[ACE-OF-ACES]

No problem! Yeah, it's just the same engine type that's certain...of course we're told that it's from a report that uses the standard Bf-109K4's performance as a baseline and calculates the improvement from a new prop, so that's something at least. The differences between the DB and DC seem to be simply that the DC can use C3 fuel so is later cleared for 1.98ata, and it has slightly worse performance at SL and slightly better performance at altitude.

One more question

What is the signicants of the '5026/ 28' listed in the mid right hand side of that rate of climb chart?