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 Post subject: A chrony can be off ?
PostPosted: Fri Nov 05, 2021 5:03 pm 
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Joined: Tue Feb 19, 2008 10:45 am
Posts: 191
Location: Quebec, Quebec
Hi, i brought a acetech chorny Acetech AC5000 - Testeur de vitesse pour pistolet Airsoft BBS https://www.amazon.ca/dp/B075DZW34K/ref ... UTF8&psc=1 because my F1 dont whant to work inside.

My concern is the cheap one look to give me 30 fps slower all the time. Exemple my stock 2240 with crosman 14.3 gr read around 380 fps now with a 10.1" barrel and a long probe i read 465 fps. With the daisy avanti 853c i read 420 fps with crosman 7.4 gr the rifle is suppose to be at 490 fps.

The real problem i have is with my custom target 2240 convert in 177, it give me just under 500 fps but if the chrony is 30 fps off now i am outlaw with my target gun. The gun is build like a 2300s who advertise 520 fps.

You think the new chrony can be off ???

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PostPosted: Fri Nov 05, 2021 5:10 pm 
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It is loosely called a chronograph - it is not a Chrony, which is a brand name. This cheap chronograph might or might not be accurate.
Seems to be doing fine, but what can you expect from something that costs so little & is sold as an air soft chronograph.
The Caldwell would have been a better buy and likely will produce more accurate results, just by it's nature - how it works with sky screens.
If your gun was sold as a sub-500fps & 4.2fpe gun, it is still one.

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PostPosted: Fri Nov 05, 2021 5:20 pm 
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Daryl wrote:
It is loosely called a chronograph - it is not a Chrony, which is a brand name.


Uhh.... Looks I made this mistake too... :eek:

How about 'chrono' in short?!

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PostPosted: Fri Nov 05, 2021 5:26 pm 
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Location: Quebec, Quebec
Daryl wrote:
It is loosely called a chronograph - it is not a Chrony, which is a brand name. This cheap chronograph might or might not be accurate.
Seems to be doing fine, but what can you expect from something that costs so little & is sold as an air soft chronograph.
The Caldwell would have been a better buy and likely will produce more accurate results, just by it's nature - how it works with sky screens.
If your gun was sold as a sub-500fps & 4.2fpe gun, it is still one.


The 2 crosman was not stock, barrel valve probe trigger everything is modified. I have a real chrony F1 who cost me lot of $ 20 years ago just not logic to repay the big price for something because i can use the good one outside all the time.

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PostPosted: Fri Nov 05, 2021 5:35 pm 
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OK- look at it this way.
If a cop looked at the name and model of the gun (highly unlikely unless you were doing something you were reported for) along with the S# (if it has one) and
"ran them", would it come up as a non-firearm? If it did, it is still a non-firearm. Only if the gun was confiscated by police and sent to the lab (forensics) would
it then be chronographed. I will let you in on a secret about forensics labs. Even if it did not "go over" they would make it do so, just for the stat. I was warned
of this by an RCMP "member" in the forensics lab in Vancouver, back in 1974. They were a good bunch of guys, friendly, but "stats are stats" - his words.
So - make of that what you will.

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PostPosted: Fri Nov 05, 2021 5:52 pm 
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Location: Quebec, Quebec
Oki for a basement shooter like me a 2240 tube is a 2240 . :wink:

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PostPosted: Fri Nov 05, 2021 7:59 pm 
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Semantics aside, a chronograph can be "off" and the reading can also be affected by muzzle blast depending on the propellant (like CO2 for example). The Shooting Chrony brand has this to say about the accuracy of their product:

[i]Accuracy: 99.5% or better. Displayed velocity will not differ from actual velocity by more than 1 part
in 200, i.e., ±10 fps on a velocity reading of 2000 fps (or 2.5 fps at 500 my input). Typical performance is generally better, and
shot-to-shot repeatability is always more accurate, i.e., Reported Mean Instrumental Velocity may
differ by as much as 0.5% from actual mean instrumental velocity, but Standard Deviation calculated
from data gathered with a Chrony will always be closer than 0.5% to actual Standard Deviation for a
string. This is an important fact because an accurate measurement of a load’s uniformity is of
considerably more importance than is an exact measure of its average velocity.[/i]


Your Amazon product doesn't say what its accuracy is, it just says high accuracy. Maybe it's only 95% which would mean +-25 fps in 500. It also says it self calibrates, see if you can manually calibrate it to match what your F1 says (outside or inside is the same, believe your F1).

