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Production Vanguard satellite (SLV-2) failed to orbit due to failure of second stage, but demonstrated structural integrity of tankage which with, stood pressure exceeding design values.

EXPLORER III reentered the earth's atmosphere.

The National Advisory Committee for Aeronautics NACA reported that 50 percent of its research effort was being devoted to problems associated with missiles and space vehicles.

USAF revealed that an airflow speed of 32,400 mph had been attained for one-tenth of a second in a wind tunnel test at the Arnold Engineering Development Center , Tullahoma, Tenn., on an undisclosed date.

Dr. Herbert F. York was appointed as Chief Scientist for DOD's Advanced Research Projects Agency.

First U.S. full-size tactical nose cone was recovered from the Atlantic Ocean 4½ hours after launching from Cape Canaveral on a Jupiter missile Jupiter missile.

Plastic balloon flight No. 1,900 launched by the Balloon Branch of the Missile Development Center at Holloman AFB , a series beginning in July 1950.

Kurt Stehling speaking to the Institute of Electrical Engineers says that a pilot moving around inside a spacecraft could cause navigational problems. The solution needed is an effective gyroscope. ''New York Times Apr 19''

H. Julian Allen of National Advisory Committee for Aeronautics NACA Ames Laboratory conceived the "blunt nose principle" which submitted that a blunt shape would absorb only one-half of 1 percent of the heat generated by the reentry of a body into the earth's atmosphere. This principle was later significant to ICBM nose cone and the Mercury capsule development.

Six U.S. Navy enlisted men began an 8-day experiment in a simulated space cabin at the Air Crew Equipment Laboratory of the Naval Air Material Center at the Philadelphia Naval Base. NASA authorized $150,000 for Army Ordnance Missile Command studies of a lunar exploration program based on Saturn-boosted systems. To be included were circumlunar vehicles, unmanned and manned; close Lunar Orbiter ...

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