The surface boots were pneumatic, but the boots were removed because they proved to be more problems than not. The bombers rarely flew in icing conditions, as the bomb drop was in visual meteorlogic conditions, as was the formation flights. Damage to the leading edges caused the boots to detach and foul the control surfaces in many instances.
The Air Corps kept the alcohol prop de-ice intact as any ice contamination on the blades caused thrust loss, which may be critical at the large loads that the bombers carried.
_________________ If God had wanted man to fly behind a flat motor, Pratt Whitney would've built one.
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