where the tee overlaps the 2" SCH-40 pipe connecting it to the bottom endcap.
The back of the launcher is a SCH-40 NSF-pw pressure rated female cap screwed onto a male adapter.
As with all my launchers, I use male auto couplings, (quick connects), for my metered propane. The Schrader valve is used to vent the chamber, and of course to fuel the launcher to a 1.2x mix.
The reason I used all of these pressure rated fittings and safe construction methods is so I could take it up to a 1.2x/1.2x atm mix. That's about the highest I'm willing to go, though. Any higher than that and I'd be classified as "crazy".
Here's some pictures...
- The full launcher...
- full.jpg (39.87 KiB) Viewed 1704 times
- Chamber detail...
- Breech loading detail...
- The meter attachment...
- Thank McMaster...
- schrader.jpg (12.75 KiB) Viewed 1704 times
- What a compression nut did to a Chek can...
- chek.jpg (27.31 KiB) Viewed 1704 times
They're actually cheaper at the feed store than the hardware store's DWV fittings. Heh heh...