GTA
All Springer/NP/PCP Air Gun Discussion General => Machine Shop Talk & AG Parts Machining => Engineering- Research & Development => Topic started by: GumpIsrael on August 14, 2016, 11:56:21 PM
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I really like designing one-off guns. I don't have the tools or funds to produce any of my creations, but I like the challenge of designing in and of itself.
Anyways, I was wondering if anyone had ever made a gun using the three most popular powerplant systems?
I've seen the eskopeta combination air rifle from the Philippines and was inspired to start designing a gun that used co2/hpa, mpp, and springpiston as sources of power. Alternately of course, not in conjunction with one another. However I do see a possibility in that as well.
This does sound a bit complicated to me, but i'm up for a challenge. The gun and barrel assembly is the most perplexing part that i've had to think about. The main body would almost certainly have to be where the spring/gas piston powerplant is located. Break-barrel is feasible and so is side lever.
Like I said, these are just the ramblings of a wannabe mad scientist.
Any thoughts are welcome, i'll probably have some pictures of a design within the next two weeks.
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A side or bottom lever would probably work better than a break barrel, if you're thinking of fixing it so as to work PCP as well as spring power. some kind of cartridge system that would allow the "guts" to be removed in order to replace with the other power plant might be a good idea. Incorporating a spring powered system into the mix is what will give you fits. The trigger system for a spring system is vastly different from that which is used in PCP's and such.
"Can it be done?"
I'm waiting here to see what you come up with. :D
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I had thought about a modular powerplant system, but decided against it in favor of a redundancy system that contains all three powerplants. This is where my challenge really is.
For me, the triggering system is one of the more easy to solve parts: linkages or cables. The only question in that department is how to make the pull easier if not the same for all three systems.
The pump and co2/hpa system will most likely be mounted on the side or top as I am really starting to lean towards a breakbarrel design. The real challenge is finding a good point to converge the separate systems, I have several ideas so far, but nothing that works 100%.
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well the combo Hpa and pumper has been done by rsterne, then daisy made the one model that took co2 12 grams and pumped. So all three would be easy , a foster connection into a chamber to leads to a valve but is blocked off by a ball valve. once blocked its a pumper.Now how the heck to make it a springer also is the fun part.my notion would be a " union block"... this woould be the in the area in which u tradionally load a pellet in a beartrap springer. A microbore feeds into this union from the co2/hpa pumper side.the sidelever would have to disengage to serve as a pumper, and again the co2 side would need a shutoff for use as a pumper. Not impossible.. as for the trigger, a springer trigger wil still fire a pumper, maybe not the other way around though
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So, at long last, I did come up with a design that would work. It wouldn't be the most accurate gun, but unique. It would be based on a side-lever tap-loader, and have a selector switch to transfer ports from pump/hpa/co2 just behind the tap.
the selector switch would have one side bored out and have an two openings, on that is straight, going back into the spring piston compression tube, the other would come in at an angle to the bore itself just behind the tap. The pumper/co2/hpa function would be mounted on the underside of the gun and use a separate trigger mounted forward on the gun... sort of like the M203 grenade launcher. the only problem I for see is a very low velocity when using the PCP/co2/pumper feature.
I will post some drawings when I finish them.
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im looking forward to this , I bet some manufacturers would be interested also.. daisy had a pumper/co2 combo back in the 80s
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It is by no means perfect, I've got a rough draft of the selector switch spring piston assembly drawn up. I make no claims to having engineered or thought about safety in a mathematical manner. I'm just an ideas guy, really, I hate math and calculations. guys like Bob (rsterne) do that kinda thing.
I'm gonna have to resize the pics tomorrow on my lunch break and then I'll be able to post them.
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reminds me of a car that can turn into a boat. the concept sounds good but you end up with and overly complex (usually means pricey) vehicle that doesn't really drive on road or water well.
it could be done but would be costly and clunky. there would be different trigger pull for spring powerplant and pre charged and most likely a different POI. which means you wouldn't really be able to just switch to spring power without resighting your scope. in which case you may as well just have a separate pcp/gaser and springger
fx independence is where its at all the advantages of pcp with the independance of a springger.
what i would like is a more portable hpa pump that could fit into a backpack
sorry if I sound like a negative Nancy just trying to keep things in perspective
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It's really just a concept and not too complex either. The only real difference between it and a regular taploader is there is the selector switch and a bottom mounted valve.
This is more about me having fun trying to design something than anything else lol.