I'm considering Kaiserreich-esque Alt Hist timeline where Canada + a bunch of British exile engineers have to build aero engines -- for speed of development, reliability, and simplicity they just develop the Bristol Mercury/Pegasus, avoid sleeve valves and stick with poppet valves, and also go...
air ministry
bristolaeroenginesbristolaeroplane company
bristol aircraft
british army
cold war
great britain
royal air force
royal aircraft establishment
supersonic transport
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