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Update As @Zeus has pointed out correctly: Drag coefficient stay constant in my scenario, not drag -- I've updated the explanation accordingly. Sorry for that blunder. The conclusion does not change: Engines with constant PSFC only have an advantage when flying slowly and get worse much quicker than engines with constant TSFC -- but actual engines are mostly ...


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I can't offer the technical backup, but years ago, I read that if the props are designed to run at slightly different rpms, it reduces the otherwise-hellacious sound produced by the contra props. Noise has been an issue with these since engineers started using them (late WWII I think). Of course, none of the NK-12 powered aircraft are known to be "...


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According to this ATSB Australia Report, the Original Blade Weight of the Trent 800 Blade that failed was 11.6KG. The weight of the blade in grammes is etched into the blade root. https://www.atsb.gov.au/media/33974/tr200100445_001.pdf Page 9/10. Fan Blades of the same type all differ (slightly) in weight and are chosen specially to balance the engine when ...


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