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No, I think it's just supposed to be examples of 30's civil aviation.
Aerotowing a primary glider can be done, but is uncomfortable for all involved. The top speed of the glider - even with a pod fuselage- is so slow that the tow plane is near stall while the glider is screaming along at the top of the rope.
Primary gliders are usually bungee launched (gigantic bit of knicker elastic), ideally over a slope that falls away just a little more steeply than the glide ratio of the airplane.
Then all the cadets rush down the hill and drag the plane back to the top to do it over again.
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I'm not making it up as I go along, I'm establishing precedent
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