Feasibility of Isotopic Power for Manned Lunar Missions. Volume 1. Summary. Page: 51 of 61
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formance. In addition, effort should be expended in the development
of a reliable gas bearing with tests to determine its applicability under
launch load and zero g conditions.
The Dowtherm -A Rankine cycle needs continued development on its
major components but major emphasis should be placed on the design
of a zero g boiling-condensing experiment. Such an experiment should
be performed in orbit and perhaps could use a radioisotope heat source
for the energy required. This experiment should be as simple as pos -
sible, containing only a heat source, a boiler, a condenser and a pump.
The details of this program are outside the scope of this study, but it
is felt that a minimum time would be required to conceive a statement
of work for the Phase I studies recommended.
It is believed that at the end of the development program for these
engine systems, a selection can be made on a much sounder technical
basis than is possible today.
It is recommended that a fuel core be developed that is capable of
withstanding terminal velocity impact at the highest anticipated oper-
ating temperature of the three systems involved. The exact determina-
tion of this temperature cannot be made at this time since the minimum
turbine inlet temperature for the Brayton cycle has not been established.
It is anticipated, however, that a fuel core surface temperature of 17000
to 18000 F would be required. Thus, the fuel core development program
should be directed at this number. The fuel core development must in-
clude a detailed test program which analyzes each phase of missile op-
eration for the Saturn vehicle. Early in this program, a determination
must be made on the safety criteria for this type of fuel capsule. As
stated in the ensuing volumes, the systems investigated have been de-
signed for random impact re-entry. The question of intact re-entry
or burnup re -entry must be resolved. Volume 2 of this series indicates
that from a preliminary analysis either mode of re-entry would be sat-
isfactory for the Apollo trajectory.
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Feasibility of Isotopic Power for Manned Lunar Missions. Volume 1. Summary., report, January 1, 1964; Baltimore, Maryland. (https://digital.library.unt.edu/ark:/67531/metadc1032333/m1/51/: accessed May 24, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.