A unique “helipod” single-place helicopter design uses a shroud-ring to completely enclose coaxial short-span rotors. The shroud serves to shield counter-rotating blades to overcome lift dissymmetry and increase rotor efficiency. Helipod Inc. of California, which plans to build the ship in Japan, calls it a “shielding rotating wing biplane” and says the prototype will fly this summer. A supersonic transport model built by Lufthansa may indicate future SST designs — it closely matches ...

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