Conformal fuel tank

Conformal Fuel TanksconformalFAST PackFuel And Sensor Tactical (FAST) Packsslipper tanks
Conformal fuel tanks (CFTs) are additional fuel tanks fitted closely to the profile of an aircraft that extend either the range or "time on station" of the aircraft.wikipedia
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Drop tank

drop tanksfuel tanksdrop-tanks
CFTs have a reduced aerodynamic penalty compared to external drop tanks, and do not significantly increase an aircraft's radar cross-section.
Some modern combat aircraft use conformal fuel tanks (CFTs) instead of or in addition to conventional external fuel tanks.

McDonnell Douglas F-15E Strike Eagle

F-15E Strike EagleF-15EF-15I
United States Air Force (USAF) F-15E Strike Eagles can be generally distinguished from other U.S. Eagle variants by darker aircraft camouflage, conformal fuel tanks (CFTs) mounted along the engine intake ramps (although CFTs can also be mounted on earlier F-15 variants) and a tandem-seat cockpit.

McDonnell Douglas F-15 Eagle

F-15 EagleF-15F-15C Eagle
These models were fitted with the Production Eagle Package (PEP 2000), which included 2,000 lb (900 kg) of additional internal fuel, provisions for exterior conformal fuel tanks, and an increased maximum takeoff weight up to 68,000 lb (30,700 kg).

General Dynamics F-16 Fighting Falcon variants

F-16C/D Fighting FalconF-16IF-16C/D
This variant's main differences are the addition of support for conformal fuel tanks (CFTs), a dorsal spine compartment, the APG-68(V9) radar, an On-Board Oxygen Generation System (OBOGS), and a JHMCS helmet.

Eurofighter Typhoon

TyphoonEurofighterTyphoons
Additionally, the RAF has sought to develop conformal fuel tanks (CFT) for their Typhoons to free up underwing space for weapons, and all Tranche 3 aircraft are fitted to accept these tanks.

Boeing F/A-18E/F Super Hornet

F/A-18E/F Super HornetF/A-18E Super HornetF/A-18F Super Hornet
In March 2013, the U.S. Navy was considering the widespread adoption of conformal fuel tanks, which would allow the Super Hornet to carry 3500 lb of additional fuel.

Fuel tank

Fuel capacitygas tankfuel cell
Conformal fuel tanks (CFTs) are additional fuel tanks fitted closely to the profile of an aircraft that extend either the range or "time on station" of the aircraft.

Radar cross-section

radar cross sectionradar signatureRCS
CFTs have a reduced aerodynamic penalty compared to external drop tanks, and do not significantly increase an aircraft's radar cross-section.

Hardpoint

pylonhard pointpylons
Another advantage CFTs provide is that they do not occupy ordnance hardpoints like drop tanks, allowing the aircraft to carry its full payload.

Plumbing

water pipepipewater pipes
Conformal fuel tanks have the disadvantage that, unlike drop tanks, they cannot be discarded in flight, because they are plumbed into the aircraft and so can only be removed on the ground.

Dassault Group

DassaultGroupe Industriel Marcel DassaultSociété de Véhicules Electriques