Quote from: oldpro on December 18, 2018, 09:13:20 PMQuote from: skorec on December 18, 2018, 04:44:22 AMQuote from: Tucobenedicto on December 18, 2018, 02:47:13 AMThanks for sharing your work,but now my few neurons are trying to understand how it works,it use extra flow at wide poppett lift to increase valve spring closing force?+1When and why the new/added ball valve at cobra chamber unseal ? The ball and spring have two affects 1. it traps the HP air below the ball plunger and forces the valve closed rapidly 2. it provides a larger vent on the poppet upstroke so the valve opens easier than a cobra valve.I am thinking that first effect I found out also myself via your pictures of course ( see my previous post ). But the second effects (next eliminating of cracking force and soft HPA backstop for main popped spring ) is also veeeeeeeeery interesting. One chamber and one O-ring will reduce/half also sticker issue. Less cracking/opening striker force and quicker closing of valve is good way for improving it for sure. Still I am thinking that also appropriate parameters ( probably much less hammer weight and a little bit less spring force/preloading ) you have to write into installation manual. It will be also sooner than China producers start produce complete PCP whit these valve for 200USD. Personally I will be very happy if you send me some upgrade ( new brass tube whit entrails ) for my Kral SS balanced valve for 100USD.
Quote from: skorec on December 18, 2018, 04:44:22 AMQuote from: Tucobenedicto on December 18, 2018, 02:47:13 AMThanks for sharing your work,but now my few neurons are trying to understand how it works,it use extra flow at wide poppett lift to increase valve spring closing force?+1When and why the new/added ball valve at cobra chamber unseal ? The ball and spring have two affects 1. it traps the HP air below the ball plunger and forces the valve closed rapidly 2. it provides a larger vent on the poppet upstroke so the valve opens easier than a cobra valve.
Quote from: Tucobenedicto on December 18, 2018, 02:47:13 AMThanks for sharing your work,but now my few neurons are trying to understand how it works,it use extra flow at wide poppett lift to increase valve spring closing force?+1When and why the new/added ball valve at cobra chamber unseal ?
Thanks for sharing your work,but now my few neurons are trying to understand how it works,it use extra flow at wide poppett lift to increase valve spring closing force?
So is a Python a Cobra with a bung in the hole?....Bob
I get it Travis, it has a check valve (a bung) in the front (hole).... …. I was trying to be funny.... …. Guess that failed, big time.... Does the ball valve open on firing?.... or does it only open to refill the Python front chamber (air spring) between shots?.... and why?....Bob
The reason I am confused is that in the first photo, assuming the parts are in the correct order in the photo, the ball appears to be on the poppet side of its return spring.... Further down, it looks like the ball is on the front side of the return spring, and that the seat is in the front, where the jet is in the Cobra valve.... Which is it?.... If the ball is at the front (inlet) side of the chamber, then it would retain HPA in the chamber during the shot cycle, only allowing the air to top up the chamber between shots.... THAT I can see working, because it would maintain the pressure in the air spring, instead of letting it escape out through the tiny vent in the front of the Cobra valve.... It would be like having no vent during the shot, but having a vent between shots.... right?....If the ball is on the poppet (back) end of the chamber, like shown in the first photo, I haven't a clue what is going on.... Where would the ball seat?.... Bob
The arrangement looks promising but would rely completely on different spring rates wouldn’t it . One stiffer than the other allowing the chamber to refill . Makes perfect sense , I think I’ll stick with the cobra for now . What if you used a preload adjuster like a hammer spring adjustment . That would make it a bit easier to tune wouldn’t it . Not sure how to fit it in there .
Quote from: Hobbyman2007 on December 19, 2018, 06:03:30 PMThe arrangement looks promising but would rely completely on different spring rates wouldn’t it . One stiffer than the other allowing the chamber to refill . Makes perfect sense , I think I’ll stick with the cobra for now . What if you used a preload adjuster like a hammer spring adjustment . That would make it a bit easier to tune wouldn’t it . Not sure how to fit it in there . I dont think so, I think you want the spring as light as possible to allow the poppet to climb easily the rest is controlled by the HPA