Academy Da Vinci Machines Series Helicopter - #18159 by Academy Models;

ACA18159 Helicopter Da Vinci Machine Series Academy Models

Da Vinci Series Helicopter
This kit is a replica of da Vincis Aerial Screw design, a forerunner of the modern helicopter.
Structurally unable to fly, da Vincis design stimulated curiosty about the possibility of vertical flight; a mechanical spring controls rotation and vertical movements of the fuselage.

Model requires assembly.