| 摘要 |
A drive system which is of simple design for an aircraft which can preferably move vertically consists of an element which can be set in rotation and is constructed from at least two conical spirals. Arranged on the steps running between the mutually adjacent spirals are projections which form airflow channels through which air which is picked up during rotation on the outer surface of the element is forcibly guided into the interior and can emerge from there through the open base.
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