Author Topic: 2031 FPS on air . Latest shot, 2162 FPS (Read 18161 times))

lloyd-ss · « **on:** March 22, 2016, 01:45:57 AM »

++++++++ EDITED by Lloyd-ss on 31 March 2016 with new post of 2162 FPS shot. See Reply # 33 for info.+++++++++

We've had a thread going in the R&D gate about what the maximum possible velocity of a PCP on air might be.
http://www.gatewaytoairguns.org/GTA/index.php?topic=102604.240
There is a lot of mumbo jumbo and theories floating around on mainly other airgun forums about "things" that limit the velocity of a PCP. Some had the theoretical limits as low as 1600fps. I don't think any of the guys on this forum were too keen on believing there were such artificial limits. Me personally, I always thought the limits were junk theories.
Anyway, don't tell me it can't be done.

The video shows, and explains the shot.

#

PBguns · « **Reply #1 on:** March 22, 2016, 01:57:04 AM »

That is the highest fps I read anywhere on air. Well done.........wow.

lloyd-ss · « **Reply #2 on:** March 22, 2016, 02:09:45 AM »

Thanks Mike.
I've heard a lot about what CAN'T be done, but I haven't heard much about what HAS been done.
And the 2031 fps shot was with a 9.1 gn pellet. Light for a .278, but it is still 83 fpe.
Lloyd

nielsenammo · « **Reply #3 on:** March 22, 2016, 02:12:41 AM »

Holy Smokes !!!

rsterne · « **Reply #4 on:** March 22, 2016, 02:13:18 AM »

WELL DONE LLOYD !!!

Bob

Motorhead · « **Reply #5 on:** March 22, 2016, 03:12:51 AM »

O' yea .... records standing or hear-say to limits are No More !!

Well done lloyd

MichaelM · « **Reply #6 on:** March 22, 2016, 05:28:19 AM »

thats COOKING!!!!! wow ya know it wasn't as loud as I thought it would be!! efficient use of the plenum size and barrel length??

Rocker1 · « **Reply #7 on:** March 22, 2016, 06:35:47 AM »

JEEZ!!!! Lloyd give Lloyd some air and a barrel. Just Wow!! David

Rdsail · « **Reply #8 on:** March 22, 2016, 06:44:29 AM »

Lloyd,

Impressive. It is all I can say.

Daniel

Wayne52 · « **Reply #9 on:** March 22, 2016, 07:24:11 AM »

Very cool

StevenG · « **Reply #10 on:** March 22, 2016, 10:07:30 AM »

Cool!
I bet diablos wouldn't like that speed at all.

David Mccann · « **Reply #11 on:** March 22, 2016, 10:10:47 AM »

thats serious. wow good job sir.....

lloyd-ss · « **Reply #12 on:** March 22, 2016, 10:13:45 AM »

Thanks guys, for the words of encouragement. This has been a fun project and I think it shows that there is still a lot of un-tapped potential in PCPs. The pellet release mechanism is key to the high vel in this set-up. Letting the pellet get 100% of the air pressure behind it before it starts to move.
Lloyd
P.S. Michael M and David, I plan on bringing this contraption to the Funshoot in Kentucky in May. With that 47-1/2" long barrel we might have to call it the Kentucky long rifle while its there. I have no idea if it will hit the broad side of a barn, though.

lloyd-ss · « **Reply #13 on:** March 22, 2016, 10:35:48 AM »

Quote from: StevenG on March 22, 2016, 10:07:30 AM

Cool!
I bet diablos wouldn't like that speed at all.

Hard to say. They've never been shot that fast before, LOL.

Mod90 · « **Reply #14 on:** March 22, 2016, 10:50:01 AM »

Very nicely done Lloyd. Congrats, & thanks for pushing the limits of whats possible. Without guys like you I think the world might be pretty mundane.

And you are quite correct in your thinking, if the pellet can be held in place in the barrel & form a good seal until the maximum pressure & volume is behind it, then that would be the best way to make use of the fullest potential of the KE in the air behind it.
Also I feel the smooth bore barrel helped a little, & I am getting the feeling that friction from the oring may have robbed you a little velocity, but nothing much to worry about/cry foul over.

I can't wait to see what's next

Tuckeron · « **Reply #15 on:** March 22, 2016, 11:07:47 AM »

Am I the only one who thinks our airgun community should proceed with caution before implementing This further?

Otherwise the government will restrict air rifles even more.

But congrats and thanks for pushing the envelope!

lloyd-ss · « **Reply #16 on:** March 22, 2016, 11:28:23 AM »

Quote from: Tuckeron on March 22, 2016, 11:07:47 AM

Am I the only one who thinks our airgun community should proceed with caution before implementing This further?

Otherwise the government will restrict air rifles even more.

But congrats and thanks for pushing the envelope!

Thank you for the congrats, but Please, in the interest of not hijacking the thread, if you want to have such a discussion about government regulation, start another thread. This thread is about the challenge and the fun of getting high velocities out of airguns. 'Nuff said!

Thank you,
Lloyd

rsterne · « **Reply #17 on:** March 22, 2016, 11:29:29 AM »

I don't think you need to worry too much about "implementing" supersonic airguns.... The combination of the lightweight pellet required, and the corresponding low BC, will insure that the pellet is subsonic again before travelling more than a few yards.... You would get to alarm everyone with the report / shockwave, only to get none of the benefits.... *LOL*.... My guess as to downrange velocity would be about 1100 fps at 15 yards and 650 fps at 50 yards....

This experiment is basically for two reasons.... to put to rest the idea that the limits previously proposed for PCPs (sonic choking, molecular velocity) simply do not apply.... and to further our understanding of the Internal Ballistics of PCPs to improve our mathematical models of the same.... Interestingly, the Spreadsheet Lloyd has been using for several years is, so far, right on the money in predicting the performance we are seeing.... within less than a 1% error....

Bob

lloyd-ss · « **Reply #18 on:** March 22, 2016, 11:46:40 AM »

Quote from: rsterne on March 22, 2016, 11:29:29 AM

.............. *LOL*.... My guess as to downrange velocity would be about 1100 fps at 15 yards and 650 fps at 50 yards....

................................
Bob

Dang it BOB!

Are you putting up a challenge!

A redesign of the projectile, while keeping the release technique the same, just might do it. Of course shooting such a thing at 50 yards and not hitting the chrony might be more of a challenge. Hey, can I borrow your chrony, or maybe two of them?

Lloyd

Onebaddj · « **Reply #19 on:** March 22, 2016, 12:35:14 PM »

That is awesome. Nice work.

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2031 FPS on air . Latest shot, 2162 FPS

Author Topic: 2031 FPS on air . Latest shot, 2162 FPS (Read 18161 times))