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Contests, Give aways and more. / Re: Win an FX Radar Chronograph
« Last post by sixshootertexan on January 18, 2020, 10:16:41 PM »
140.31
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Break Barrel, Pumper and Springer Airguns / Re: My Benjamin 392
« Last post by rsterne on January 18, 2020, 08:05:03 PM »
I started working on the new valve front end today to convert to a 2-piece valve.... The body for the front end is made from scratch, turned from a piece of 6061-T6 aluminum.... The space between the O-rings is 1/2", to give room for the gauge port and the two low-profile 8-32 high tensile screws.... They are set down on spot faces on the valve, so that the head will be supported by the brass tube.... I made the check valve from a piece of 1/4" Teflon rod with a light spring.... The valve spring is the Conical spring I use inside an MRod valve.... In order to provide a spring seat for both, I made a thin stepped washer, and it is supported in a column high enough to provide about 3/8" preload on the valve spring.... I can shorten the column if that is too much.... The tublular column only has a 1/32" wall so that it doesn't take up much volume inside the valve....



The seat for the check valve is an 8-32 setscrew, threaded into the front of the valve so that the cup point just protrudes into the check valve hole.... It is drilled though with a 3/64" drill to minimize head space, glued in with Loctite 638, baked to cure it, and then machined off flush with the flat front on the valve....



I still have to drill the holes in the tube for the mounting screws and then I can check for leaks before I do the final machining on the back of the valve to shorten it just in front of the seat.... I also have to make a new flat faced piston for the pump....

Bob
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Contests, Give aways and more. / Re: Win an FX Radar Chronograph
« Last post by steveoh on January 18, 2020, 04:27:07 PM »
Win an FX Radar Chronograph!

About the FX Radar Chronograph:

FX Radar Pocket Chronograph Features
* Uses Doppler Radar to obtain velocity, energy and other stats
* Controlled via Android/iOS smartphone app
* Bluetooth compatible
* Runs off three AAA batteries
* Allows user to input variables like pellet weight and radar return
* Measures velocity of Pellets / BB’s / Airsoft / Archery / Paintball

Using the first ever pocket radar ballistic chronograph from FX Airguns of Sweden, this
ballistic app enables the recording of data from 20 fps to 1100 fps.
Ever wanted to know the speed of your pellet, BB, Arrow or Paintballs, then this app will
allow you to create profiles and store data from all your testing and tuning.
Vocal shout outs for each shot can enable smooth target grouping at the range, just listen to
the result and don’t take your eye off the target.

Export the data strings for further evaluation, save and record your days testing using the
profile function.

It’s easy to check your power, take the FX Chronograph out of your pocket, start Bluetooth
and start the app on your phone.

Now you can check your power while zeroing and shooting groups.

Features Include:
- Realtime record of shots
- Clear display of shot strings
- Audio shout out’s, switchable OFF and ON **
- Profile Creation – Remember settings for easy recall
- Easy to select velocity ranges
- Scope Bore Height input (for future development)
- Input of Pellet data for profiles
- Multiple Unit Read Outs – FPS / MPS / FT Lbs / Joules / KMPH
- Radar Return adjustment for sensitivity
- Shot Count Data exportable to clipboard

Developments for future versions will be available and registration within the app is
suggested to enable update notifications.
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PCP, C02, and Helium Powered Airguns / Re: New FX Impact w/Power Plenum
« Last post by Alan on January 18, 2020, 01:57:48 PM »
Yesterday, I managed to take care of two squirrels. For those in the know, the New Mexico G&F rules for private land owners, are a bit different than those for public land. You have a right to protect your crop, and we're talking pecan orchard here. Okay?

One of the shots was very close—20 yards maybe? The extra velocity (≈950 FPS) caused the impact of the pellet, shall we say, loud! The second shoot was a guesstimate, based on the extension of the reticle and focus—about 90 yards. Must have been close enough, because the squirrel dropped like a stone. This brings up another important point.

I replaced the stock suppressor, if you could call it that, with DonnyFL's Ronin model. This fact changed the barrel vibration frequency, and the 100 yard groups weren't all that good. The solution was to "increase' the velocity to about 950 average (of all things?). As a result, the groups became "very" tight, at about 3/4 inch at 75 yard. I have some astigmatism in my right eye, which makes visually leveling the scope a bit iffy. I ordered a new, rather expensive level, which fits nicely on the picatinny rail under the rear of the scope. I'm sure this will "fix" the astigmatism issue.

So far, I am highly impressed. With the replacement suppressor, as it is very quiet. Even the sheep, which are typically a bit skittish, don't seem to mind the muzzle blast. That is, if you can call it a blast!

More later!
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Contests, Give aways and more. / Re: Win an FX Radar Chronograph
« Last post by rsterne on January 18, 2020, 11:47:52 AM »
Win an FX Radar Chronograph!

