How much does a second seat add to empty weight of fighters?

riggerrob

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How much does a second seat add to the empty weight of a jet fighter or jet trainer?
Similarly, how much does a second pilot detract from payload (bombs and fuel)?
We are talking about fighters that were originally designed as single-seaters (F-5, F-16, F-18, Rafale, Tejas, etc.), but were later modified to accommodate a second pilot.
 

Archibald

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Usually, 1000 to 2000 pounds of fuel go away. And the guns, too.
 

CV12Hornet

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The two-seat Rafale B is 772 pounds heavier than the single-seat Rafale C. Similarly, the F-15B was about 800 pounds heavier than the F-15A. In terms of fuel lost, the F/A-18B lost 7% of its fuel load and the F-16B 17%.
 

zen

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The extreme case is the Harrier T which is something like 1,500lb
 

thefrecklepuny

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I did read some years ago in a book on the F-15 that the Eagle despite being primarily a single-seater was designed to accommodate a 2nd seat with zero fuel sacrifice.
 

F-2

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F-2a empty weight 21003 lbs
F-2b empty weight 21237 lbs
F-2a max fuel 1225 gallons
F-2b max fuel 1043 gallons
 

paralay

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Su-27 empty weight 17276 kg, fuel weight 9220 kg
Su-30 empty weight 18860 (MKK) - 19660 kg (MKI), fuel weight 9640 kg
 

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