From: Iowan in MD/DC
I suggest you load up Tracker and run some days, then go look at the Air Production data set. Filter by R&D and click on an airframe, then click the 'history' button in the middle. This will bring up a chart and it will show you how many points you gained each day.
If you have 4x30 (repaired) R&D factories running, it should increase by 4% per day. If you also have >500 engines in the pool, it should increase by 5% per day. I don't know how many engines are used up to create that bonus point as I've never checked, but you could check your engine usage that turn and subtract those used by airframes produced that turn to arrive at the result.
I am unsure, but can an airframe be advanced by more than 1 month during a month of play time? E.g., if it is 4/42 and a model is set to arrive in 12/42 but you manage to make the R&D hit 100% twice in April, will it advance to 10/42*? One of Chickenboy's posts in the other thread seemed to imply that it could only advance one month per month of game time, but I don't recall reading that anywhere (in truth, I may have forgotten).
*For example, if I have 6 R&D factories at 30 and >500 engines in the pool for all of a given game month, that would be 210 "points" of R&D for that month...