[Username]

Kristorf, why would they have the trop filter in Murmansk?

Global warming???

Dunno mate, but they did, perhaps they were all that was available at the time, possibly being taken off one convoy for the Med/Far East and moved to Russia.

In much of Russia the summer sunshine converted the muddy quagmires of the spring thaw into dust. If you read 'JG 54' by Held, Trautloft and Ekkehard Bob, Hannes Trautloft makes it clear that one of his abiding memories of Russia was the clouds of red dust which overhung every airfield in the summer months. So, at certain times of the year a trop filter was advantageous. It also gave some protection against carburretor icing in the far north (to which the Merlin engine was prone) by slowing down the air before it entered the carb chamber.