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#1 A small rotor is operating at high rpm and or pitch with a high downwash velocity, #2 or a larger rotor is operating at lower rpm with lower downwash velocity. So the answer from my book is the rotor with greater induced velocity will require the most horsepower. since the larger rotor blade creates less downwash velocity does that mean it creates less induced velocity? So in practical terms what's more efficient a UH 1 high aspect ratio or small narrow rotors with greater numbers like an MD500. Note that this is not stuff required for the FAA exam, just additional knowledge. The FAA stuff doesn't get too nitty gritty on aerodynamics. The FAA book doesn't cover this
Just found out about this interesting Chinese variant of the MQ-8 Fire scout UAV helicopter, one thing I notice is the strange rotorhub. Anybody have any details on this interesting helo? Look closely at the MQ-8 Fire scout compared to the Chinese SVU-200 Rotor hub design, if you look closely it has no pitch links, I think they're hidden inside the shaft, like the swiss marenco helicopter. Very interesting
So I'm interested in learning more about rotor head/hub design so I did some searching and I find that most helicopter books only discuss aerodynamics, this is not really useful for me. I'm looking more specifically for an engineering book that discuss rotor head design. Why is there so little published on helicopter engineering? So far the only book I've found is helicopter design and data manual by Stanley J Dzik which according to the description has a chapter on rotor hub design. My main interest is learning more about swashplateless rotor hubs, Like these below. https://www.google.ch/patents/US20090269199 https://dspace-erf.nlr.nl/xmlui/bitstream/handle/20.500.11881/1109/FM08.pdf?sequence=1&isAllowed=y Maybe ichris should write a book
If anyone has been paying attention the new Airbus H160 you will notice is has double horizontal stabilizers. I am pretty sure this is a new design as I've never seen it done before. Just curious about the aerodynamic advantages if any?