Baz JJ Posted July 24, 2013 Share Posted July 24, 2013 Does anybody know how a chrono actually measures the speed of a BB passing through it ? Link to comment Share on other sites More sharing options...
Zak Da Mack Posted July 24, 2013 Share Posted July 24, 2013 I believe it uses some clever maths by measuring the time between the entry and exit of the BB and it then works out the FPS from that Link to comment Share on other sites More sharing options...
Suzuki Yamamoto Posted July 24, 2013 Share Posted July 24, 2013 This should explain it for you Link to comment Share on other sites More sharing options...
Supporters jcheeseright Posted July 24, 2013 Supporters Share Posted July 24, 2013 Not particularly clever maths, speed = distance/time. Link to comment Share on other sites More sharing options...
TacMaster Posted July 24, 2013 Share Posted July 24, 2013 Just GCSE physics level maths, as cheese said Link to comment Share on other sites More sharing options...
Unrustle_Thine_Jimmies Posted July 24, 2013 Share Posted July 24, 2013 Tiny fairies inside get the speed of the BB with pencils and paper and then put it on a screen. Link to comment Share on other sites More sharing options...
Supporters M_P Posted July 24, 2013 Supporters Share Posted July 24, 2013 Just GCSE physics level maths, as cheese said Pre-gcse level. I remember doing the speed equation among others in like year 7. Link to comment Share on other sites More sharing options...
TacMaster Posted July 24, 2013 Share Posted July 24, 2013 They've changed the syllabus since then, science isn't split down into physics/biology/chemistry for the lower years, and the speed equations etc are part of P2 now. Link to comment Share on other sites More sharing options...
Baz JJ Posted July 24, 2013 Author Share Posted July 24, 2013 How does it detect the passing of the BB to start and stop the calculation ? Link to comment Share on other sites More sharing options...
Mack Posted July 24, 2013 Share Posted July 24, 2013 Not 100% sure but think there is two lazer beams, one at each end to detect the bb passing Link to comment Share on other sites More sharing options...
Zak Da Mack Posted July 24, 2013 Share Posted July 24, 2013 If you're looking to make your own chrono, I believe there is a thread on here that shows how to make one out of in-ear headphones and tin foil. EDIT: found the link. http://www.airsoftsniperforum.com/32-general-sniper-talk/4264-how-make-homemade-chronograph.html Link to comment Share on other sites More sharing options...
david0512 Posted July 24, 2013 Share Posted July 24, 2013 As others have said, the maths is not really that complicated. Speed = Distance/Time Two laser beams in the chronograph record when the bb passes through them. The time between the first and the second beams being crossed can then be worked out. The time is scaled up so that it = 1 second. The distance is scaled up by the same amount. This distance is the feet/second speed. Link to comment Share on other sites More sharing options...
Supporters Ian_Gere Posted July 30, 2013 Supporters Share Posted July 30, 2013 I'm 99% certain that no lasers are involved. I've certainly never seen any holes through which a laser could shine, nor any for receivers to detect when/if the laser is interrupted (bear in mind that when lasers are randomly wandering around in films, and thieves must play mime-twister to get past them, that is complete bollocks - a laser detection system needs an emitter and receiver, so either the receiver must detect a beam steadily shining on it, or the receiver system must be sophisticated enough that it can detect a predetermined degree of reflected laser light from a preprogrammed 'random' beam sweep, in which case Ms. Zeta Jones could be as bendy as Blu Tac but her presence in the room would cause disruption in the reflection pattern whether she interrupted a beam or not). As far as I know it's a mini radar. Link to comment Share on other sites More sharing options...
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