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@Velocio
Just stumbled upon a killer lecture: http://www.aerosociety.com/Events/Event-List/1754/The-History-of-the-RollsRoyce-RB21122-Turbofan-Engine
And it's free.
Basically, this was the most advanced engine in the world when it was developed, and it bankrupted Rolls Royce which forced nationalisation and the intervention of the UK and US government. It eventually became one of the world's most reliable engines and transformed intercontinental air travel.
And this is a free lecture by a former director of engineering for Rolls Royce.
Can't argue with free + interesting.