eine Drohne, die schleppt oder ein Antrieb der sich entkoppelt /carrier drone : a tow drone as a separable propulsion system
Auxiliary propulsion system may not disturb or endanger the soaring flight. This requirement was the origin of the retractable propulsion systems. The "Schubklappe" or pusher-flap is one of this propulsion systems.
One step furhter is the idea of the carrier drone or tow drone. This propulsion unit simply separates from the airplane. A normal tow plane is therefor a kind of manned carrier drone.
The drawing shall illustrate the carrier drone principles.
The first example shows a conventional towing plane with over the wing propellers
The second example shows a wing mounted carrier-drone.
The area of application is not only the towing of soaring planes: Possible are
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towing of gliders
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autonomous self lauch of older gliders without propulsion
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Thrust increase for airliners to increase payload
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Start und range increase for electrical airliners
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Towback of gliders
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Start of gliders for freight transport
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that means also decoupling of airframe and propulsion-system