Question

For the CJ-1 aircraft

1. Calculate fuel used for takeoff if the aircraft taxies for 10 minutes at 10% thrustand takes 30 seconds to takeoff at maximum thrust.
2. Calculate the best velocity to climb and the best rate of climb at sea level at maximum weight minus the fuel used for taxi and takeoff.
3. Calculate the best velocity to climb and the corresponding rate of climb at 40,000 ft at the previous weight. (Assume thrust at 40,000 ft. is reduced proportionally with standard density.
4. Calculate the time and fuel used to climb from sea level to 40,000 ft. using the rates of climb calculated before.
5. Calculate the initial weight of a 30 minute loiter at 5,000 ft. with a final weight of zero-fuel-weight plus 6% reserves based on total fuel weight.
6. Calculate best range for an initial weight equal to maximum minus taxi+takeoff+climb fuel and a final weight equal to the weight calculated at item 5.

CJ-1: Wingspan = 53.3ft, wing are = 138ft^2, Normal gross weight = 19815lb, Fuel capacity: 119 gal of kerosen, power plant: two turbofan engines of 3650lb thrust each at sea level, specific fuel consumption = 0.6lb of fuel/(lb Thrust)(h), parasite drag coefficeint CD,0 = 0.02, Oswald efficiency factor e = 0.81

Answer 1