True, Kev, there were many more L.III's.
And since they do seem to perform like IX's at low alts and like the V at higher alts, and a little worse, I assume, at yet higher alts, it does seem to add more colour to the Spitfire line.
I still wonder, though, why it seems so slow and it only climbs over 4000 fpm under 6000' with the Merlin 55M, while the Merlin 45M allowed the Spitfire LF.V to climb over 4000 fpm till 8,800'.
Why'd they stick a Merlin 55M if the 45M had much better performance? Is the weight increase just THAT bad? OR are the commonly published results just wrong/misleading?