And now for the French! Most of the data comes from the escadrille use data in Davilla's French Aircraft of the First World War. The data is somewhat approximate since a lot of escadrilles did not cut over from one type to another on a knife edge, and some of the conversion dates are general such as "summer of 1918". But the shapes and sizes of the curves should be in the ballpark, and it gives us an interesting look at which types were prevalent at each stage of the war. Some planes like the Morane-Saulnier L were sometimes used as fighters, but I have no data on what proportion were used this way instead of as two-seaters.
I left escorts like the Caudron G.6, R.4, and R.11 to the Reconnaissance & Bombers chart, which I will save for a follow-up posting.
Again, if an escadrille was half Plane A and half Plane B, I credited each plane type with half an escadrille, even though it may not have been that even a split. (We will probably never know for sure.) Some planes like the SPAD 13 trickled into escadrilles slowly in ones and twos but do not show up on the chart until a significant portion of a squadron had converted over or (more significantly) had converted from some other type. So it's hard to guess what the front-end of the SPAD 13 curve looked like. Some like the SPAD 12 and 17 were only issued in small numbers, so they do not show up here.
PM me if you're interested in how the curves were derived. I'll spare everyone else the fine details
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