How does the MiG-29 fuel system work? Like, where does it store around 300 cubic feet of fuel?
Also, which fuel does it use? Is JP4 preferable?
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The aircraft is equipped with seven (7) integral fuel tanks: five (5) Center body fuel tanks and two (2) wing tanks. Center body fuel tank #2 serves an an engine feeder tank with all other tanks transferring fuel to it via a network of fuel pumps for consistent weight and balance. The aircraft can be refueled by means of a single pressure refueling receptacle located in the port main landing gear well.
(Source: Luftwaffe MiG-29 Flight manual)
Like every plane, the MiG-29 stores its fuel in fuel tanks ;)
On a more serious manner:
Generally speaking, there are 6 internal fuel tanks: 4 distributed around the fuselage and 1 in each wing.
Later versions (namely the SMT) have larger internal fuel capacity thanks to the enlarged spine.
The exact locations of these tanks can be seen in this cutaway (src): 63, 72, 93, 107, 187.
In addition to these, the 29 can also carry 3 (1 in the very early versions) jettisonable external fuel tanks.