11-04-2018, 02:59
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חבר מתאריך: 07.04.08
הודעות: 6,949
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מדוע מטוסי ה-F-16 החדשים של ארה"ב אינם מתקינים את ה-CFT?
Fuel is the ever-present specter that looms over every pilot. It’s great when you have enough of it, and terrifying when you don’t. This is especially true for notoriously fuel hungry tactical fighters. Conformal Fuel Tanks (CFTs) have become an increasingly popular way to add range to existing fighter designs, such as the F-16, without making a large impact on the jet’s speed and agility. Many overseas operators utilize CFTs on block 50/52 and later Vipers, but why don’t America’s late model F-16s have a similar luxury?
Conformal Fuel Tanks are not just the domain of late model F-16s, the F-15 has long benefitted from its own CFTs, and CFTs are in the works for the Gripen, Super Hornet, Rafale, Ching Kuo and Eurofighter. Advanced versions of the MiG-29 have also been fitted with a dorsal conformal fuel tank and China’s J-10 has a CFT option in development.
The F-16’s CFTs weigh just 900 pounds per set and can carry 450 gallons, about 3,050 pounds of jet fuel. Considering that an F-16 holds about 7,000 pounds of internal fuel, just the CFTs alone offer a 43.5 percent fuel increase with little additional drag. Also, they don’t take up precious stores stations under the jet’s wings or belly like traditional drop tanks.
Pilots have been fairly explicit about how little the F-16’s CFT’s impact the F-16’s notoriously spirited performance. Maj. Timothy McDonald, U.S. Air Force project pilot for F-16 CFT testing at Eglin AFB described the bolt-on addition like this:
“The CFTs have very little adverse effect on the F-16’s renowned performance. A set of CFTs carries 50 percent more fuel than the centerline external fuel tank, but has only 12 percent of the drag. The aircraft retains its full 9-g capability and flight envelope with the CFTs installed. The drag impact is very small, less than one percent in combat configuration at cruise conditions.”
Stephen Barter, Lockheed’s CFT project pilot at the time of their developed also stated:
“The flying qualities of the F-16 with CFTs are essentially unchanged when compared to a non-CFT equipped airplane. For most combat flight conditions, it’s as if the CFTs are not even there. The surest way for me to tell if CFTs are installed is to look over my shoulder.”
F-16 CFTs are designed for the jet’s full flight envelope, up to 9 g’s, maximum angle of attack, sideslip and maximum roll rate and they have almost no impact on maneuverability or speed below mach one, where fighters spend the vast majority of their time. Even above mach one, they have less performance impact and carry more fuel then a centerline drop tank.
While Israel, Turkey, Poland, Greece, Morocco, Pakistan, Oman, Singapore and the UAE all actively use CFTs on their F-16 fleets, the U.S. has bypassed the option all together
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