Question about octane fuel requirements for DB601A and DB601N engines for the Bf109E

[Larry Hickey]

Hello,

My understanding is that a Bf109E-4 (or any other E subtype) with an 87 in the octane fuel triangle below the fuselage fuel fill point indicated that the a/c had a standard DB601A engine. Whereas for the plane to be equipped with an upgraded DB601N engine it would have been indicated by a "100" for the octane rating in the fuel triangle. I know that the DB601N became standard for the "F" subtype, but I know that some 109Es also carried this more powerful engine and were thus designated as Bf109E-4/N subtypes.Do I understand this correctly?

Regards,

Larry Hickey
EoE Project Coordinator