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
towing of gliders
autonomous self lauch of older gliders without propulsion
Thrust increase for airliners to increase payload
Start und range increase for electrical airliners
Towback of gliders
Start of gliders for freight transport
that means also decoupling of airframe and propulsion-system