Lifting Spirit Helicopter Metal ModelLifting Spirit Helicopter Metal Model SPECIFICATIONS: 134 Pieces Difficulty level 6 Hours to assemble (average): 8 Model size (cm): 18. 8 13 6 Model size (inch): 7. 4 x 5. 1 x 2. 3 Front+Rear moving Blades Patented Mechanism Windup mechanism Opening Doors PROTOTYPE HISTORY At the beginning of the 1900 century, Igor Sikorsky, a Ukrainian schoolboy from Kiev, saw a drawing of a flying machine having a Leonardo da Vinci propeller, and this gave spawned