cape ity
The
jointly tn
responses
for cubits delivery tactics cudd be vied.
Movy =,on ured a project in which two AtD-1 alms ft poatioiy. ted
several shots {n order to incasure weapon in-puts aad structural
to high yield weapons. The final objective was the correlation of
the data with that of the Plumbbob tests In order to define the high yield
(megaton range) weapon delivery capability of the A4D-1. From the preliminary data obtained it was determined that measured stresses were consistent
with predictions obtained from the analytical techniques employed. It is an-
ticipated that additional data obtained from wing pressure instrumentation
will assist in further refining the dynamic analysis. Thermal inputs were
generally substantially lower than predicted, although the temperature response
calculatfons based upon measured inputs in general showed good correlation.
It was concluded that the data obtained, when combined with that obtained
from Operation Plumbbob and the aircraft performance characteristics, will
permit the definition of the nuclear weapon delivery capability of the A4D-1
aircraft,
Effects input and structural response of two FJ-4 aircraft were measured, The information obtained was concentrated in inputs and effects from
higher ylelds in order to correlate with data obtained from the lower yields
of Plumbbob and confirm the Class D delivery capability of the aircraft.
In general, excellent correlation of blast response data was obtained, veri-
fying the dynamic analysis techniques used for predicting structural responses.
It was concluded that response data have been obtained over a sufficiently
wide range of yields and incidence angles to permit subsequent definition of
the Class D delivery capability of the FJ-4B aircraft.
Program 6, Test of Service Equipment and Materials
This program had a wide range of project station locations: Wake Island and Eniwetok, Bikini, Kwajalein, Kusaie, Wotho, and Rongelap Atolls,
One project to study the wave form of electromagnetic pulse from a
nuclear detonation used two sites: Kusaie, 420 miles from Eniwetok, and
Wotho, 240 miles from Eniwetok. The objective was to make broad-band
measurements from 0 to 10 Mc at ranges up to 460 miles. The measurements were not expected to be radically new. Although improvements in
equipment were incorporated, the primary concern of this project was to
incréase the cataloging of wave forms.
The data, which are in good agree-
ment with those obtained during Operation Redwing, indicate
(oe ee
»
Ancther project, with stations at Wake Island and Kusaie, studied ionospheric effects of large-yield surface detonations. In agreement with results of Operation Redwing Project 6.3, the energy responsible for the first
disturbance in the ionosphere above Kusaie was propagated with a mean
velocity of 20 km/min. Also corroborating previous results, the second
disturbance resulted from energy propagated with a mean velocity of about
13 km/min. The first effect has been postulated to be due to a compressional wave and the second to a hydromagnetic wave. The fact that the
first effect was seen approaching but not receding is indicative of the shape
of the ion-density variation associated with the disturbance.
Two projects participated during shot Umbrella to obtain effects data
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AF wu HO
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