Erla haube

[Chocks away!]

I've noticed that some late Bf 109s had a thin red line painted diagonaly on their erla haube canopy. Can anyone explain the significance of this line?

 

[KraziKanuK]

It was a reference line when dive bombing, maybe?

Stukas had several lines, one for each angle, on the port side glazing.

 

[Brunner]

Exactly, In 109 it indicated the highest possible angle of dive bombing.