The Avro Type 679 Manchester was designed to meet a 1936 specification for a medium/heavy bomber that could go at high speeds with powered turrets.
After initial flight trials the span was increased by three meters. A fin was added between the tail fins, but this was removed in the Manchester Mk IA.
40% of the Manchesters were lost in operations and 25% in accidents.
The pilot and engineer sat next to each other in the cockpit. There was an astrodome for the navigator to take celestial measurements for navigation.
The nose gunner, also the bomb aimer, sat in a powered turret. Typically during night operations the nose gunner didn't see much combat.
The rear gunner, especially at night, saw the most action and would tell the pilot what evasive action to take when a night fighter was attacking them.
The 24 cylinder X configured engine was basically two Peregrine V-12 blocks attacked to the same crankshaft.
Due to flaws in the airframe and the failure of the Rolls-Royce Vulture engine it wasn't a big success in combat. The Vulture would often overheat.
The engines were down rated to 1,500 HP in the hopes of reducing the overheating.