Document Details


Title:
OPERATION HARDTACK, APRIL - OCTOBER 1958, PROJECT 1.10, BLAST OVERPRESSURE FROM VERY-HIGH-ALTITUDE BURSTS ( HARDTACK-I OPERATION ) (DELETED)
Author(s):
PANTALL, J T [AIR FORCE CAMBRIDGE RESEARCH CENTER]; HASKELL, N A [AIR FORCE CAMBRIDGE RESEARCH CENTER]
Subject Terms:
HARDTACK I OPERATION; BLAST EFFECTS; TIME OF ARRIVAL; YUCCA EVENT; MEASURING METHODS; RESEARCH PROGRAMS
Document Location:
Location - NNSA/NSO Nuclear Testing Archive Address - P.O. Box 98521 City - Las Vegas State - NV Zip - 89193-8521 Phone - (702)794-5106 Fax - (702)862-4240 Email - CIC@NV.DOE.GOV
Document Type:
REPORT
Publication Date:
1960 Sep 06
Declassification Status:
Sanitized
Document Pages:
0032
Accession Number:
NV0051386
Document Number(s):
WT1615EX
OpenNet Entry Date:
1994 Aug 26
Description/Abstract:
THE OBJECTIVE WAS THE MEASUREMENT OF TIME OF ARRIVAL, PEAK OVERPRESSUR E VERSUS TIME AT FIVE BALLOON-BORNE CANISTERS SUSPENDED AT VARIOUS DIS TANCES BELOW A DEVICE ( SHOT YUCCA ) DETONATED AT A VERY-HIGH ALTITUDE . IN ORDER TO CIRCUMVENT TELEMETRY BLACKOUT, THE PRESSURE DATA WAS TO BE STORED ON INTERNAL RECORDERS AND THEN PLAYED BACK INTO THE TELEMETE R TRANSMITTERS, AS WELL AS TELEMETERED DIRECTLY. A POWER FAILURE IN TH E RECEIVING STATION JUST BEFORE SHOT TIME RENDERED THE COMMAND TRANSMI TTER INOPERATIVE; IN CONSEQUENCE, THE CANISTER RECORDERS COULD NOT BE TURNED ON, AND NO DELAYED TELEMETERING WAS POSSIBLE. DIRECT TELEMETERI NG WAS BLACKED OUT AT THE THREE CLOSEST CANISTERS AND THE TRANSMITTER IN THE FOURTH HAD NOT RESPONDED TO THE TURN-ON COMMAND SIGNAL BEFORE P OWER FAILURE OCCURRED, BUT A DIRECT TELEMETERING SIGNAL WAS RECEIVED F ROM THE MOST-DISTANT CONISTER. AND APPARENT PRESSURE SIGNAL WAS RECORD ED, BUT THE WAVE FORM WAS ABNORMAL, AND THE TIME OF ARRIVAL AND PEAK O VERPRESSURE APPEARED TO BE MUTUALLY INCONSISTENT. IT IS BELIEVED THAT THE SIGNAL WAS SPURIOUS AND MAY HAVE BEEN PRODUCED BY DAMAGE TO THE CA NISTER. ABOUT 0.3 SECOND AFTER THE ARRIVAL OF THE QUESTIONABLE PRESSUR E SIGNATURE, THE RADIO-FREQUENCY CARRIER FROM THIS CANISTER WAS LOST, AND NO FURTHER DATA WAS OBTAINED. IT IS POSSIBLE THAT THE LOSS OF SIGN AL REPRESENTS THE ACTUAL SHOCK-ARRIVAL TIME.


<< Return to Search Results