Agency: Naval Research Laboratory
    Time: 1102 MST
    Altitude: 108.0 miles

UPPER AIR INSTRUMENTS

    Cosmic radiation: Geiger counter telescope
    Solar radiation: Solar ultra-violet spectrograph
    Pressure-temperature: Ambient pressure gages on nose tip, nose cone, control chamber,
        and between fins on tail section
    Pressure gages on tail section ahead of fins
    Ionosphere: Indirect ion density measurements by radio propagation experiment
    Other: Selected Seeds (Harvard College)
        Cross jet attenuation transmitter and receiver

DATA RECOVERY INSTRUMENTS

    Telemeter: NRL 21 channel PPM/AM system
    Airborne recorder: NRL 10 channel neon lamp camera recorder
    Physical recovery: Warhead separation explosives in control chamber,
        NRL spring ejected block with parachute and drag plates,
        Daughter recovery device (U. S. Army).

BALLISTIC INSTRUMENTS

    Firing Range
        Theodolites: Two Mitchell and six Askania stations
        Cameras: Three Bowen-Knapp stations
        Telescopes: One station
        Radar: Modified SCR-584, S-Band station
        Doppler: Four stations.

    Airborne
        Beacon: AN/APN-55, (XE-2), S-Band transponder
        Doppler: DOVAP transceiver
        Radio Cutoff: AN/ARW-17 FM control receiver for command fuel cutoff
        Other: Routine rocket performance instruments. (G. E. Co.).

ROCKET PERFORMANCE

    Firing angle: 0.0 degrees
    Program angle: 4.7 degrees
    Time to burnout: 67.7 sec.
    Velocity at burnout: 5350 ft. per sec.
    Altitude at burnout: 25 miles (approx.)
    Time to zenith: 227 sec.
    Altitude to zenith: 108 miles
    Time to blowoff: 335 sec.
    Altitude at blowoff: 22 miles
    Flight duration: 412 sec. (rocket breakup)
    Impact Coordinates: 12 miles north, 5.0 miles east
    Payload weight: 2200 lbs. (approx.)
    Unfueled rocket weight: 9,164 lbs.
    Unfueled rocket C.G.: 236.2 inches
    Gross weight at takeoff: 28,959 lbs.

BALLISTIC DATA

    Theodolites: Records incomplete or irreducible
    Cameras: Records incomplete or irreducible
    Telescope: Satisfactory reducible record
    Radar: Satisfactory reducible record
    Doppler: Records incomplete or irreducible
    Impact location: Air and ground search

DATA RECOVERY

    Telemeter: Station 1 failed at 60 sec. Station 2 record complete but for several short
        intervals. Probably caused by poor rocket aspect.
    Physical recovery: NRL ejection device not recovered. Warhead not recovered.
        Daughter recovery device not recovered until 22 Dec. 1947
        Solar spectrograph recovered in excellent condition.
    Airborne recorder: Located in ejection block, never recovered.

EXPERIMENTAL DATA

    Cosmic radiation: Telescope counting rate in free space (less than 2 mm. Hg pressure)
        one third of maximum rate. Penetrating component 70% of total radiation.
        Shower rate high.
    Pressure: Pressure measurements to 90 km conform closely with NACA standard and
        Harvard College Observatory data.
    Skin temperature: 600 C rise on 0.3 mm cone at nose tip, 35 rise at bottom or warhead
        to 60 rise 24 in. behind nose tip (skin 0.8 to 11 mm. thick cone angle 17 degrees).
        230 C temperature rise on 0.5 mm control chamber skin, Skin temperature rose to
        45 C at 40 sec, end fell to -80 C after 100 sec.
    Solar radiation: Solar spectrograms to 88 km down to 2260 Angstroms.
    Ionosphere: No data from propagation experiment due to antenna failure.

COMMENTS

    Rocket performance: Propulsion and control performance very good.
    Unusual rocket modifications: Solar spectrograph house in fairing on a tail fin, duplicate
        dummy housing on opposite fin.
    Ballistic tracking: Very poor results, altitude of rocket obtained from pressure data.
    Physical recovery: Tail section installation of recovery items appears to be optimum
        location, warhead locations offer least chance.

REPORTS AND PAPERS

    WSPG Preliminary Firing Report of A-4 Rocket No. 12, Fired 10 October 1946
    "V-2 Report No. 7," Minutes of Meeting of the V-2 Upper Atmosphere Research Panel on
        4 November 1946.
    Review of the Results of the Ballistic Instrumentation Program for V-2 Work, Ballistics
        Research Laboratory, Aberdeen Proving Ground, March 1946.
    "Upper Atmosphere Research Report No. II," by H. E. Newell, Jr. and J. W. Siry, NRL
        Report R-3030, December 1946 (Cosmic Radiation, Solar Radiation, Pressure-
        Temperatures, Ionosphere, Telemetering, Theoretical discussions)
    "Additional Cosmic Ray Measurements with the V-2 Rocket," by S. E. Golian, E. H. Krause,
        and G. J. Perlow, Phys. Rev., 70:776-7, 1946.
    "Solar Ultra-Violet Spectrum to 88 Kilometers, by W. A. Baum, F. S. Johnson, J. J. Oberly,
        C. C. Rockwood, C. V. Strain, and R. Tousey, Phys. Rev. 70:781-2, 1946.
    "Final Report, Project Hermes V-2 Missile Program," by L. D. White, Report
        No. R52A0510, General Electric Company, September 1952.