NateChrony

Thanks heaps Tommikka... So really - just lots & lots of Chrono's. Before walk on, or during registration or "official check" - there is an official with a chrono to verify, then the player may need another one to dial in some settings on the side. Having someone walk the line with a chrono may also help speed things up? Is it 3 shot average - or will 1 shot do? How consistent are guns generally? Is it also different speeds per class - close/sniper etc?

(Firstly apologies for a n00b q - there seems to be a good amount of variance on how this is done depending on the field/event) At a event like the National Airsoft Festival - or maybe "more stricter" fields, there's a requirement to Chrono before you get onto the field. Am I correct that it would be ideal that everyone chrono's every time before walk on, but typically its not done due to efficiency? Whats the procedure look like? some vids of a station at live event would be good How many stations are there at an event? Is there a rough number per attendee that would be ideal? Most appear to supply bbs to check with, typically 0.2g It would be good to be able to specify BB weight quickly? Joule creep etc (most fields are moving to this instead of 0.2 BB tests?) You take multiple (3?) shots & get an average reading, or is 1 enough? If its below the velocity for that specific class then you pass

yeah to a point (as others have noted) - as the wider apart you have them, the more the pellet/BB may be slowing down between them. This could be even more pronounced with airsoft BBs - the BC may be very different. Looking at rough size/spacing of common chronographs: At Airsoft speeds (250fps) - its a pretty trivial task on the electronics, you're talking ~500+ microseconds between sensors. 1 microsecond at 1000fps is the difference between 1000fps & 1008fps 1 microsecond at 250fps is about 1/2fps difference Another way of of looking at it is tolerance of assembly/dimensions: @200fps - 0.1mm = 0.2fps @1000fps - 0.1mm = 1.25fps The mounting is probably the most critical - i'm constantly amazed at how much vibrations & slight wobble have on the readings. But this is when I calibrate at 1,000fps - expect something like a 5fps variance if there's bad mounting, thats why I chose muzzle mount.

(full disclosure - I make chronographs) 0.66J vs 1J with 0.28gram is 225fps vs 277fps That's a huge amount of difference in terms of timing. Most of the manufacturing tolerances & timing uncertainty in designs is typically ~10-15fps when shooting 1000fps, with sensor spacing of 50-100mm or so. 50fps at that slow speed is something outside of a chrony's usual issues If it was gas - that could definitely cause an issue, anything that is a liquid & expanding can leave a vapour cloud & cause issues with optical sensors - typically you get high readings as the vapour can move faster than the BB. I'd say the chrony has a fault, take it to the field with you next time & compare side by side to rule out the conditions on the day. You could also possibly open it up & see if you can clean the sensors - cue tip & alcohol should be enough.