The point is that by the aircraft spotted - and YES, even therefore unreliable and at best a confirmation on a certain bird - we know the 13th altogether J-20 flew in January, which eqals for the LRIP birds confirmed 1 aircraft per 2 months. So if this is indeed the 15th LRIP aircraft and the other one was indeed no. 5 LRIP, then these would be 8 in two months ... IMO a bit on the high side.
If it is however only the 15th J-20 altogether - and here I agree, why painting a 15 if it does not denote the LRIPO batch ? - it would fit to the so far estimated low production rate ...
Deino
I have two challenges to that:
1: how much can we "confirm" that the 13th J-20 altogether flew in January? i.e. how do they know that it is 13th, and how do they know that it is 13 "altogether"?
2: if this new aircraft is 15th LRIP, and if we accept for the sake of discussion that the January aircraft is 13th overall (meaning 5th LRIP), then that is
10 aircraft in six months meaning less than two aircraft per month. I think that is reasonable.
Basically, a position that I am starting to believe is that since the beginning of 2016 we have basically lost any reliable count for how many LRIP J-20s have been built/flown because we do not have consistent photos of CAC's new J-20s (i.e.: either photos which are taken may be released with a delay, and/or that photos of new J-20s may lack their production serial numbers).
IMO then estimated number of J-20s that we have should be considered as a "minimum" rather than a "maximum" in our estimate range, and even then we should keep in mind that those estimates for past aircraft may not be reflective of how many were actually produced.
OTOH, with this latest photo of a J-20 with #15, it allows us to recalibrate our estimates a little bit with something that might reflect a firm LRIP/production number and gauge how many have been built in total over the last year and a half.
If we are able to continue and get a few photos of J-20 with numbers like that in the future, even if they are not sequential (like 16, 17, 18, 19, 20, 21, 23, 24) and instead are intermittent (like 17, 21, 24), it would still be a much better way to estimate the number of J-20s than what we have to work with now.
Hopefully they continue with this new numbering system for future new aircraft.