TRINITY Posted March 10, 2021 Report Share Posted March 10, 2021 Bought an FX wireless chronograph the other day. Seemed a great bit of kit and so easy to set up. Also quite a bit of good press on you tube. However I was surprised to see my R10 was between 9.8 and 10.3 over various pellet types. The gin had a full service and reseal quite recently and when it was return ther was a document stating it was about 11.2 My son and grandson both have air rifles and both were also tested and both of theirs were lower than they believed by about 1ft lb. I know the best way would be to get a competitive calibration on another machine but with lockdown that is too difficult. Unless I am missing something the unit is fixed and cant have its calibration adjusted. Just wondering if anyone out there had experience of this type of chrono , or could offer any advice. Quote Link to comment Share on other sites More sharing options...
scarecrow243 Posted March 10, 2021 Report Share Posted March 10, 2021 Hi i have one and its fine are you putting all the settings in ie uk air gun 12f1lb .22 or .177 pellet weight domed pointed or hollow point if you put any of them wrong you will not get a true reading Hi forgot to say are you using the same pellets and weight ie on the document after service unless it does say what the pellet was and weight you wont get the 11.2 1lb Quote Link to comment Share on other sites More sharing options...
TRINITY Posted March 10, 2021 Author Report Share Posted March 10, 2021 Yes gone over it on my phone put all the settings in correct and used different pellets and used both a 22 and 177 gun. It must be accurate because if I set it up for a particular pellet, fire a few and get a good average reading ,then switch pellet the machine recognises it immediately and the readings are different. Maybe I will have to try and use another chrono and test the comparative readings... Quote Link to comment Share on other sites More sharing options...
scarecrow243 Posted March 10, 2021 Report Share Posted March 10, 2021 it could be you are getting true readings and your service report is wrong Quote Link to comment Share on other sites More sharing options...
villaman Posted March 10, 2021 Report Share Posted March 10, 2021 All depends where about you fit it to your barrel, to far forward may give you under power to far back might give you higher readings, or the other way round . Even FX said this them selves, after contacting FX with this problem Quote Link to comment Share on other sites More sharing options...
scarecrow243 Posted March 10, 2021 Report Share Posted March 10, 2021 i have used mine on the end of the sound moderator but find its better putting it on a bench or car bonnet then lean the guns air res on top gives the best readings Quote Link to comment Share on other sites More sharing options...
TRINITY Posted March 11, 2021 Author Report Share Posted March 11, 2021 12 hours ago, villaman said: All depends where about you fit it to your barrel, to far forward may give you under power to far back might give you higher readings, or the other way round . Even FX said this them selves, after contacting FX with this problem Quite honestly if that's true then it's not acceptable. It makes a mockery if you move it and it alters the reading because you have no way of knowing which is the optimum position and which reading to believe. Surely they should offer some guidance and indicate the ideal length from the end of the muzzle. After saying all that I have placed it at various positions on the sound moderator and seen no difference as such. I have watched a few videos and about 2 inch from the end seems about what most people prefer so i stick with that. On the plus side it gives me something interesting to continue and experiment with during this boring lock down 😁 Quote Link to comment Share on other sites More sharing options...
villaman Posted March 13, 2021 Report Share Posted March 13, 2021 On 11/03/2021 at 09:02, TRINITY said: Quite honestly if that's true then it's not acceptable. It makes a mockery if you move it and it alters the reading because you have no way of knowing which is the optimum position and which reading to believe. Surely they should offer some guidance and indicate the ideal length from the end of the muzzle. After saying all that I have placed it at various positions on the sound moderator and seen no difference as such. I have watched a few videos and about 2 inch from the end seems about what most people prefer so i stick with that. On the plus side it gives me something interesting to continue and experiment with during this boring lock down 😁 On my FAC guns it can be as much as 40 FPS and sub 12 10 FPS Quote Link to comment Share on other sites More sharing options...
TRINITY Posted March 13, 2021 Author Report Share Posted March 13, 2021 25 minutes ago, villaman said: On my FAC guns it can be as much as 40 FPS and sub 12 10 FPS So what is the correct distance from the end of the barrel. They offer no guidance with the product. If its positioning effects accuracy of readings surely it needs mentioning Quote Link to comment Share on other sites More sharing options...
