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50 Cost
Table 6-2. Cost model parameters.
parameter definition units
WE weight empty lb
WMTO maximum takeoff weight lb
Nblade
number of blades per rotor
P rated takeoff power (all engines) hp
WMEP fixed useful load weight, mission equipment package lb or kg
WFCE fixed useful load weight, flight control electronics lb or kg
rMEP cost factor, mission equipment package $/lb or $/kg
rFCE cost factor, flight control electronics $/lb or $/kg
L additional labor rate for composite construction $/lb or $/kg
Wfuel mission fuel burned lb or kg
Tmiss mission time hr
Rmiss mission range nm
G fuel cost $/gallon or $/liter
B available block hours hr
S spares per aircraft (fraction purchase price)
D depreciation period yr
V residual value (fraction)
L loan period yr
i interest rate %
TNF non-flight time per trip hr
Npass number of passengers
ρfuel fuel density (weight per volume) lb/gal or kg/liter
6–2 References
1) National Defense Budget Estimates for FY 1998/2010. Office of the Under Secretary of Defense
(Comptroller), March 1997/2008. Department of Defense deflators, for Total Obligational Authority
(TOA), Procurement.
2) Consumer Price Index. U.S. Department Of Labor, Bureau of Labor Statistics, 2009. All Urban
Consumers (CPI-U), U.S. city average, all items.
3) Harris, F.D.; and Scully, M.P.: Rotorcraft Cost Too Much. Journal of the American Helicopter
Society, vol. 43, no. 1, January 1998.
4) Harris, F.D.: An Economic Model of U.S. Airline Operating Expenses. NASA CR 2005-213476,
December 2005.
5) Coy, J.J.: Cost Analysis for Large Civil Transport Rotorcraft. American Helicopter Society Vertical
Lift Aircraft Design Conference, San Francisco, California, January 2006.