[Evgeny Velichko]

Sjonnie:

"Original" C-7's had the same engine as C-1/2/4 and all D-0/1/2/3 - DB601A.

But they were able to carry SC1000, 2 x SC500 e.t.c. even with that engines in 1940.

After winter 40/41, many weared / old C-2/4 were "upgraded" in repair stations to "E" standart, and renamed C-7 in most documents. Upgrades were different from rep. station to station, and from a/c to a/c. Main were:
-Armored windglass of pilot
-Pilot armor plate
-DB601N
-Underwing bombracks
-scissors on tailwheel.
-equip,ent, like Pitot tubes e.t.c.
-some little other (trim plates e.t.c.)

So, Bf110C-7 of "1940" and Bf110C-7 "of 1941" are very different aircrafts.