Part 2: The aircraft reaches an altitude of 30000 ft and begins cruising. The mass of the aircraft at

the start of cruise is 78 tonnes and the fuel load that can be used for cruise is 12 tonnes.

a) assuming a cruise at constant altitude, determine the cruise range as well as the optimal airspeed

and Mach number at both beginning and end of cruise.

b) assuming cruise at a constant airspeed (given by the optimal airspeed at the beginning of cruise)

with a drag ratio n = 3, determine the cruise range as well as the altitude the aircraft reaches at

the end of cruise.

c) assuming cruise at a constant airspeed (given by the optimal airspeed at the beginning of cruise),

what would be the tailwind speed required to increase the range to 4700 km (assume tailwind

remains constant throughout the cruise)?