r
'
+3
Limiting conditions of the aircraft were either one hundred percent
of the design limit allowable bending moment on the horizontal stabili-
zer, or a 400°
F temperature rise on the 0.020 magnesium skin on the ele~
ee
vators.
ies ica
TX the aircraft was positioned at Tize Zero
in a tail~-to aspect for one of the two limiting conditions, whichever
wags critical for the maximum predicted yield of the device concerned.
For NECTAR, the last shot, the aircraft was positioned in a head-on
aspect to obtain figures on bending moments.
This was the first time an
aircraft had been in the "head-on" position at Time Zero.
The maximum useful incremental peak temperature meagured was 250° F
on the 0.020 magnesium skin on the undersurface of the elevator during
YANKEE, the fifth shot.
;
Although considerable damage was done to sheet —
metal, the theoretical overpressure criteria level of 0.80 was attained
safely on BRAVO.
An incremental bending moment on the horizontal stabi-
lizer equalling approximately eighty percent of design load limit vas
the maximum gust load measured.
CASTLE data was sufficient to enable a more accurate determination
of the delivery capabilities of the B-36.
Operational limitations of a manned B~36 in the vicinity of a nuclear detonation were:
1.
Gamma radiation;
2.
Thermal radiation (from the fireball);
3.
Rise of the radioactive cloud;
4.
Overpressure of the shock wave; and
5.
Material velocities following the shock wave.
Project 6.2b was established to extend the work begum on Operation
AFWUKG
S6