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Double Rifles, Single Shots & Combinations >> Building Double Rifles & Gunsmithing

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PCP
.224 member

Reged: 17/07/08
Posts: 6
Loc: Europe

Double air rifle
#251816 - 09/08/14 07:29 PM

Hello,
I've been a member for a while but haven't posted until now.
I want to show you my long time project, double air rifle I have been building since 2008.
It all started with CAD design.

Parts machining

Machining and soldering the barrels.

Barrels cleaned up and fitted to action.

Slowly coming together.

Forend and stock work.

And that's it so far. I hope it isn't inappropriate to post this here, it really isn't a nitro express, but should be good to stop a charging bunny.

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dons
.333 member

Reged: 18/08/07
Posts: 431
Loc: Essex

Re: Double air rifle [Re: PCP]
#251817 - 09/08/14 07:56 PM

What a fascinating project, never saw anything like it. Beautiful workmanship. Congrats on a job well done.

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DarylS
.700 member

Reged: 10/08/05
Posts: 26998
Loc: Beautiful British Columbia, Ca...

Re: Double air rifle [Re: dons]
#251818 - 09/08/14 08:21 PM

Fascinating project is right!
Beautiful little rifle!

The reservoir must be inside the butt and is filled through the butt plate?

How many shots to a fill at what speed?

--------------------
Daryl

"a gun without hammers is like a Spaniel without ears" King George V

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ChrisPer
.300 member

Reged: 12/05/08
Posts: 235
Loc: Australia

Re: Double air rifle [Re: DarylS]
#251820 - 09/08/14 08:47 PM

Wow!Thanks for showing us.

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tinker
.416 member

Reged: 12/03/05
Posts: 4835
Loc: Nevada

Re: Double air rifle [Re: ChrisPer]
#251821 - 09/08/14 08:51 PM

Very cool.

I can't wait to see more.

Cheers and Welcome
Tinker

--------------------
--Self-Appointed Colonel, DRSS--

"It IS a dangerous game, and so named for a reason, and you can't play from the keyboard. " --Some Old Texan...

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Waidmannsheil
.400 member

Reged: 19/04/13
Posts: 2443
Loc: Melbourne Australia

Re: Double air rifle [Re: tinker]
#251824 - 09/08/14 10:13 PM

Amazing Engineering and superb machining. Something very different, it would have to be the only one in the world. Did you do all the work yourself or did you have a machine shop do it for you.
Fantastic.

Waidmannsheil.

--------------------
There is nothing wrong with vegetarian food, so long as there is meat with it.

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Waidmannsheil
.400 member

Reged: 19/04/13
Posts: 2443
Loc: Melbourne Australia

Re: Double air rifle [Re: Waidmannsheil]
#251825 - 09/08/14 10:18 PM

Have the sear and main springs been wire cut. If so what grade of spring steel did you use and which way did you orientate the grain.

Waidmannsheil.

--------------------
There is nothing wrong with vegetarian food, so long as there is meat with it.

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Waidmannsheil
.400 member

Reged: 19/04/13
Posts: 2443
Loc: Melbourne Australia

Re: Double air rifle [Re: Waidmannsheil]
#251828 - 09/08/14 10:25 PM

What part of Europe are you in.

Waidmannsheil.

--------------------
There is nothing wrong with vegetarian food, so long as there is meat with it.

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PCP
.224 member

Reged: 17/07/08
Posts: 6
Loc: Europe

Re: Double air rifle [Re: DarylS]
#251830 - 09/08/14 11:09 PM

Quote:

Fascinating project is right!
Beautiful little rifle!

The reservoir must be inside the butt and is filled through the butt plate?

How many shots to a fill at what speed?

Yes, the reservoir is inside the butt and filled through the butt plate.
I have no idea how many shots, power will be around 20J (15fpe), as this is the power limit we have here.

