0.22" mini piston hybrid
It just means a piston that when opened, shows significantly more surface area than when closed, resulting in the piston opening faster once slightly opened.
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its a piston with a big part and a small part, you only need a little bit to get it to move but once it start it open up tonnes more surface area and makes the piston really POP open. you can see it in jsr drawing above look how little the pressure can act on at the start.
edit to late
edit to late
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Ok thanks, makes sense.
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- jackssmirkingrevenge
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For the sake of clarity:
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hectmarr wrote:You have to make many weapons, because this field is long and short life
- jackssmirkingrevenge
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Thinking of giving this another go, now that I have more experience with materials and machining. The delrin/metal face seal is quite common in the commercial PCP airgun field, the question is how well it can stand up to the heat spike from hybrid ignition.
This would naturally be filled by placing the cartridge inside a filling chamber.
This would naturally be filled by placing the cartridge inside a filling chamber.
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hectmarr wrote:You have to make many weapons, because this field is long and short life
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Looks good!
How are you going to force th piston forward? pneumatical or with a spring?
How are you going to force th piston forward? pneumatical or with a spring?
Piston goes backward with the pressure spike of the mix igniting.How are you going to force th piston forward? pneumatical or with a spring?
Shame i don't use my hybrid much anymore, too much fuss cutting out stupid burst disks, might have to try a piston hybrid.
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Delrin is so nice to machine compared to some of the other plastics.Moonbogg wrote:Looks like a fun project. I also wonder how the delrin would do. So many plastics to choose from for piston material.
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I know, but how is it held against the barrel?Piston goes backward with the pressure spike of the mix igniting.
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No springs, just the pre ignition pressure. The idea is that it is placed in a fill rig as attached, fuel is injected and the rig is sealed. The rig is taken up to pressure, then the schrader stem is depressed, causing a pressure imbalance which should force the piston shut.Labtecpower wrote:How are you going to force th piston forward? pneumatical or with a spring?
So true, it's become my favourite polymer and quite cheap too!dewey-1 wrote:Delrin is so nice to machine compared to some of the other plastics.
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hectmarr wrote:You have to make many weapons, because this field is long and short life
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This would be just to fill the cartridges at pressures below 400 psi, so it doesn't to be neat or overengineered.dewey-1 wrote:Use 2 set screws rather than an exposed headed screw!
hectmarr wrote:You have to make many weapons, because this field is long and short life
My apologies then!jackssmirkingrevenge wrote:This would be just to fill the cartridges at pressures below 400 psi, so it doesn't to be neat or overengineered.dewey-1 wrote:Use 2 set screws rather than an exposed headed screw!
I did not realize that was the filling rig.
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Why would this work?JSR wrote:No springs, just the pre ignition pressure. The idea is that it is placed in a fill rig as attached, fuel is injected and the rig is sealed. The rig is taken up to pressure, then the schrader stem is depressed, causing a pressure imbalance which should force the piston shut.
If you inject the mix, it will push back the piston.
Why would there go enough mix behind the piston to force it shut when you depress the schrader?
I think it would slam against the back plug while filling, removing the air behind it.