Ultrastu Posted March 13, 2021 Report Share Posted March 13, 2021 I'm not sure how the dopplar radar is supposed to work on these chronos ? At what range does it read the pellet speed and over what distance. ? Ie .my lmbr chrono .reads at the range the chrono is set from my muzzle. And the distance is between the 2 sensors so about 80 mm . The lab radar chrono .can track a pellet out to 100 yds and give you the speeds at every 10 yds .which is very cool and great for workingvot the bc of pellets . And if I had the cash and need for one id have one . But the fx chrono (for all I know .) Reads the speed 1 m away from the muzzle over 500 mm ? Which would give lower readings than a true end of muzzle velocity . AND is why I dont own one . My mate does though .and he likes his .though I've never got too involved with it . Quote Link to comment Share on other sites More sharing options...
Chaz25 Posted March 13, 2021 Report Share Posted March 13, 2021 Could try taking the velocity and do the mathematics your self and compare results my airforce crono only gives velocity so I need to calculate, but dose not seem distance sensitive. Quote Link to comment Share on other sites More sharing options...
TRINITY Posted March 13, 2021 Author Report Share Posted March 13, 2021 The fx chrono can be set for ft lbs or ft per sec so no calculating required. Ultrastu, surely if it measures velocity when the pellet is at 1 metre from muzzle , the device could be factory calibrated to the true speed at the muzzle. Quote Link to comment Share on other sites More sharing options...
Ultrastu Posted March 13, 2021 Report Share Posted March 13, 2021 Perhaps . I dont know . It seems a bit like witch craft to me . I'm more comfortable with a normal infrared chrono over a set distance where I'm in control of the parameters . Quote Link to comment Share on other sites More sharing options...
scarecrow243 Posted March 13, 2021 Report Share Posted March 13, 2021 mine gives the same reading if its on the end of the moderator or i lean the air cylinder of the rifle on top of the fx i prefer the latter as it will move about on the moderator Quote Link to comment Share on other sites More sharing options...
figgy Posted March 14, 2021 Report Share Posted March 14, 2021 I don't like the FX chrono as it's readings are to the nearest rounded three FPS. How can a inch or two make such a difference to how it reads. If that's the case they should state exactly how far from the muzzle it should be as they will be calibrated for a set distance. The only decent radar chrono is the lab radar. Only way you can get the FX to work close enough is to shoot over a known chrono at 1m from muzzle then adjust the position of the FX radar until it's the same readings take a measurement so you can repeat each time. Otherwise you might as well put your finger in the air and take a wild guess. Quote Link to comment Share on other sites More sharing options...
villaman Posted March 16, 2021 Report Share Posted March 16, 2021 On 13/03/2021 at 20:09, TRINITY said: So what is the correct distance from the end of the barrel. They offer no guidance with the product. If its positioning effects accuracy of readings surely it needs mentioning There is no correct distance. On my two FAC air it about 80 mm back , sub 12 about 50 mm , on one gun then the other 25 mm . The way to tell is to get FPS to read evenly Quote Link to comment Share on other sites More sharing options...
scarecrow243 Posted March 17, 2021 Report Share Posted March 17, 2021 plenty info on the fx chrono on you tube Quote Link to comment Share on other sites More sharing options...
Mini Magnum Posted March 20, 2021 Report Share Posted March 20, 2021 Just buy an LMBR and get a much better chronograph, that is consistent . Quote Link to comment Share on other sites More sharing options...
old'un Posted March 20, 2021 Report Share Posted March 20, 2021 Looking at all the variables it does make me wonder just how many people could be using air rifles that are well under there stated power or possibly over the legal limit?? Does anyone know how the police check the ft lb in the field if you are stopped and questioned about the power of your rifle? Quote Link to comment Share on other sites More sharing options...
Ultrastu Posted March 20, 2021 Report Share Posted March 20, 2021 They don't check in the field .they seize your guns and take them away for testing . Some times your lucky if they come back in one piece or at all . Best not to give reasonnfor testing in the first place And if you do feel you could possibly get pulled .carry a simple chrono with your gun so it is possible for you to show its legal in the field . A combro is best for this situation . Quote Link to comment Share on other sites More sharing options...
TRINITY Posted March 22, 2021 Author Report Share Posted March 22, 2021 On 20/03/2021 at 18:16, Ultrastu said: And if you do feel you could possibly get pulled .carry a simple chrono with your gun so it is possible for you to show its legal in the field . A combro is best for this situation . That is one of the primary reason I chose the FX chrono. Extremely light ,simple to use. Since I started this post, I have tried it on a number of guns. I have come to the conclusion it seems quite accurate and provided its somewhere between an inch and 3 inch from the end of the muzzle the readings are not affected. OK it's not going to give you the accuracy of the forensic firearms lab, but is still a fair guide to where you are. All I need to do now is somehow get the bloody anti tamper cover removed as I am sure I have a good ft lb to play with and still remain comfortably within the limit. Quote Link to comment Share on other sites More sharing options...
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