Waidmannsheil,
Yes, I did all the machining myself. Sears are made from OCR12WM steel, and mainsprings from the old car leaf spring. They were not wire cut, but heated and bent and filed to shape and then heat treated.

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Ash
.400 member

Reged: 10/05/11
Posts: 1653
Loc: Australia

Re: Double air rifle [Re: PCP]
#251831 - 09/08/14 11:19 PM

Goodness me! Now this is cool!

Can't wait to see how it shoots, when its finished. The ultimate in sparrow control

(and rabbit)

--------------------
.

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Huvius
.416 member

Reged: 04/11/07
Posts: 3556
Loc: Colorado

Re: Double air rifle [Re: PCP]
#251832 - 09/08/14 11:25 PM

Amazing! You are a true talent!
Please keep us up to date on the final stages.

I am sure that I am not the only one here thinking... "big bore double air rifle, mmmmmm"
Do you have any limitations where you live regarding bore size or projectile weight?

--------------------
He who lives in the past is doomed to enjoy it.

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Waidmannsheil
.400 member

Reged: 19/04/13
Posts: 2443
Loc: Melbourne Australia

Re: Double air rifle [Re: Huvius]
#251836 - 09/08/14 11:46 PM

I am afraid I have to say it again. Great work. Very impressive.

Waidmannsheil.

--------------------
There is nothing wrong with vegetarian food, so long as there is meat with it.

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Metalguy
.300 member

Reged: 25/10/09
Posts: 152
Loc: Northern WY

Re: Double air rifle [Re: Waidmannsheil]
#251838 - 10/08/14 12:40 AM

Simply amazing! Great job!

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DarylS
.700 member

Reged: 10/08/05
Posts: 26998
Loc: Beautiful British Columbia, Ca...

Re: Double air rifle [Re: Metalguy]
#251839 - 10/08/14 01:35 AM

15fpe - I have not seen mention of cailbre - ie: 4.5mm or 5.5mm?

Normal pellet in .22 (5.5) will run 620fps to 660fps depending on pellet weight. Pellets above 18gr. will have to be moving even slower.

In .177, over 850 to 900fps will work at that power limit depending on pellet weight. 900fps (14.75fpe) makes for a really flat trajectory over 60yards with an 8.2gr. pellet.

--------------------
Daryl

"a gun without hammers is like a Spaniel without ears" King George V

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PCP
.224 member

Reged: 17/07/08
Posts: 6
Loc: Europe

Re: Double air rifle [Re: DarylS]
#251844 - 10/08/14 03:17 AM

It is .22 caliber. We a are also limited with velocity, max 200 meters per second, so .22 is the best choice to come close to both limits.

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Matabele
.300 member

Reged: 16/09/10
Posts: 230
Loc: Zimbabwe

Re: Double air rifle [Re: PCP]
#251851 - 10/08/14 06:02 AM

Astounding and brilliant!! Just superb.

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DarylS
.700 member

Reged: 10/08/05
Posts: 26998
Loc: Beautiful British Columbia, Ca...

Re: Double air rifle [Re: PCP]
#251852 - 10/08/14 06:55 AM

Quote:

It is .22 caliber. We a are also limited with velocity, max 200 meters per second, so .22 is the best choice to come close to both limits.

YES - perfect for 18 to 19gr. pellets.

How many shots do you expect from a fill - 200, 250, or 300Bar? 200 Bar = 2,900psi and 300 Bar, which would be good for more shots = 4,350psi.

Will you carry a carbon fiber 4,500psi tank with you in a back or hip pack while hunting?

--------------------
Daryl

"a gun without hammers is like a Spaniel without ears" King George V

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Iowa_303s
.400 member

Reged: 22/03/13
Posts: 1016
Loc: Iowa, USA

Re: Double air rifle [Re: DarylS]
#251853 - 10/08/14 06:58 AM

Simply amazing! Great job!
I can't wait to see the final result and test targets.
What range do you plan to zero it at?

