A review of NACA research through 1954 on boron compounds as fuels for jet aircraft (Project Zip) Page: 2 of 42
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SUNCLASSIFIED ,,
NACA RM E55B01 3 1176 01435 8049
NATIONAL ADVISORY COMMITTEE FR AERONAUTICS
RESEARCH MEMORANDUM
A REVIEW OF NACA RESEARCH THROUGH 1954 ON BORON COMPOUNDS AS
FUELS FOR JET AIRCRAFT (PROJECT ZP)
By Walter T. Olson, Roland Breitwieser, and Louis C. Gibbons
SUMMARY
This report reviews NACA work through 1954 on a project of the Bureau
of Aeronautics, Department of the Navy, seeking a high-energy fuel suit-
able for turbojet-powered aircraft. This work includes thermal and com-
bustion properties, experiments with combustors designed to use boron
compounds, evaluation of boron fuels in full-scale turbojets with and
without afterburners, and ram-jet flights on boron fuels. Satisfactory
combustion of pentaborane has been demonstrated in a turbojet, an after-
burner, and a ram jet. The anticipated reductions in specific fuel con-
S sumption have generally been obtained. Total running times have been
quite brief.
INTRODUCTION
The intention of this report is to review NACA participation in
ProJecEfipf, a Bureau of Aeronautics, Department of the Navy project
on high-energy fuels for aircraft. Project Zip itself is a search for
a turbojet fuel with a heating value at least 30 percent higher than
current jet fuels. This fuel should have chemical, physical, and toxi-
cological properties that make it applicable to aircraft. Prime con-
tracts from the Navy to two chemical companies are intended to develop
a suitable fuel and methods of producing it economically. The most
promising candidate fuels in Project Zip, to date, are boron compounds.
The original purposes of NACA participation in Project Zip were,
first, to assist in the measurement of properties, especially thermal
and combustion properties, of candidate fuels for Project Zip, and
second, to demonstrate principles for the design of turbojet combustors
for high combustion efficiency, good outlet-temperature profile, and
minimum boron oxide deposits. Later, two items were added: evaluation
of boron fuels in full-scale turbojet engines including afterburners,
and ram-jet flights on boron fuels.
UNCLASSIFIED
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Olson, Walter T.; Breitwieser, Roland & Gibbons, Louis C. A review of NACA research through 1954 on boron compounds as fuels for jet aircraft (Project Zip), report, April 12, 1957; (https://digital.library.unt.edu/ark:/67531/metadc64502/m1/2/: accessed April 25, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.