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Not a lot of tall stuff to hit in Siberia taller than a tree. Since ground effect is typically 1.5 times wingspan just fly over it temporarily so yup it does need to actually free air fly. They do the ground effect because it's much more efficient and have nothing of importance to fly into.
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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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