The prototype of DB3f , that Vladimir Kokkinaki first flied, 21.5 39 , was modified DB-3 , but can you tell us about those differences between IL-4 and DB-3f production aircraft.
Saivila
Hi, sorry for late answer.
Its very wide question:)
If very short -
Il-4 as standart of production series at 1943 was:
Differ engine cowlings
Differ oil system.
Differ exausts
tail cowl made from wood
Pilot pit' fairing made from wood
Some planes have wood nose
Reiforced ribs at rear part of fuselage
Very many differents in the aircraft' equipment
At 1944 production series differs was mach greater:
Differ oil sys
Differ flaps
Differ elevators
Differ equipment
All of it about plane with
streamline wing.