Vacuum-Air Tube System for Low Altitude Meteorological Probes.
Interim technical rept. no. 7,
ARMY RESEARCH OFFICE DURHAM N C
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The vacuum-air missile boost system for launching meteorological probes for low altitudes was recommended. The maximum velocity that can be imparted by this system is near sonic velocity. The instrument payload comes down with a parachute and transmits the data to a ground station on its descent. This system is considered quite suitable for launching low altitude meteorological probes up to 8,000 feet height. Its advantages over the presently used methods are low g acceleration of the instrument payload, speedy data collection, low cost per launch, all weather operation capability, launch without recoil without flash or without any noticeable sound. Three specific design plans for permanent, temporary and mobile facilities and design charts for 12 to 3 lb. payloads, 3 to 150 ft. long and 3 to 9 in. diameter tubes and for 1,000 to 8,000 height ranges are given. The minimum time required for data collection is expected to be 1 to 3.2 minutes for 2 to 7 thousand ft. altitudes assuming a rate of descent of 40 ftsec. for the parachute. Author