Соосность и сложность изготовления убьет все плюсы и прибавки в КПД, тут даже спорить нечего.
ща появилисЪ моторки с большими дырками , аля под Slip Ring … при соответствующей намотке может крутить нижний проп , а ось верхнего пропа пропускаем через дырку …
Можно не страдать, а поставить снизу рамы такой же винт обратного вращения
с изменяемым шагом вроде только куртис янгблад летает.
Можно не страдать, а поставить снизу рамы такой же винт обратного вращения
и получится примерно это:
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