[sentinel]

Regarding FM's, as I see it it really is a matter of feeding in data such as weight wing area thrust, air density, ceiling, max and min (stall) speeds and using programs to calculate the graphs generated from the imput. In the case of WWI aircraft there are no superchargers to contend with until right at the end of the war......and those were'nt really superchargers. Some aircraft probably would not fit the data entierly because of the effect of the rotary engines and all the mass being at the front of the machine such as the Camel. But generally you would get a pretty accurate output. I know because I spent many years researching into bird flight and so I know it can be done. One must avoid anecdotal evidence like the plague though.
Regards,
Sentinel.