Author Topic: Five Easy Probes  (Read 61906 times)

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Offline JEBert

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Re: Five Easy Probes
« Reply #60 on: March 26, 2013, 09:45:10 PM »
It would be much easier to design a bolt with an end that just directed the air to the front without regard to placing the pellet.  Then have a hand-held probe that would push the pellet in, perpendicular to the bolt to a point just ahead of the transfer port.   You wouldn't need to close the bolt on it, just have it the right shape to fit into the chamber and length to push the pellet to the right place while the bolt is open. The hand-held piece might have to be held to the gun with a lanyard to keep from losing it.
Cheers,
Jerry
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Offline ped

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Re: Five Easy Probes
« Reply #61 on: March 26, 2013, 10:41:42 PM »
i used to use an old allen key(hex driver) cut down to so that it  pushed the pellet past the port i then got a hollow probe and never used this method(i didn't have a chrono so i never new how well this worked)
ped

Offline JEBert

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Re: Five Easy Probes
« Reply #62 on: March 27, 2013, 04:12:06 AM »
Quote
i didn't have a chrono so i never new how well this worked
How was the accuracy?
Jerry
NRA Life Member
USAF Veteran 1973-1977 (43151E) Sgt (E-4)


Offline BerkshireHunter

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Re: Five Easy Probes
« Reply #63 on: April 14, 2013, 04:00:04 AM »
Just stumbled on this, great testing. Never thought the different probes would make that much difference. (And I thought a stock 2240 was closer to 450 fps) Each gun's different.   :-*

Offline quickster47 †

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Re: Five Easy Probes
« Reply #64 on: April 14, 2013, 04:08:09 AM »
Each gun can be very different.  Also, Crosman advertises the 2240 as "Up to 460 fps" but they never ever list the actual pellet and pellet weight they use to achieve that velocity.  Heck, with a Prometheus alloy pellet I can get 550 fps but it won't have much stopping power because the pellet is so light.

Carl

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Offline Cwlongshot

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Re: Five Easy Probes
« Reply #65 on: April 28, 2013, 03:01:03 PM »
Just stumbled on this, great testing. Never thought the different probes would make that much difference. (And I thought a stock 2240 was closer to 450 fps) Each gun's different.   :-*

Same here!!  I have been searching the web for this kind of info. Very nice to find it right here at home!  Yesterday I modified my own probe on my '77. I was going to remove the factory brass .010 beyond the O ring. But after drilling decided to just thin it to give support for the steel probe. BUT all I really needed to do was drill deeper for that support.   :o :o

I have picked up a couple more probes and will mod one for my 2240 too.  :P :P

I agree it would be a crying shame if this post was not stickied!!

THANK YOU SO MUCH for all the effort and expense providing this information for all who follow!!!  :-* :-* :-* :-* :-*
« Last Edit: April 28, 2013, 03:03:31 PM by Cwlongshot »
BENJAMIN's: 392PA '11 • Marauder .25 • MAC1 tuned Disco .22 • 397P Nickle '81

CROSMAN's:  1389 Back Packer .20 '86 • Hawthorne M140 4th variant • 357 W/8'' '90 • 760 '75 • 1377 '13 CARBINE LOTS ''O'' Mods • 2200 Magnum '81 (First Gen) • 2100 '13 • 2240 '13 

DAISY's:  25 '10 • Red Ryder • 22X • 922

DIANA's:  34 .22 '05 (RWS)

SHERIDAN's:  Blue Streak '82  Steroid • Blue Streak '65 Steroid • Blue Streak '70 • Blue Streak '72 • C9 Blue Streak
 
WEBLY's:  Longbow .177 • Hurricane  .177

XISICO's:  XS60c .22 PCP

Offline Colt25

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Re: Five Easy Probes
« Reply #66 on: May 29, 2013, 06:27:58 PM »
Both my 13xx guns have OEM bolts that I have filed down the probe on a lathe.

~5 fps increase. It's laughable.

Offline splat

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Re: Five Easy Probes
« Reply #67 on: July 10, 2013, 05:53:22 PM »
Just found this, VERY interesting and thanks for all your work.
It seems to me that the perfect answer would be for someone at Crosman to design a gun where the bolt is the valve/gas store.
pull bolt back and it connects at rear to accept a charge of gas, push forward and lock. then bolt contains one shot worth of gas.
No transfer port to snag, no directing gas through two 90 degree turns to get it behind pellet.
lol who knows one day they may make the perfect gun (probably the day before they become obsolete in favour of laser blasters).
again thank you. ATB.
To err is human, but to really screw up you need promotion.

