[Juha]

Hello
while trying without luck to find out info on the crunch and possible problems with the early one from Smith's Stuka book I noticed that according to the book R-2 didn't have the extra two 150 l fuel tanks inside outer wings like R-1, so R-2's internal fuel capacity was same as B-2s. So there were three max ranges, B-2, R-1 and R-2 all had different max range and if B-1's weaker engine was less thirsty than that of in B-2/R-2 then we had 4th max range.
And of those Stukas which attacked HMS Illustrious, those from I/StG 1 were Rs and those from II/StG 2 were Bs.

Juha