Question

The main landing gear of the Fokker F27 twin turboprop transport aircraft is shown below. A kinematics and force analysis has shown that the maximum force exerted by the retraction actuator is 12,000 lb and the actuator stroke is 14.25 in. Assume the following: • The gear must be fully retracted in 10 sec • There are two main gear unit and a nose gear, and the nose gear is identical to the main gear (for simplicity) • Maximum system pressure is 3,000 psi. Estimate the following: al Required actuator size, that is, cylinder bore and piston rod diameter. Use a 2:1 area ratio for the rod and head end areas. What does this ratio imply for the performance of landing gear? (piston approx. 3.2 india, and piston rod 2.25 in) by Calculate the hydraulic power to retract all three landing gear units simultaneously. (approx. 7.8 hp)

Answer 1

Explanation:

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