Thank Satovcha for the feedback and the rating of the puzzle "Autumn marathon"! Also thanks for the help in determining the authorship of the image.
"vehicles of the future from parts of the past?"
reminded Me of the unit on which A. Papanov swam in "the Diamond arm". It is called differently (torpedo, carrier scuba diver, underwater scooter or towing). The design is simple: a metal pipe with a battery (enough minutes at 80), motor and propeller. The pipe is attached to the handle: on one of "gas pedal", and another switch "lights".