Afaik, also transfer fore and aft if equipped with those tanks, but airbus only has wing tanks. they can go rearward by transferring out towards the wing ends. Nose up is required for positive incidence, flying wings are only more efficient because they have fewer parts attached to the fuselage, (rudder and elevator intersection drag) they still need positive incidence.
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casual notes from the underground:There are some "experts" out there that in reality don't have a clue as to what they are doing.
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