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There are differences between this craft and an airship, insofar as not all its lift comes from gas, [ it has wings], its range is close to unlimited, and it may
fly faster than an airship[we haven't been told yet]. For its supposed main
purpose it doesn't matter much how long it takes to get to its station, and
lastly the upper jetstream is very weak at 10/16km/hr, and in any case
doesn't reach that high an altitude. At 20km it is above the jetstream.
raymo
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