Research in annular lift fan aircraft: high hovering efficiency (9.03 lbs/hp) on almost tripled disk loading (28 lbs/ft2) of helicopters, high top cruise speed 0.7 Mach on thrust to weight ratio of 0.7http://www.mdpi.com/2226-4310/4/1/13
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March 3, 2017 at 2:23 pm