Author Topic: Inside an Air Javelin  (Read 2952 times))

Offline darkcharisma

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Re: Inside an Air Javelin
« Reply #20 on: March 28, 2020, 08:00:04 PM »
I just modded the last message. Darn it I ran out of bolts as I shot down to 10mpa.

So it did net me total of 50 shots in in the 13fps spread. From 20 to 10mpa. Speed spiked a bit before I blew the last bolt.

It was accurate though at 25 yards. I hit a quarter sized washer...
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Offline Rob M

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Re: Inside an Air Javelin
« Reply #21 on: March 28, 2020, 08:07:18 PM »
So the bolt failed on impact  or leaving the straw barrel ? I guess they're built to the limitation of co2
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Offline darkcharisma

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Re: Inside an Air Javelin
« Reply #22 on: March 28, 2020, 08:22:02 PM »
Some went through the thin archery target and shattered shaft. This last shaft I tried blew the target head off leaving only the shaft. I can see the epoxy stuff but I have no replacements. I may need to buy a bunch of shafts in the id/od required and make my own.
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Offline Rob M

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Re: Inside an Air Javelin
« Reply #23 on: March 28, 2020, 08:25:32 PM »
Some went through the thin archery target and shattered shaft. This last shaft I tried blew the target head off leaving only the shaft. I can see the epoxy stuff but I have no replacements. I may need to buy a bunch of shafts in the id/od required and make my own.

good call.. some aluminum shafts with threaded heads
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Offline tkerrigan

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Re: Inside an Air Javelin
« Reply #24 on: March 28, 2020, 08:53:51 PM »
At regulated 850-1100psi or so on air it should do better than CO2.  Thinner gas, moves more quickly.  Regards, Tom
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Offline tkerrigan

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Re: Inside an Air Javelin
« Reply #25 on: April 03, 2020, 12:47:34 AM »
Back on the 250fps or so arrow speed, you are pushing hard and seating the arrow over the o-ring at the base of the barrel? I imagine you are but just checking.  Haven't heard anybody mention it.  Regards, Tom
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Offline darkcharisma

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Re: Inside an Air Javelin
« Reply #26 on: April 03, 2020, 02:30:55 AM »
Yes i tried both ways. Seating it hard by the orings and free floating without the oring. Same fps.

This not worthy, i need to have more arrows...
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Offline darkcharisma

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Re: Inside an Air Javelin
« Reply #27 on: April 15, 2020, 01:00:17 AM »
i managed to salvaged one bolt. and i was able to hit 325fps with the oem bolt at 6mpa or 870psi. its 220fps above that pressure.  also found out regular bolts will work just fine, just a bit heavier.


« Last Edit: April 15, 2020, 01:23:49 AM by darkcharisma »
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Offline Rob M

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Re: Inside an Air Javelin
« Reply #28 on: April 15, 2020, 08:41:05 AM »
thats a really good gain ! awesome
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Offline grand-galop

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Re: Inside an Air Javelin
« Reply #29 on: July 06, 2020, 12:36:41 AM »
Any update on your setup ??? ::)
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Offline darkcharisma

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Re: Inside an Air Javelin
« Reply #30 on: July 06, 2020, 01:18:07 AM »
Yes I bought a bunch of aluminum and carbon bolts. I haven't had the chance to touch it again due to other projects. I didn't even bought stronger springs or make the hammer heavier. i'll get around to it but it's going to be a while.
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Offline grand-galop

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Re: Inside an Air Javelin
« Reply #31 on: July 11, 2020, 09:53:42 AM »
Thanks for the precision .. That is interesting to see developments to this platform..
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Offline Kidpellet

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Re: Inside an Air Javelin
« Reply #32 on: October 29, 2020, 04:58:30 PM »
I made an adapter to use the regulated bottle off one of my Gauntlets. So far so good. Also drilled and tapped an old 90 gram co2 for a fill port so it can be refilled
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Offline Kidpellet

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Re: Inside an Air Javelin
« Reply #33 on: October 29, 2020, 05:06:37 PM »
Been working ok. Posted some videos to my Air Javelin FB group
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Offline Rob M

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Re: Inside an Air Javelin
« Reply #34 on: October 29, 2020, 05:39:23 PM »
looks good , you running the stock 1100 pisi reg for the gauntlet tank.
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Offline Kidpellet

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Re: Inside an Air Javelin
« Reply #35 on: October 29, 2020, 08:57:24 PM »
looks good , you running the stock 1100 pisi reg for the gauntlet tank.

Yep, I checked it with a reg tester and it was dead on 1100.
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Offline Rob M

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Re: Inside an Air Javelin
« Reply #36 on: October 29, 2020, 09:57:45 PM »
will the stock bolts handle the pressure  and if so whats the speed ? my guess is 350 ish
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Offline Kidpellet

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Re: Inside an Air Javelin
« Reply #37 on: October 29, 2020, 11:59:00 PM »
Mines actually not any faster at 1100 psi. It needs a little more hammer spring although there is a hammer spring adjusting screw under the sliding stock. It works backwards though. Counterclockwise increases preload and clockwise decreases it. It's also got a pretty small planum space. Increasing that would probably do more than upping the pressure. Also it's a cast aluminum valve body and not the best for higher psi
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Offline grand-galop

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Re: Inside an Air Javelin
« Reply #38 on: November 09, 2020, 03:28:29 PM »
I finally got mine.. 8)
Before receiving it, i already modded a 90g tank with a one way fill nipple..

Initial testing was like others have mentionned on here..

My surprise was when i change the target tip from 50 grain to 100 grain, the fps was more consistant and develop 33 fpe..

I have put graphene powder in the hammer slot and lower the hammer spring to get the 260fps average with the 100g target tip.
  • Rouyn-Noranda, Quebec,Canada
Benjamin trail np .22
crosman phantom .22
crosman 2240 hpa conversion
QB-79 hpa .22
crosman optimus .22
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Crosman 2289 highly mod
crosman TR-77 NPS
Umarex Surge .117

Offline Carlito29

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Re: Inside an Air Javelin
« Reply #39 on: June 01, 2021, 04:44:27 PM »
Pretty amazing what can be done…….  I will be watching this to see what transpires when the ball starts rolling again. I recently purchased AJ also and decided see if by chance someone here had Thayer it to another level. Thanks
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