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Supersonic Airsoft BB's Take 2

Post questions and info about pneumatic (compressed gas) powered cannons here. This includes discussion about valves, pipe types, compressors, alternate gas setups, and anything else relevant.
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Supersonic Airsoft BB's Take 2

Unread postAuthor: Dave_424 » Fri Aug 06, 2010 9:55 am

Well, Im back with a new valve I machined myself for my .25 Gunpower stealth airgun.

Decided to shoot some airsoft BB's and see how fast they were going.

Im uploading the video evidence at the moment.

My control was a 20.1 grains H&N Field Target Trophy pellet = 1026 (There was a 1062 fps but I put that down to having the angle to the chrony not correct. The gun is 2000psi regualted so it is VERY consistant. All shots are within 10fps using airgun pellets

0.2g airsoft BB's were cracking at 1520 fps

0.12g Airsoft BB's were screaming at 1652 fps

Remember, this gun is firing on 2000psi...... yes 2000

So, how much faster do you think they could go with using regular air?? I was thinking around 1600 was the limit

I will update with the video

Dave

EDIT: Here is the video

[youtube]http://www.youtube.com/watch?v=L8hC6M6hgZI[/youtube]
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Unread postAuthor: jackssmirkingrevenge » Fri Aug 06, 2010 10:33 am

Impressive!

Not do doubt your results, but the muzzle blast seems to be reaching well over the chrony sensors and this could interfere with the reading. Have you tried moving a bit further back?
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Unread postAuthor: Dave_424 » Fri Aug 06, 2010 10:36 am

Ive actually got a video of me shooting a pellet, and then a BB.

Granted it was from my first attempts and they were moving around 1350 but you still hear the crack.

Let me see if I can find it.

Ive used the chrony with pretty much the barrel maybe a few inches away from the first sensor, never had a High/Low reading. How do you think the Combro chrony works, the muzzle can't be far away from the first sensor, and I know it has been consistantly used on airguns over 100 FPE

Dave
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Unread postAuthor: urgle the danish cow » Fri Aug 06, 2010 10:38 am

hey nice. is this a from one of the buckley books bc i know from reading the books that his valves are very similar to the gunpower stealth rifle
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Unread postAuthor: jackssmirkingrevenge » Fri Aug 06, 2010 10:40 am

Dave_424 wrote:How do you think the Combro chrony works, the muzzle can't be far away from the first sensor, and I know it has been consistantly used on airguns over 100 FPE


Unfortunately the Combro is prone to this problem, I remember it suggests my Skif is doing 5 ft/lbs when really it's not doing more than 3, and when tried with some high power airguns like the Shinsung Career, we only got good results when using a silencer.

Again, not trying to rain on your parade, just trying to be sure you're getting the right data ;)
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Unread postAuthor: Dave_424 » Fri Aug 06, 2010 10:46 am

Ive found the video of the supersonic crack, it is processing now.

Granted, the rifle in test using the combro was using a silencer.

You will see in the video, I first shoot a pellet and then the BB

Im using a SAK moderator.

Dave
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Unread postAuthor: Dave_424 » Fri Aug 06, 2010 11:26 am

Sorry for the double post but kinda relevant :D

Well, here is the long awaited proof :P

Note that I stuck the BB into the tip of the valve. There is a sharp edge there and it holds the BB so it doesnt roll down the barrel

[youtube]http://www.youtube.com/watch?v=HFUq00obxl4[/youtube]
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Unread postAuthor: Gippeto » Fri Aug 06, 2010 11:33 am

Dave...can you "dry fire" (quack fire.. :wink: :lol: ) over your chrony and post the results?

I've an F1, which doesn't seem to read the muzzle blast...despite popular opinion to the contrary. Others with F1's have noted the same result...curious how consistent this finding is.
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Unread postAuthor: Dave_424 » Fri Aug 06, 2010 11:38 am

I would be happy to, im using a Silencer/Moderator/Suppressor. But it isn't the best, it was cheap but it looked cool :D

I won't do it without the silencer because of neigbours :D

Dave
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Unread postAuthor: Gippeto » Fri Aug 06, 2010 11:42 am

Neighbors are a "fact of life"...

Mind...my nearest neighbor is almost a mile. :)

Thanks

1600fps+ is SMOKIN' good job on the valve. :D
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Unread postAuthor: Dave_424 » Fri Aug 06, 2010 11:49 am

Well, I have a neigbour either side of my 20 yards wide garden :D They are actually GREAT. They do put up with a lot of my noise

Results are in:

Basically, there were no readings at all from the chrony or errors even up to 1" away from the first sensor. It is a cold day today and there is a much more pronounced muzzle blast in this weather.

Until I got to about 1/2" there was an ERR 2. But that was it. A lot less sinsitive with air than people think. CO2 on the other hand......

Thanks Geppeto, The valve is actually for my .308 big bore build, so there is a bit of dead space in the 10mm ID breech. 1600 FPS can definatley make your ears ring.

Dave
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Unread postAuthor: spudtyrrant » Fri Aug 06, 2010 12:09 pm

Dave_424 wrote: But that was it. A lot less sinsitive with air than people think. CO2 on the other hand.....
my 3 inch porter would beg to differ :)
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Unread postAuthor: Dave_424 » Fri Aug 06, 2010 1:09 pm

Well..... up to the size that the launcher could effectivley launch the Chrony with its muzzle blast, my statement stands.

Maybe it is dirt/debris from your launcher or projectile that would cause a false reading. A piece of potato would definatley be recognised by the lights.

Dave
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