AVIATION: Triumph of the Egg Beater

"The helicopter is in its babyhood," said Igor Sikorsky last week. "It's not much beyond the airplane in the Kitty Hawk days." But even Sikorsky, who is the father of all U.S. helicopters, is amazed at how fast his baby is growing. Last week the Sikorsky Aircraft Division of United Aircraft Corp. announced it will increase its factory floor space by one-third to 500,000 sq. ft. The Civil Aeronautics Administration approved' Sikorsky's new, fast (111 m.p.h.), four-place YH-18; the armed services jammed his production lines with orders for the older and bigger...