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Modern What if: Turboprop before Turbojet in 1939?

HeavyArmor

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In late 1929, just as then-Pilot Officer Frank Whittle submitted his idea of a "Turbine-engine" to the Air Ministry.

But under the subtle influence of B.O.B. (Bored Omnipotent Being), the Air Ministry takes significant interest in Frank Whittle's concept, and resource are diverted to help develop it into a workable project.

Before long, the Frank Whittle's original concept would evolve into the Turboprop engine.

Rolls-Royce are brought in to help the development, and significant resources were poured into this endeavor.

Thus by early 1937, the British team had beaten the Hungarians at creating the first workable Turboprop. In late 1938, the first purpose-designed Turboprop were created by Rolls-Royce.

In early 1939, the RAF (again influenced by B.O.B.) starts acquiring new airframes that are redesigned to mount the Turboprops.

The Bristol Blenheim is the first to undergo such modifications, and by August 1939, 100 Turboprop-powered Blenheim are working alongside her Piston-powered cousins. The production of Turboprop Blenheim maintains at 4 aircrafts per day.

The first generation Turboprop would be 15% lighter, yet 15% more power than comparable Piston engine designs (resulting a ~35% increase in power-to-weight ratio), these Turboprops have 60% the lifespan and reliability of comparable Piston engines, but consume 20% more fuel.

How would this have affected the development of aircrafts in 1940's~1950's era? and how mouch would it have affected the World War II?
 

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