....The -4 required much pondering between productive construction..
Well put! Applies to the -3B, too.
As for the number of rivets, do we have to count the ones drilled out and replaced, too?
Dave
If there are 15,000 in a -7, how many does it take to build a -10?
15,000 X 10/7 = 21,428
Which means the RV14 has 21428 X 14/10 = 29,999.2
After finishing my -4, I learned that its not the time to drive 12,000 (or whatever) rivets, it's not the time drill, de-burr, countersink or dimple 24,000 holes that makes a -4 a big project. It's all about how long it take to determine where to put those holes and working up the nerve to drill that first hole in each row!