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Question regarding the Mig-21 external tanks


Balu

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While integrating the Mig-21 into my Flight Planning Tool I have noticed a difference between the manual and the values displayed in the mission editor.

 

Small external tank

Manual (page 15): 382kg fuel + 52kg tank weight= 434kg

Mission Editor: 436kg

Difference: 2kg

 

Big centerline tank:

Manual (page 15): 625kg fuel + 57kg tank weight = 682kg

Mission Editor: 689kg

Difference: 7kg

 

My question is, is this a mistake of the manual or is the mission editor displaying a wrong value for the tanks or is the difference the weight of the rack of the tank?

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I cannot answer your question directly, but I've faced the exact same problem when building my own Excel-based loadout/ops limits spreadsheet. Through some testing and logical deduction, I have found the following values are consistent with the numbers in the mission editor:

 

A 490-l tank holds 388 kg of fuel, and an empty 490-l tank (including the rack) weighs 48 kg.

A 800-l tank holds 639 kg of fuel, and an empty 800-l tank (including the rack) weighs 50 kg.

 

See also http://forums.eagle.ru/showthread.php?t=139374 for some of the related efflux of my testing.

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