Agency: Air Research and Development Command
Time: 1116 MST
Altitude: 68.0 miles
UPPER AIR INSTRUMENTS
Pressure-temperature: Ram pressure at nose tip with
ion gage and pressure on cone with four
ion type gages (Univ. of Michigan).
Ionosphere: Vertical incidence propagation transmitters (AFCRC). Bipolar probe measurement
of ion current flow (Univ. of Michigan).
Sky brightness: Photomultiplier tubes with filters (AFCRC).
Biological: Rye seeds, cotton seeds, and fruit flies.
Other: Voltage breakdown measurements (AFCRC).
DATA RECOVERY INSTRUMENTS
Telemeter: PXTA-501 channel NRL PPM/AM system
Physical recovery: Separation of forward portion of rocket with TNT and prima cord. (New
Mexico School of Mines). Blossom, ejection of canister and lowering by parachute
(Cambridge Field Station).
Theodolites: Two Mitchell and six Askania stations
Cameras: Two Ballistic and three Bowen-Knapp stations
Telescopes: One station
Radar: Two modified SCR-584 S-Band stations
Doppler: Four stations
Impact location: None.
Beacon: AN/APN-55, (XE-2), S-Band transponder.
Doppler: DOVAP transceiver
Radio Cutoff: AN/ARW-17 FM control receiver for command fuel cutoff
Aspect: Four AAF K-25 cameras in midsection (WPAFB)
Other: Routine rocket propulsion and control performance instruments. (G. E. Co.).
Time to burnout: 58.0 sec.
Altitude at burnout: 17 miles
Velocity at burnout: 4062 ft. per sec.
Time to zenith: 190 sec.
Altitude at zenith: 68 miles
Time to blowoff: 285 sec.
Altitude at blowoff: 40 miles
Flight duration: 419 sec.
Impact Coordinates: 13.4 miles North and 14.4 miles West
Unfueled rocket weight: 9390 lbs.
Unfueled rocket C. G.: 243.1 inches
Gross weight at takeoff: 28,455 lbs.
Theodolites: Satisfactory Mitchell and Askania operation
Cameras: Satisfactory data from two Ballistic and three Bowen-Knapp stations
Telescopes: Satisfactory images 0 to 100 sec.
Radar: Fair tracking to impact, poor 180 to 240 sec. telemeter interference with beacon
Doppler: Good data 0 to 285 sec.
Telemeter: Good record 0 to 260 sec. intermittent
thereafter from roll
Physical recovery: Nose separation failed, rocket exploded at impact. Parachute recovery
very good. Aspect cameras no recovered.
Ionosphere: Propagation transmitters failed after
burnout, no data. Bipolar probe data in
good agreement with expected electron density values, interpretation of data in doubt.
Pressure-temperature: Pressure data from 55.3 to 66.5 miles. Temperature lower than
Sky brightness: Satisfactory equipment operation, data poor after 40 sec. due to rocket roll
Biological: Seeds recovered and flies still alive.
Voltage breakdown: Data questionable.
Rocket performance: Excellent performance 0 to 27
sec., at this time pitch motion disturbance
occurred. Roll began at 37.4 sec. and increased to 1 r.p.s. by burnout. Combustion
chamber pressure began to drop at 55.5 sec. Jet vane 3 did not operate normally.
Ballistics: Optical instruments hampered by sun's position, haze, and clouds.
REPORTS AND PAPERS
Preliminary Report of V-2 Firing No. 20, ORDBS White
Sands Proving Ground, dated
24 Feb. 1947
Report on A-4 (V-2 Rocket No. 20), Prepared by Physical Science Laboratory, New
Mexico College of Agriculture and Mechanic Arts for Ballistic Research Laboratories, Aberdeen
Telemetering Report, A-4 Rocket No. 20, Prepared by Physical Science Laboratory, New
Mexico College of Agriculture and Mechanic Arts, for Naval Research Laboratory.
"Atmospheric Pressure and Temperature Measurements Between the Altitudes of 40 and 110
Kilometers," Upper Air Research Program Report No. 2, Engineering Research Institute,
University of Michigan, Contract W33-038 ac-14050(15719).
"Upper Air Research Program, Report No. 1, Air Material, Command, Cambridge Field Station,
1 September 1947.
"University of Michigan BiPolar Probe Experiment," Phys. Rev. 76:987, 1949.
"Dynamic Probe Measurements in the Ionosphere," Upper Air Research Program Report No.
3, Engineering Research Institute, University of Michigan.
Report No. 695, by H. P. Hitchcock, Ballistics Research Laboratories, Aberdeen Proving Ground,
"Panel Report No. 20," Minutes of Meeting of the Upper Atmosphere Rocket Research Panel
on 21 April 1949.
"Final Report, Project Hermes V-2 Missile Program," by L. D. White, Report No. R52A0510,
General Electric Company, September 1952.