Labels:book | earth | person | pole | poster OCR: FLIGHT While none ofa eonardo's flying machines ever got off the ground his designs were HELCOPTER astonishingly prophetic his famous drawing shows vertical screw of starched linen stretched onto metal frame. The linen screw was designed tc rotate rapidly when powered by someone pedaling underneath it LH Some consider this FLI invention to foreshadow the modern helicopter think, if this screw instrument is well made from linen starched (to block its pores aid is turned rapidly then said screw will climb upwards. 1996 SoftKey Multimedia Inc., subsidiary of SoftKey International Inc Leonardo desi gned serew 9661
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