Estimate of Hull-Weight Change with Varying Length-Beam Ratio for Flying Boats Page: 7 of 11
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NACA RM No. L7F24
The percentage of hull weight represented by each component has been
assumed to be approximately equal to the values of these quantities of
the X-BS-1 model airplane. These percentages of weight are assumed to
be applicable to the model having = 6. These values are shown in the
second column uf the following table:5.24
9.209
1.67
3.57
5.10
5.16
10.98
7,86
3.68Total 62.5 56.54 54.60 54.07
By means of the relative weight factors, the percentage of hull weight in
the various components has been computed to be as shown in the remaining
columns of.the foregoing table. The sum of the second column of the
foregoing table indicates that the 10 components being considered represent
62,5 percent of the total structural weight of the hull. The differences
between the total values show represent percentage hull-weight changes.
WEIGHT REDUCTIONS
It is also of some interest to determine the percentage reduction in
airplane structural weight and the percentage reduction in gross weight
brought about by using high length-beam ratios. The ratio of hull weight
to gross weight for five flying boats is shown in the following table:
Flying boat Bull weight Structural weight
Gross weight Gross weight
PB'Y-5 0 095 0.292
PB2Y . .107 .318
XPBS.- .130 c318
Lerwick .126 .325
Sunderland .153 .349
Average .122 .3206o6
7a3
2.4
4.5
2,9
3.7
1,7
15.6
12.5
5.35.76
8,33
1,94
3.93
4.48
1. 94
12.33
9.52
4.286
1
2
3
4
5
6
7
8
9
104,85
9,89
1,49
6.12
5,74
2.30
0.7930
6.79
3.28
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Benscoter, Stanley U. Estimate of Hull-Weight Change with Varying Length-Beam Ratio for Flying Boats, report, August 14, 1947; (https://digital.library.unt.edu/ark:/67531/metadc58073/m1/7/: accessed April 24, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.