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PostPosted: Sat Nov 06, 2021 12:59 am 
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Location: Quebec, Quebec
Dukemeister wrote:
Semantics aside, a chronograph can be "off" and the reading can also be affected by muzzle blast depending on the propellant (like CO2 for example). The Shooting Chrony brand has this to say about the accuracy of their product:

[i]Accuracy: 99.5% or better. Displayed velocity will not differ from actual velocity by more than 1 part
in 200, i.e., ±10 fps on a velocity reading of 2000 fps (or 2.5 fps at 500 my input). Typical performance is generally better, and
shot-to-shot repeatability is always more accurate, i.e., Reported Mean Instrumental Velocity may
differ by as much as 0.5% from actual mean instrumental velocity, but Standard Deviation calculated
from data gathered with a Chrony will always be closer than 0.5% to actual Standard Deviation for a
string. This is an important fact because an accurate measurement of a load’s uniformity is of
considerably more importance than is an exact measure of its average velocity.[/i]


Your Amazon product doesn't say what its accuracy is, it just says high accuracy. Maybe it's only 95% which would mean +-25 fps in 500. It also says it self calibrates, see if you can manually calibrate it to match what your F1 says (outside or inside is the same, believe your F1).



Thank its a good explanation, i have to wait until i can use my f1 to check my velocity..

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PostPosted: Sat Nov 06, 2021 5:06 am 
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Location: Dowling ,ontario
If you want your F1 to work indoors . Put it a box with two separate light sources and cut holes for the pellet to fly through on either end. The problem is usually with fluorescent lighting which give false readings or errors. Another option is to use bright led light ( stick ons ) on the light filters. The problem with the later is going through batteries.

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PostPosted: Sat Nov 06, 2021 9:03 am 
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Location: Quebec, Quebec
Hobbyman2007 wrote:
If you want your F1 to work indoors . Put it a box with two separate light sources and cut holes for the pellet to fly through on either end. The problem is usually with fluorescent lighting which give false readings or errors. Another option is to use bright led light ( stick ons ) on the light filters. The problem with the later is going through batteries.



Just brought a set of 3 LED light i will try it when a get a 10 min of spare thank for the hint

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PostPosted: Sat Nov 06, 2021 12:10 pm 
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Location: P.G. B.C.
LED pucks from Canadian Tire.
Florescent lights have fluctuating light (not visible to the eye) inside the tubes traveling end to end, back and forth.

The pucks are held to the top of the diffuser panels with rare earth magnets.


Attachments:
Indoor Shooting Chrony.JPG
Indoor Shooting Chrony.JPG [ 124.23 KiB | Viewed 627 times ]

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PostPosted: Sat Nov 06, 2021 1:30 pm 
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Posts: 191
Location: Quebec, Quebec
Daryl wrote:
LED pucks from Canadian Tire.
Florescent lights have fluctuating light (not visible to the eye) inside the tubes traveling end to end, back and forth.

The pucks are held to the top of the diffuser panels with rare earth magnets.



Nice that s the set up i will try until i finish to rebuilt my 853c i swear a lot lol

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PostPosted: Sat Nov 06, 2021 2:26 pm 
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Location: Kingston, ON
My Chrony still usues the long cylinder incandescent bulbs it came with. But indoor lighrs are all led now, i wonder if that will be bright enough for indoor, if i will need individual led on each light shield?

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PostPosted: Sat Nov 06, 2021 2:45 pm 
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Location: Quebec, Quebec
The cheap one is off it s sure, i just finish to reseal a 853c. Before reseal i get 420 fps now 387 fps but the bing is munch more lound now. The chamber o-ring (red one) had melt may be my son put some kind of wd40 or stuff like that on it but chrono says it s weaker and sound on trap is lounder ...

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PostPosted: Sat Nov 06, 2021 10:34 pm 
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Location: Chilliwack, BC
I've seen references to the "Amazon type" in various air gun groups and some seem satisfied.

I have an inexpensive one off AliExpress which cost $25.oo and agrees with my Shooting Chrony, a friend's, and two other higher end chronographs. Handy for doing adjustments and checking for problems. It also agrees with the published velocities for several .22 rimfires.

You might check against a more standard reference such as .22 LR to see if that Amazon unit agrees.

IDK that I would consider either type for center fire, especially as the muzzle blast is liable to wreck it, even if it could see the bullet through the gas cloud.

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