I'm sorry to correct you joegerardi-1 ..but the control surfaces of the Avro Lancaster were most definitely NOT fabric covered! Not in initial design drawings, prototypes, or any of the various marks assembled during its production life. That goes for the Avro Manchester as well, which morphed into the Lancaster after its Rolls
Royce Vulture engines proved to be unreliable in every respect. The designer, Roy Chadwick, would never have sanctioned such a lash up on a heavy bomber, had he not stipulated aluminium, the brass at AVRO would have done it for him! No aircraft of this type could have flown with fabric ailerons, rudder etc. The controls at that time had no hydraulic assistance, Guy Gibson himself wrote that; "you have to be quite strong to fly a Lancaster." Altering the angle of alloy ailerons at 240mph was hard enough, the drag on fabric would have made it impossible!
Even the plywood and fabric De Havilland Mosquito had aluminium rudder and ailerons.
Not only did it lighten the controls, it didn't 'balloon' in flight as fabric could (and did!) thus lessening the chance of structural failure in the air. (which in a bomber usually meant "goodnight nurse..blow out the candles!")
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