it varied greatly, some were fitted with the paddle bladed Nash-Kelvinator propeller which incresed altitude by 1,500ft and cruising speed by 8 mph, but the rotol and hamilton standard needle props were more common.........
That's a heap of information. Would you know what propellers were fitted to the Lancaster's used in 617 Squadron's dam busters raid? Those are the ones I'm trying to find out about. Any clues would be great.