--------------------
Matt

formerly known as Iowa_303

"Once your reputation is ruined you can live your life quite freely."

"Enkelkinder über alles"

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eagle27
.400 member

Reged: 24/01/09
Posts: 1165
Loc: Rolleston, Christchurch, New Z...

Re: Double air rifle [Re: Iowa_303s]
#251857 - 10/08/14 07:21 AM

Wow, now we will be able to go on a mouse safari and safely take on those charging critters.

I have been fortunate to visit that famous Austrian town of Ferlach and saw some amazing gunmaking work there but I just can't believe what I'm seeing here. What a superb example of old style gunmaking. Your attention to detail is extraordinary. Can't wait to see the finished product and here all about your regulation trials etc. Well done.

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DarylS
.700 member

Reged: 10/08/05
Posts: 26998
Loc: Beautiful British Columbia, Ca...

Re: Double air rifle [Re: eagle27]
#251859 - 10/08/14 07:54 AM

I've a feeling, the regulation might be s simple as aligning the bores with lasers, soldering them and that's it. With only compressed air and 620fps to 670fps with 15gr. to 17gr. pellets, I don't think PCP will have regulation problems, but - you never know until you do it.

Judging by what we've see so far, I don't think regulation will be any problem anyway.

--------------------
Daryl

"a gun without hammers is like a Spaniel without ears" King George V

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bwanabobftw
.375 member

Reged: 29/12/04
Posts: 675
Loc: Texas

Re: Double air rifle [Re: DarylS]
#251871 - 10/08/14 03:02 PM

WOW !!!!!!! That is just perfect .
Well done.

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PCP
.224 member

Reged: 17/07/08
Posts: 6
Loc: Europe

Re: Double air rifle [Re: bwanabobftw]
#251873 - 10/08/14 05:17 PM

Thank you very much for your kind words,i really appreciate it.
Rifle will be filled to 200 bar and I think it should give around 30 consistent shots at this power level. It will have three leaf sights, one fixed and two folding, zeroed maybe at 15,30 and 50 meters, I haven't decided yet.
I never did regulation before, so will see how it goes, but I think it would be easier than with cartridge firing rifles, a lot less forces at work here.

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Birdhunter50
.375 member

Reged: 03/06/07
Posts: 815
Loc: Iowa,U.S.A.

Re: Double air rifle [Re: PCP]
#251881 - 10/08/14 11:29 PM

Very Cool project gun! Keep up the good work and let us know how it turns out. From your pictures so far, I can tell that you are a very excellent craftsman. Bob

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Shotgunlover
.224 member

Reged: 24/08/13
Posts: 45
Loc: Greece

Re: Double air rifle [Re: PCP]
#251882 - 10/08/14 11:32 PM

Ingenuous exploitation of both air rifle and DR design features.

The rebounding lock will avoid the old valve bouncing problem and prove to some that the rebounding lock can prevent valve bounce.

The firing pins presumably act as individual valve actuators, which is a brilliant adaptation of DR design to the air rifle.

My only misgiving is the need for the oversized mid rib. But then, I am judging from photos, from close up it might be just the ticket.

Now, if you can find the time to write about the design and machining stages you will make a lot of us very happy.

Above all else though, it is also a very pretty double rifle. One of the most elegant I have seen.

Congratulations!

--------------------
Shotgunlover

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DarylS
.700 member

Reged: 10/08/05
Posts: 26998
Loc: Beautiful British Columbia, Ca...

Re: Double air rifle [Re: Shotgunlover]
#251885 - 11/08/14 12:32 AM

With low sights, those zeros might work just fine, or perhaps 20, 35 and 45? Something to think about along with everything else. The drop can get excessive in .22 compared to the same fpe level in .177.

I think you are doing an amazing job. 30 shots per fill would be wonderful. Will it have a regulator?

--------------------
Daryl

"a gun without hammers is like a Spaniel without ears" King George V

Post Extras:

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