UPPER AIR ROCKET SUMMARY                                                                       V-2
                                                                                                                           NO. 26
IDENTIFICATION                                                                                   15 May 1947

    Time of firing: 1604 MST
    Agency: Naval Research Laboratory
    Altitude: 84 miles

UPPER AIR INSTRUMENTS

    Density-pressure-temperature: Stagnation pressure. Ambient pressures on nose
        cone and tail section.
    Cosmic radiation: Geiger-counter telescope (vertical component of soft radiation)
    Solar radiation: Two solar spectrographs
    Ionosphere: Radio propagation transmitters
    Other: Roll and pitch gyroscopes, K-25 aerial cameras (2), 16-mm GSAP (4)

DATA RECOVERY INSTRUMENTS

    Telemeter: NRL PXTA-501 23-channel pulse sequential system
    Airborne recorder: NRL 8-channel neon lamp film recorder
    Physical recovery: Nose separation by TNT. Tail separation by primer cord.

BALLISTIC INSTRUMENTS

    Firing Range
        Theodolites: Two Mitchell and seven Askania stations
        Cameras: Two ballistic stations
        Telescopes: Two stations
        Radar: Two SCR-584 S-band stations
        Doppler: Four stations

    Airborne
        Beacon: S-band APN-55
        Doppler: In use
        Radio Cutoff: AN/ARW-17 command cutoff and blowoff

ROCKET INFORMATION

    Unfueled rocket weight: 9827 lb
    Unfueled rocket C. G.: 242.5 in.
    Gross weight at takeoff: 29,492 lb

ROCKET PERFORMANCE

    Firing angle: 0.0 degrees
    Time to burnout: 64.2 sec
    Velocity at burnout: 4760 ft/sec
    Altitude at burnout: 114,880 ft
    Altitude at zenith: 84.0 miles

BALLISTIC DATA

    Theodolites: Mitchell - one station tracked 46 sec, the other tracked 200 sec,
        Askania - four stations tracked almost to impact, two stations to 172 sec and
        two stations to 50 sec
    Cameras: Bowen-Knapp - satisfactory operation. Ballistic - images to 5 sec after
        burnout.
    Telescopes: Satisfactory operation, 4.5-in., telescope shows forward part of rocket
        smoking at 70 sec
    Radar: Radar beacon failed after 50 sec, radars tracked to 53 sec
    Doppler: Good signals until 64.2 sec
    Impact location: Visual - air and ground search
 

COMMENTS

    Rocket modifications: Pressurized dome installed over telemeter antenna.
    Rocket performance: Rocket flew off course, 40 degrees east of north from takeoff
        to impact (east of Alamogordo). Explosion in rocket at 64.25 sec while still
        under thrust. Blowoff impossible at this time under normal circuit conditions.
        Warhead was separated during descent and never found. Afterbody in very good
        condition after impact; however, fins did not separate from tank section even
        though primer cord was detonated.

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