Search found 7 matches

by Rumpler
Sat Feb 20, 2021 2:33 am
Forum: Hybrid Cannons
Topic: Mechanical detention valve for high mix hybrid
Replies: 9
Views: 2202

Re: Mechanical detention valve for high mix hybrid

Ahhh, right to the next sore point :D I have a little 3mm PA plate (will replace it with rubber) where the angled plate hits the end of the casing, you can see it in the second picture of this post: https://www.spudfiles.com/viewtopic.php?p=389404#p389404 But right, that bolt builds up a lot of kine...
by Rumpler
Fri Feb 19, 2021 1:31 pm
Forum: BB, Airsoft, and Pellet Guns
Topic: co2 tank to fill with air
Replies: 7
Views: 1417

Re: co2 tank to fill with air

CO2 tanks have a nominal pressure of about 58bar at 20°C, that's why all those paintball air regulators reduce the pressure from whatever is in the bottle to that level (850psi) so air and co2 is interchangeable. About the max. working pressure, looking at the steel tank I have here I think the mark...
by Rumpler
Fri Feb 19, 2021 1:07 pm
Forum: Hybrid Cannons
Topic: Mechanical detention valve for high mix hybrid
Replies: 9
Views: 2202

Re: Mechanical detention valve for high mix hybrid

Hi, well, so much for "Keep It Simple". :roll: What was 2 parts - bolt and stem - is now made of 7 parts: stem, angled plate, bolt (only shown assembled), front bolt (reworked .357 casing), insert, washer and screw. I turned off the rim and recessed the base of the brass casing, so there is a 0.3mm ...
by Rumpler
Mon Feb 15, 2021 1:41 pm
Forum: Hybrid Cannons
Topic: Mechanical detention valve for high mix hybrid
Replies: 9
Views: 2202

Re: Mechanical detention valve for high mix hybrid

Having the o-ring go past the transfer port in high performance applications is not really a good idea. Well, you were right. :roll: Did work perfectly at the first try on the PCP air pump, everything sealed fine, popped open nicely at about 30bar - and sheared the top of the O-ring clean off. Seem...
by Rumpler
Sat Feb 06, 2021 11:45 am
Forum: Hybrid Cannons
Topic: Breech System For historical Pak 36
Replies: 26
Views: 3673

Re: Breech System For historical Pak 36

I used to fill my first hybrid by injecting the fuel into the bicycle pump (suction hole on top) with a big syringe while drawing the handle up, and continued to fill plain air to the desired pressure.

You'll need to seal that .22 if there is any pressure in the shell.
by Rumpler
Tue Feb 02, 2021 5:52 am
Forum: Hybrid Cannons
Topic: Mechanical detention valve for high mix hybrid
Replies: 9
Views: 2202

Re: Mechanical detention valve for high mix hybrid

Hi, when the O-Ring leaves his seat, and for the whole travel past the transfer port, the valve is still almost completly closed, not sealed hermetically but it's a pretty tight fit, less than 0.05mm. That's why I hope that the O-ring stays put, there should be no considerable airflow as long as it'...
by Rumpler
Sun Jan 31, 2021 12:46 pm
Forum: Hybrid Cannons
Topic: Mechanical detention valve for high mix hybrid
Replies: 9
Views: 2202

Mechanical detention valve for high mix hybrid

Greetings, fellow tinkerers :) after finishing my first Corona project - a 12mm, 140J PCP operated with a paintball tank (I'll post more about that, I promise) I'm tinkering on a hybrid again. My first try 10 years ago was a rather normal 14mm, 6x piston hybrid, but I had problems with the valve sea...