Time of firing: 1535 MST
    Agency: Air Research and Development Command
    Altitude: Approximately 83 miles

UPPER AIR INSTRUMENTS

    Cosmic radiation: Emulsion type sensitive plates for detection of high energy
        particles (U. of Chicago)
    Soft solar x-ray studies: Four packets, each containing photographic film with a
        stepped-wedge type aluminum filter, were placed on surface of warhead
        (AFCRC)
    Skin temperature experiment: Nickel temperature-sensitive elements, commutated
        in one arm of ac resistance bridge, to sense heat change in flush-mounted thin
        steel diaphragms distributed along rocket skin (Boston U.)
    Ambient temperature and pressure measurement: One ionization type pressure
        gage (Mich. U.)
    Pitot tube experiment: Pitot tube located on tip of nose cone for measurement of
        ram and static pressures (Equip. Lab., WPAFB)
    Oblique incidence ionosphere propagation experiment: Gound-trnsmitted signal
        travels over very long path. Receivers both in rocket and on ground. Rocket
        transmitter retransmits signal received in rocket to ground receiver. Measures
        attenuation of wave passing downward through E layer reflected from F layer.
        (Boston U.)
    Sequencing and separation controls: Control equipment to actuate ejection system,
        television and parachute cameras, and antenna switches (FILRAD)
    Data transmission experiment (utilizing telemetering and television techniques):
        Television system for observation of ground from rocket in ascent and portion
        of descent, and observation of opening of parachutes (AFCRC, Boston U., and
        Tufts College)
    Biological experiment: Project Albert II (Aero-Medical Lab., WPAFB)

ROCKET PERFORMANCE INSTRUMENTS

    Photographic studies: Four GSAP type cameras located in parachute compartment,
        one K-17 camera in instrument compartment, one K-25 camera in instrument
        compartment, four GSAP cameras in instrument compartment (Photo Lab.,
        WPAFB)
    Warhead aspect gyros experiment: Two indicators, gyro type J1 modified, one type
        AN/N6 camera, one aircraft clock, lighting system, and mirrors (Photo Lab.,
        WPAFB)
    Beacon triangulation studies: Use of tracking beacon system to obtain trajectory of
        rocket and Blossom; evaluation of system of triangulation (AFCRC and Oklahoma
        A and M College)

DATA RECOVERY INSTRUMENTS

    Telemeter: Ballistic research laboratory telemetering equipment (Hermes)
        operating at 149.22 Mc. Thirty channels.
    Airborne recorder: Universal airborne detector recorder (Cook Research Labo-
        ratories) - 13-channel magnetic tape recorder. Tufts College recorder, 15
        channels.
    Physical recovery: Separation of warhead by radio command to ARW-37 cutoff
        receiver
            Blossom IV-B experiment - New elongated nose section to be separated
        from rocket body and lowered by parachute (FILRAD, Equip. Lab., WPAFB,
        and AFCRC)
            Parachute studies - 100-ft nylon main canopy used in conjunction with a
        32-ft nylon drag parachute (Equip. Lab., WPAFB)

BALLISTIC INSTRUMENTS

    Firing Range
        Theodolites: Two Mitchell and eight Askania stations
        Cameras: Two ballistic and three Bowen-Knapp stations
        Telescopes: Four stations
        Radar: Two S-band stations
        Doppler: Six stations
        Impact location: Impact point computer

    Airborne
        Beacon: AN/DRW-1, S-band beacon
        Doppler: Dovap T-5 missile unit
        Radio Cutoff: One ARW-37 radio receiver operating at 54.5 Mc located in
            control compartment for fuel cutoff and parachute ejection
        Other: Routine rocket performance instrumentation (G. E.)

ROCKET INFORMATION

    Unfueled rocket weight: 10,575 lb
    Gross weight at takeoff: 30,443 lb

ROCKET PERFORMANCE

    Program angle: 10 degrees at 50 sec
    Time to burnout: 67-67.3 sec
    Velocity at burnout: 4412 ft/sec
    Altitude at burnout: 21 miles (approximately)
    Time to zenith: 211 sec
    Altitude at zenith: 83 miles (approximately)
    Time to tail blowoff: 266.3 sec
    Altitude at tail blowoff: 70 miles (approximately)
    Flight duration: 550 sec (estimate)
    Impact coordinates: Main body - 38.53 mi. north, 1.9 mi. west; warhead - 1.91 mi.
        south, 0.03 mi. west of main body; control compartment - scattered over area
        of several square miles south of warhead

BALLISTIC DATA

   Theodolites: Mitchell - images until shortly after burnout; Askania - data reduced
        through burnout
    Cameras: Bowen-Knapp data for first 10-15 sec; ballistic - good images until
        burnout
    Telescopes: Good coverage
    Radar: Beacon signal stopped at 74.5 sec
    Doppler: Good signals until explosion (266.3 sec), record reduced from 62-75 sec

DATA RECOVERY

    Telemeter: Hermes telemetering equipment operated normally and record was
        obtained up to 266 sec, at which time control compartment was blown off
    Physical recovery: Blossom IV-B experiment - ejection system functioned as
        intended
    Parachute studies: Warhead separated from parachute, Blossom nose was blown
        off by the parachute ejection system, and control compartment was blown off by
        TNT charges
    Airborne recorder: Magnetic tape suffered damage upon impact, but upon careful
        reassembly, about an 80% usable record was obtained

EXPERIMENTAL DATA

    Skin temperature experiment: Curves of temperature vs time for heating effects due
        to frictional dissipation between various points on the missile and adjacent air
        molecules, with some gaps due to telemetering
    Oblique incidence ionosphere propagation experiment: Bureau of Standards ground
        transmitter failed, no data
    Ambient temperature and pressure measurements: No results reported
    Mass spectrometer: Oxygen to nitrogen ration equipment failed, no data obtained.
        Helium to argon ration equipment showed 21% change from ground to 83 miles
        altitude, which was not considered significant
    Soft x-ray study: Particle detection experiment, and photographic studies were last
        on impact
    Warhead aspect gyros experiment: Data recorded by camera and all but one film
        pack destroyed upon impact
    Beacon triangulation studies: Only one of the four ground stations received
        synchronization signals from beacon, due to loss of a modulator cable at station
        at Sacramento Peak. One station received excellent signals at all times until
        altitude of 14 miles on downward leg of trajectory.
    Sequencing and separation controls: Controls worked satisfactorily
    Data transmission experiment (by television techniques): Experiment functioned for
        approximately four minutes of flight. Pictures on screen showed cloud formation
        and curvature of earth. Equipment for transmission by telemetering techniques
        functioned for over four minutes of flight.

COMMENTS

    Rocket modifications: This was the second rocket to carry the elongated nose
        section, increasing length of original V-2 by one diameter
    Rocket performance: Takeoff and flight were normal, with rocket propulsion giving
        better than average performance and exceeding calculated performance
    Pitot tube experiment: Good recording of data obtained

REPORTS AND PAPERS

    "Rocket-Borne Television Camera Utilizing the RCA Type 5527 Iconoscope," W. C.
Moore, Part II, Technical Note 7, Upper Atmosphere Research Laboratory,
        Boston University, 4 April 1950