Offline arkmaker

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Re: Five Easy Probes
« Reply #68 on: July 29, 2013, 11:15:35 PM »
Just found this, VERY interesting and thanks for all your work.
It seems to me that the perfect answer would be for someone at Crosman to design a gun where the bolt is the valve/gas store.
pull bolt back and it connects at rear to accept a charge of gas, push forward and lock. then bolt contains one shot worth of gas.
No transfer port to snag, no directing gas through two 90 degree turns to get it behind pellet.
lol who knows one day they may make the perfect gun (probably the day before they become obsolete in favour of laser blasters).
again thank you. ATB.


That would be an Air Force gun...... also would take all the fun out of modding these bad boys!!  ;)
I Am A Natural Mad Air Gunner  -  Full Of Hot Air & Ready To Expel It Quickly!

114 Rifle, 2240XL Pistol, 1861 Shiloh Pistol, 357 Pistols, Titan GP Rifle, PM66 Rifle, 2400KT .177 LW Carbine, CZ T200 Rifle, Benjamin Discovery .177 Rifle, Hammerli 850 Air Magnum in .22

Offline Gipper49

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Re: Five Easy Probes
« Reply #69 on: October 13, 2013, 06:02:23 PM »
I realize I am kinda late to this party but how about a 2 prong fork type probe?  The 2 prongs would be perpindicular to the breech when loading then parallel(sp?) when loaded.  Or think of it as a slotted flow through bolt.  Then you could taper the slot for best flow.
If that still doesnt make sense make a Peace sign and then flatten your wrist.

Brian
"Life is what happens while your busy making other plans"

Offline quickster47 †

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Re: Five Easy Probes
« Reply #70 on: October 14, 2013, 01:41:46 AM »
Brian that sounds like an interesting idea.  Make me one and I'll do some free testing for you.  :)

Carl

I've never wanted something so useless in my life.
In Omnia Paratus
1947-05-19 - 2016-07-14 †

Offline The Robin

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Re: Five Easy Probes
« Reply #71 on: October 17, 2013, 01:30:32 PM »
Just been reading through this thread as a newbie, very interesting reading and also great work on the testing  :-*

Offline sshewins

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Re: Five Easy Probes
« Reply #72 on: November 05, 2013, 04:31:32 AM »
Hey Carl, thinking in terms of cavitation of airflow, how does this idea sound. A hollow probe, BUT, instead of just drilling  it per se, use a round dremmel type bit and only going as far as necessary to meet up with the port opening. Basically, like porting and polishing on a hot rod engine.

My minds eye has a perfectly smooth air pathway.  Take more work to do, but perhaps the benefits would be similar to your oil can set up, and slightly more practical.
Scott

Finally... Got me a crosman bug out 2289

Offline arkmaker

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Re: Five Easy Probes
« Reply #73 on: November 05, 2013, 10:31:49 AM »
Hey Carl, thinking in terms of cavitation of airflow, how does this idea sound. A hollow probe, BUT, instead of just drilling  it per se, use a round dremmel type bit and only going as far as necessary to meet up with the port opening. Basically, like porting and polishing on a hot rod engine.

My minds eye has a perfectly smooth air pathway.  Take more work to do, but perhaps the benefits would be similar to your oil can set up, and slightly more practical.


I like it :-*
I Am A Natural Mad Air Gunner  -  Full Of Hot Air & Ready To Expel It Quickly!

114 Rifle, 2240XL Pistol, 1861 Shiloh Pistol, 357 Pistols, Titan GP Rifle, PM66 Rifle, 2400KT .177 LW Carbine, CZ T200 Rifle, Benjamin Discovery .177 Rifle, Hammerli 850 Air Magnum in .22

Offline quickster47 †

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Re: Five Easy Probes
« Reply #74 on: November 05, 2013, 01:25:33 PM »
Hey Carl, thinking in terms of cavitation of airflow, how does this idea sound. A hollow probe, BUT, instead of just drilling  it per se, use a round dremmel type bit and only going as far as necessary to meet up with the port opening. Basically, like porting and polishing on a hot rod engine.

My minds eye has a perfectly smooth air pathway.  Take more work to do, but perhaps the benefits would be similar to your oil can set up, and slightly more practical.

I like that idea also.  Will give it some serious thought.

Carl

I've never wanted something so useless in my life.
In Omnia Paratus
1947-05-19 - 2016-07-14 †