UPPER AIR ROCKET SUMMARY                                                                       V-2
                                                                                                                           NO. 39
IDENTIFICATION                                                                                19 March 1948

    Time of firing: 1610 MST
    Agency: General Electric Company
    Altitude: 3.4 miles

UPPER AIR INSTRUMENTS

    Temperature: Flash and sound grenades to obtain anomalous propagation of sound
        data (SCEL)
    Composition: Air sampling bottles in "Blossom" canister. (Michigan U.)
    Other: Upper air wind vectors from drift of grenades puffs and talcum "smoke"
        generator (SCEL)
        Earth's magnetic field (ARDC)

DATA RECOVERY INSTRUMENTS

    Telemeter: G. E. PWM/FM, 28-channel system (production model)
    Physical recovery: Warhead separation explosives in control chamber. "Blossom"
        canister containing air-sample bottles.

BALLISTIC INSTRUMENTS

    Firing Range
        Theodolites: Two Mitchell and eight Askania stations
        Cameras: Three Bowen-Knapp stations
        Telescopes: Three stations
        Radar: Two modified SCR-584 S-band stations
        Doppler: Four stations

    Airborne
        Beacon: AN/APN-55 S-band transponder
        Doppler: Dovap transceiver
        Radio cutoff: One ARW-17 receiver for command fuel cutoff and blowoff
        Aspect: Three heliographs in tail fins
        Other: Vibration sensitive yaw and pitch accelerometers
           Velocity meter (gyroscopic integrating accelerometer)

ROCKET INFORMATION

    Payload weight: 2200 lb
    Unfueled rocket weight: 9659 lb
    Gross weight at takeoff: 29,074 lb

ROCKET PERFORMANCE

    Firing angle: 0.0 degrees true
    Program angle: 7.0 degrees from vertical
    Time to burnout: 28.5 sec.
    Velocity at burnout: 530 ft/sec
    Time to zenith: 54.3 sec
    Altitude at zenith: 3.4 miles
    Time to tail blowoff: 65.2 sec (explosion)
    Altitude to tail blowoff: 2.5 miles
    Flight duration: 91.5 sec
    Impact coordinates: 1 mi. south and 1/2 mi. east

BALLISTIC DATA

    Theodolites: Askania and Mitchell tracked rocket and "Blossom" to impact
    Cameras: Satisfactory operations
    Telescopes: Satisfactory operations
    Radar: Complete flight record
    Doppler: Readable signals at two stations
    Vibration: Instrument section yaw and pitch plane vibrations (40 cps max.)
        negligible magnitude
    Other: Rocket velocity measured to reasonable order of accuracy with precessing
        gyro

DATA RECOVERY

    Telemeter: Crosstalk between three channels, satisfactory otherwise
    Physical recovery: Heliographs, "Blossom" parachute, and canister recovered.
        Pilot parachute not recovered.

EXPERIMENTAL DATA

    Low altitude flight prevented any experimental data recovery

COMMENTS

    Rocket modifications: "Blossom" ejector mechanism
    Rocket performance: Early burnout due to low pressure air failure probably caused
        by regulator malfunction
    Experiments: talcum generator produced satisfactory "smoke" trails at low altitude
    Other: Blossom ejection satisfactory at low altitudes

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