Engineering Fundamentals: An Introduction to Engineering, 4th ed.c

Boeing 777 Commercial Airplane 547

(ETOPS). All 777s are ETOPS-capable, as part of the basic design. To ensure reliability, the

777 with Pratt & Whitney engines was tested and flown under all appropriate conditions

to prove it is capable of flying ETOPS missions. A summary of Boeing 777 specifications is

shown in Table 1.

Problems

1. Using the data given for the Boeing 777, estimate the flight time from New York City to
   London.


2. Estimate the mass of passengers, fuel, and cargo for a full flight.


3. Using the maximum range and fuel capacity data, estimate the fuel consumption of the
   Boeing 777 on a per hour and per mile basis.


4. Calculate the linear momentum of the Boeing 777 at cruise speed and at two-thirds maxi-
   mum takeoff mass.


5. Calculate the Mach number of the Boeing 777 at cruise speed using

Mach

cruise speed

1 kRT

TABLE 1 Boeing 777-200/300 Specifications

Design Variable 777-200 777-300

Seating 305 to 320 passengers in 368 to 386 passengers in

three classes three classes

Length 209 ft 1 in. (63.7 m) 242 ft 4 in. (73.9 m)

Wingspan 199 ft 11 in. (60.9 m) 199 ft 11 in. (60.9 m)

Tail height 60 ft 9 in. (18.5 m) 60 ft 8 in. (18.5 m)

Engines Pratt & Whitney 4000 Pratt & Whitney 4000

General Electric GE90 General Electric GE90

Rolls-Royce Trent 800 Rolls-Royce Trent 800

Maximum takeoff mass 506,000 lb 580,000 lb

(229,520 kg) (263,080 kg)

Fuel capacity 31,000 U.S. gallons 45,200 U.S. gallons

(117,335 L) (171,160 L)

Altitude capability 39,300 ft (11,975 m) 36,400 ft (11,095 m)

Cruise speed 555 mph (893 km/h) 555 mph (893 km/h)

Mach 0.84 Mach 0.84

Cargo capacity 5656 ft

3

(160 m

3

) 7552 ft

3

(214 m

3

)

Maximum range 5150 nautical miles; 5600 nautical miles;

5952 statute miles; 6450 statute miles;

9525 km 10,370 km

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