The tethered craft idea might have worked for raiders but U-boat captains were opposed to the idea because of the time they would have to spend prepping and retrieving craft (un-powered auto gyro), time were they would have been vulnerable to enemy ships and aircraft. If the enemy showed up while the craft was in the air, the craft would have to be abandoned to its fate.thought the Flettner was actually fairly developed craft? http://www.aviastar.org/helicopters_eng/flettner_kolibri.php (that article mentions early tethered craft also, which would have been useful for u-boats and raiders)
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