Da Vinci Helicopter Model Kit Machines Series By Academy 18159
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The kit is replica of da Vinci's Aerial Screw design,a forerunner of the modern helicopter.
Structurally unable to fly, da Vinci's design stimulated curiosity about the possibility of vertical flight.
A mechanical spring controls rotation and vertical movement of the fuselage
ACADEMY Da Vinci Machines Series Helicopter - #18159 by Academy Models