[klemchen]

Hello,

it is generally agreed that the DB 601 N-powered F-1/F-2 had a prop of type 9-11207 A and the DB 601 E-powered F-3/F-4 one of type 9-12010 A (except some late F-4s which had the 9-12087 A of most Gs). Now I can easily tell a prop of the two F first types from a 9-12087 A and a 9-12159 A, and also each latter type from the other one on photos, but I have never been able to detect any optical difference between the two F props. Was there any diifference between the blades of these two, or did they have the same blades and differed only by their gears for changing pitch or by some other device?

Best regards,
klemchen