Time of firing: 1215 MST
    Agency: General Electric Company
    Altitude: 97.0 miles

UPPER AIR INSTRUMENTS

    Density-pressure-temperature: Skin temperature measurement equipment at six
        locations on specially constructed nose cone and also on instrument compart-
        ment door. Absolute pressure gage for measuring pressure
    Composition: Three air sampling bottles in the opening and closing devices (U. of
        Michigan)
    Solar radiation: Ultraviolet spectrograph (NRL)

ROCKET PERFORMANCE INSTRUMENTS

    Special plated and polished nose cone, with imbedded thermistors for measuring
        skin temperatures, ws attached to missile

DATA RECOVERY INSTRUMENTS

    Telemeter: 28-channel General Electric PWM-FM telemetry system
    Physical recovery: Separation of nose section with TNT and primer cord

BALLISTIC INSTRUMENTS

    Firing Range
        Theodolites: Two Mitchell and three Askania stations
        Cameras: Two ballistic stations and more than one Bowen-Knapp station
        Telescopes: At least two stations
        Radar: Two modified SCR-584 S-band stations
        Doppler: Locations not given

    Airborne
        Beacon: Modified AN/APN-55 S-band transponder
        Doppler: Dovap transceiver
        Radio Cutoff: Two ARW-17 control receivers for command fuel cutoff and
            recovery
        Other: Rocket propulsion and control performance instruments (G. E.)

ROCKET INFORMATION

    Payload weight: 2200 lb
    Unfueled rocket weight: 9107 lb
    Unfueled rocket C. G.: 240.1 in.
    Gross weight at takeoff: 28,772 lb

ROCKET PERFORMANCE

    Firing angle: 0 degrees
    Program angle: Seven degrees
    Altitude at burnout: 120,000 ft
    Time to burnout: 63.5 sec
    Velocity at burnout: 5020 ft/sec
    Altitude at zenith: 97.0 miles
    Time to tail blowoff: 84.5 sec
    Altitude at tail blowoff" 232,000 ft
    Impact coordinates: 27.5 mi. north, 16.5 mi. east

BALLISTIC DATA

    Theodolites: Operation satisfactory
    Cameras: Satisfactory Bowen-Knapp operation
    Telescopes: Operation satisfactory
    Radar: Operated satisfactorily to 84.4 sec
    Doppler: Operated satisfactorily to 84.4 sec

DATA RECOVERY

    Telemeter: Solid signals received for 64 sec, except for a one-half sec break.
        Modulation disappeared at 64 sec and unmodulated signal continued until 84 sec
        at time of warhead blowoff
    Physical recovery: One air-sampling bottle recovered. Spectrograph recovered in
        near-perfect condition.

EXPERIMENTAL DATA

    Excellent records obtained from temperature measuring equipment for period
        covered by telemetry records.
    Pressure gage functioned normally during period covered by telemetry records, and
        excellent records were obtained.
    Solar radiation spectrograms obtained before blowoff extended down to 2600A;
        although of good quality, not much was added to data obtained previously.
    Very significant supersonic heat transfer data obtained as result of temperature
        instrumentation.

COMMENTS

    Rocket performance: First 50 sec of flight entirely normal. At this time missile
        turned sharply to the left, reaching and holding a course approximately 30
        degrees from the original heading. There was an internal explosion at 83.5 sec.
    Other: No clues as to reason for premature warhead blowoff

REPORTS AND PAPERS

    Report on A-4 Missile No. 27, Including Skin Temperature Measurements to Mach
        No. 5, R. P. Haviland, General Electric Report No. 55256, 22 April 1948
    Supersonic Convection Heat Transfer Correlation from Skin Temperature Measure-
        ments on a V-2 in Flight, General Engineering Lab, General Electric Company,
        21 June 1948
    Atmospheric Temperature and Pressure Variation with Altitude for Flight of A-4
        Missile No. 27, W. W. Fischer, TR 55257
    Supersonic Convection Heat Transfer Correlation from Skin Temperature Meas-
        urements During Flights of V-2 Rockets No. 27 and No. 19, W. W. Fischer,
        G. E. Report 55258, July 1949