Estimate of Hull-Weight Change with Varying Length-Beam Ratio for Flying Boats Page: 2 of 11
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NACA RM No. L7F24ul t
3 1176 01436 3536
NATIONAL ADVISORY COMMITTEE FOR AERONAUTICS
ESTIMATE OF EULL-WEIGBT CHANGE WITH VARYING LENGTH-BEAM
RATIO FOR FLYING BOATS
By Stanley U. Bencoter
A study has been made of the variation of seaplane hull weight
with length-beam ratio in a systematic series of hulls designed for
constant gross weight and similar spray characteristics. It is
found that increases in the length-beam ratio bring about small
reductions in the hull weight if it is assumed that seaplanes having
the same weight and bottom shape will be designed for the same load
factor. A short discussion is also given to show the reduction in
load factor that may occur with high length-beam ratios.
A rough estimate has been made of the change in structural
weight of the hull of a flying boat when the length-beam ratio
varies from 6 to 15. The seaplane has been considered to have
a gross weight of 65,000 pounds. The estimate has been prepared
by considering loading conditions in landing, primarily. In
preparing the weight estimate it has been assumed that the same
maximum load factor would be used in the design of the seaplane
for all length-beam ratios. A study is also included to show the
reduction in maximum landing acceleration that occurs with increased
length-beam ratio. The design is considered on the basis of the
most recent Navy Department specifications.
Ah horizontal area of forebody
C, beam loading coefficient
H height of hall
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Benscoter, Stanley U. Estimate of Hull-Weight Change with Varying Length-Beam Ratio for Flying Boats, report, August 14, 1947; (digital.library.unt.edu/ark:/67531/metadc58073/m1/2/: accessed September 23, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.