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#3
April 18th 05, 09:53 PM
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The Advancing Blade Concept may make a comeback. The S-69/XH-59 with
stacked co-axial rotors was hampered by empty weight and hub drag. Today's improvements in composite materials, fly-by-wire controls, and transmissions may make the ABC viable for higher-speed applications. Sikorsky is again showing ABC concepts, so . . . The telescoping tilt rotor idea is still around, but I somehow see that less likely than the ABC. HW 
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