You have been reading Bob Sterne’s articles, particularly those at Hard Air Magazine, and now you want to put that information to use....  You want to build your own custom PCP, and need to figure out some important details....  Your goal is to end up with a regulated PCP, fed by an onboard 500 cc bottle that is filled to 300 bar....  You want a .257 cal that shoots 70 gr. slugs at 950 fps, from a 24” barrel....  You need the answers to the following questions (all answers to be in whole numbers, no decimals)….

1.  What is the FPE at the muzzle for the intended goal?....

2.  To achieve 90% of Bob’s “lofty goal” FPE calculation, what setpoint pressure (in psi) do you need for the regulator?....

3.  What is the plenum size (in cc) that Bob would recommend?....

4.  If you achieve an efficiency of 1.00 FPE/CI, how many shots should you get before the pressure falls below the setpoint?....

The first person to post the correct answers (by time and date stamp) to ALL of the above questions in this thread will win the FX Radar Chronograph from the AirGunGuild!....  If nobody posts all the correct answers by Feb. 1st, I will decide an alternate method to determine the winner.... My decision is final....  ;) 

Bob
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Contests, Give aways and more. / Win an FX Radar Chronograph
« Last post by Alan on January 18, 2020, 11:32:18 AM »
We all know of Bob Sterne, and his contributions to the airgun hobby. His depth of knowledge of the science behind airguns, is in fact, legendary! Based on this, the staff of the AirGunGuild (Bob is a member of the staff), decided to challenge the membership about their depth of knowledge of that science. Therefore, in the next day or so, Bob will post his challenge questions. Since the answers aren’t simply yes/no, we’ll give the membership until February 1st., to post their answers. Bob alone will decide who the winner is, and rightly so. Whomever that winner is, will win an FX Radar Chronograph, as supplied by Utah Airguns.

Good Luck to all!
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PCP, C02, and Helium Powered Airguns / Re: New FX Impact w/Power Plenum
« Last post by mcoulter on January 18, 2020, 11:21:31 AM »
Wow!  Congrats on an outstanding choice!  Like others have said, I can't wait to hear more about your experience with it!
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General Airgun Forum Discussion / Re: interesting target - backstop solutions
« Last post by steveoh on January 18, 2020, 08:45:14 AM »
I have three duct seal pellet traps. They are awesome for even the Sumatra fling JSB Heavies, as long as you have three layers of duct seal. The stuff gets hard in the winter and soft in the summer and boy do those traps increasingly get heavy. And yup if you shoot in the same spot you will end up getting a perfect tunnel that eventually will pass all the way through. Big bores will just break the whole thing. Ask me how I know.

I built a box completely framed in 2x wood, and it’s double walled, and filled with rubber mulch. It weighs way too much, but it sits at the top of the hill and currently is the rat’s favorite peanut butter station. I probably need a rat doc come by and check their obesity index as these rats are fat.

My favorite pellet and bullet trap these days is a five gallon Home Depot bucket filled with Lowe’s Rubber mulch, fitted with the normal snap on lid. I pack the mulch tight. It’s easy to pick up and move, cheap to buy, and when the lid wears out just get a new one.

The bucket will not handle the .458 or .58 DAQs for long but if you shoot straight on and shake the mulch back into shape every 5-10 shots you’ll get rid of the tunnel and the bucket will last longer. I use stick on and staple reinforced orange targets mounted to the lid. Gotta be color coordinated dontcha know.

Oh I tried melted candle wax filled traps that worked ok for weak airguns, but were completely destroyed by the big bores. Fun though.

I like to retrieve pellets and bullets and melt them down. The duct seal is miserable for retrieving lead. The mulch is awesome as you can add bits of mulch from your trap to another container filled with water, and find the rubber mulch floats and the lead sinks. Easy peasy to separate!

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General Airgun Forum Discussion / Re: interesting target - backstop solutions
« Last post by Insanity on January 18, 2020, 07:20:05 AM »
I use a 10 gallon tote to hold my mulch I can put a large 12" target on it. I cut a hole in the lid and back it with cardboard under the lid, then another sheet of cardboard to hold the target.
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General Airgun Forum Discussion / Re: interesting target - backstop solutions
« Last post by d_boom on January 18, 2020, 07:13:35 AM »
My first pellet trap was a wood box about 3-1/2" deep filled with Duct Seal a non-Harding product from Gardner Bender.
Duct Seal has been called ballistic putty, will stop pellets, but if several high energy shots are fired at the same point,
a hole will form allowing additional pellets to penetrate the trap.  Happened shooting my Airforce .22.  Maintenance of
the Duct Seal is required; removal of pellets, pellets form lead clumps, and filling in holes before the back is penetrated. 

Rubber mulch filled trap is a better solution.  The cardboard I use to hold mulch requires replacement, would like to use
something besides cardboard, any ideas? 

A group of us airgun shooters gather weekly shooting into traps filled with playground rubber mulch.  After a year pellet lead
was recovered yielding over 80 pounds of lead!
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