Just a side note on this issue regarding the SB-2:
The SB-2 had four fuel tanks, one on both sides of each engine. They were not protected with either armor or sealant. So, as it should be, taking a penetrating hit to a fuel tank will cause a leak until the tank runs dry.
The problem is that there is no way of isolating the leak to the affected tank. For example, if the no.2 tank got penetrated, the resultant leak will continue to run until all four tanks are empty. The aircraft's entire fuel supply from the remaining untouched tanks will drain out even if only one tank was damaged.
Though lovely and an enjoyable aircraft to fly, the SB-2 is already delicate enough without this crippling bug.
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