f14

[edit] Engines and landing gear

An F-14 prepares to refuel with probe extended.The engines are fed by two rectangular air intakes located under the wings. These Pratt & Whitney JT10As (better known as the TF30) were relatively powerful for the time (5.670/9.480 kg/t) and being turbofans, they allowed reduced fuel consumption while cruising, which was important for long patrol missions.

Both air intakes have movable ramps and bleed doors that are operated by the air data computer to enable enough air to enter the engine while keeping shockwaves away from the engine. The exhausts also feature variable nozzles with moving petals that open or close depending on engine state. The TF30 engines left much to be desired both in power and reliability. John Lehman, Secretary of the Navy, told Congress that the F-14/TF30 combination was "probably the worst engine/airframe mismatch we have had in years" and said that the TF30 was "a terrible engine",[15][17] with F-14 accidents attributed to engine failures accounting for 28% of overall losses. Cracks in the turbines were dangerous to the point that the engine bay was reinforced in case of blade failure, to help reduce damage to the rest of the aircraft. The TF30 engines were also extremely prone to compressor stalls, which could easily result in loss of control due to the wide engine spacing, which causes severe yaw oscillations and can lead to an unrecoverable flat spin. At specific altitudes, the exhaust from a launched missile could cause the engine compressor to stall. This resulted in the development of a bleed system that temporarily reduced the power of the engine and blocked the frontal intake during missile launch. The overall thrust-to-weight ratio at maximum load is around 0.56, which does not compare favorably with the F-15A's ratio of 0.85.[19] Even so, the aircraft itself is able to reach Mach 2.4, and the maximum speed is officially Mach 2.34. Internal fuel capacity is 2,400 US gallons (9100 L): 290 US gallons (1,100 L) in each wing, 690 US gallons (2,600 L) in a series of tanks aft of the cockpit, and a further 457 US gallons (1,730 L) in two feeder tanks. The aircraft can carry two 267 US gallon (1,020 L) external drop tanks under the engine intakes.[7] There is also an air-to-air refueling probe, which folds into the starboard nose.


F-14 with landing gear deployed.The undercarriage is very robust, in order to withstand the harsh takeoffs and landings necessary for carrier operation. It comprises a double nose wheel and widely spaced single main wheels. The result is very different from the narrow and high undercarriage of F-15 Eagle. Both have similar weights and a high wing that makes undercarriage stowage impractical. The Tomcat fuselage is wider and the aircraft does not need to hold big external fuel tanks, as the Eagle often does, in the ventral positions. There are no hardpoints on the sweeping parts of the wings, and so all the armaments are fitted on the belly between the air intakes and on pylons under the wing gloves.