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Assessment of Wingtip Modifications to Increase the Fuel Efficiency of Air Force Aircraft (2007)

Chapter: Appendix A Data Used in Net Present Value Analyses

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Suggested Citation:"Appendix A Data Used in Net Present Value Analyses." National Research Council. 2007. Assessment of Wingtip Modifications to Increase the Fuel Efficiency of Air Force Aircraft. Washington, DC: The National Academies Press. doi: 10.17226/11839.
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Appendixes

Suggested Citation:"Appendix A Data Used in Net Present Value Analyses." National Research Council. 2007. Assessment of Wingtip Modifications to Increase the Fuel Efficiency of Air Force Aircraft. Washington, DC: The National Academies Press. doi: 10.17226/11839.
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Suggested Citation:"Appendix A Data Used in Net Present Value Analyses." National Research Council. 2007. Assessment of Wingtip Modifications to Increase the Fuel Efficiency of Air Force Aircraft. Washington, DC: The National Academies Press. doi: 10.17226/11839.
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Appendix A
Data Used in Net Present Value Analyses

The data values used in the net present value analyses discussed in Chapter 4 are shown in Tables A-1 and A-2.

TABLE A-1 KC-10 Data

Average individual aircraft flight hours per year

783

Average fuel consumption of an individual aircraft (lb/hr)

17,600

Weight of fuel (lb/gal)

6.7

Number of aircraft in inventory in 2007

59

Number of aircraft retired from inventory at start of year

 

2028

6

 

2029

6

 

2030

6

 

2031

6

 

2032

6

 

2033

6

 

2034

6

 

2035

6

 

2036

6

 

2037

5

 

Suggested Citation:"Appendix A Data Used in Net Present Value Analyses." National Research Council. 2007. Assessment of Wingtip Modifications to Increase the Fuel Efficiency of Air Force Aircraft. Washington, DC: The National Academies Press. doi: 10.17226/11839.
×

TABLE A-2 KC-135R/T Data

Average individual aircraft flight hours per year (hr/yr)

425

Average fuel consumption of an individual aircraft (lb/hr)

10,224.2

Weight of fuel (lb/gal)

6.7

Number of aircraft in inventory in 2007

417

Number of aircraft retired from inventory at start of year

 

2018

16

 

2019

17

 

2020

17

 

2021

16

 

2022

17

 

2023

17

 

2024

16

 

2025

17

 

2026

17

 

2027

16

 

2028

17

 

2029

17

 

2030

16

 

2031

17

 

2032

17

 

2033

16

 

2034

17

 

2035

17

 

2036

16

 

2037

17

 

2038

17

 

2039

16

 

2040

17

 

2041

17

 

2042

17

 

Suggested Citation:"Appendix A Data Used in Net Present Value Analyses." National Research Council. 2007. Assessment of Wingtip Modifications to Increase the Fuel Efficiency of Air Force Aircraft. Washington, DC: The National Academies Press. doi: 10.17226/11839.
×
Page 73
Suggested Citation:"Appendix A Data Used in Net Present Value Analyses." National Research Council. 2007. Assessment of Wingtip Modifications to Increase the Fuel Efficiency of Air Force Aircraft. Washington, DC: The National Academies Press. doi: 10.17226/11839.
×
Page 74
Suggested Citation:"Appendix A Data Used in Net Present Value Analyses." National Research Council. 2007. Assessment of Wingtip Modifications to Increase the Fuel Efficiency of Air Force Aircraft. Washington, DC: The National Academies Press. doi: 10.17226/11839.
×
Page 75
Suggested Citation:"Appendix A Data Used in Net Present Value Analyses." National Research Council. 2007. Assessment of Wingtip Modifications to Increase the Fuel Efficiency of Air Force Aircraft. Washington, DC: The National Academies Press. doi: 10.17226/11839.
×
Page 76
Next: Appendix B Additional Methods for Improving Fuel Consumption »
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The high cost of aviation fuel has resulted in increased attention by Congress and the Air Force on improving military aircraft fuel efficiency. One action considered is modification of the aircraft’s wingtip by installing, for example, winglets to reduce drag. While common on commercial aircraft, such modifications have been less so on military aircraft. In an attempt to encourage greater Air Force use in this area, Congress, in H. Rept. 109-452, directed the Air Force to provide a report examining the feasibility of modifying its aircraft with winglets. To assist in this effort, the Air Force asked the NRC to evaluate its aircraft inventory and identify those aircraft that may be good candidates for winglet modifications. This report—which considers other wingtip modifications in addition to winglets—presents a review of wingtip modifications; an examination of previous analyses and experience with such modifications; and an assessment of wingtip modifications for various Air Force aircraft and potential investment strategies.

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