These 2 awesome kits are brand new, factory-sealed! You will receive:Helicopter- a working re-creation of Leonardo da Vinci's 15th century "Aerial Screw". The Aerial Screw is one of Leonardo's most iconic drawings. This working model uses a bevel gear to spin the canopy and support structure. The canopy and support structure is removable. Catapult- catapults were first invented in Ancient Greek and Roman times. Leonardo redesigned the catapult and used the spring-like energy stored in bent wood to give power to the swing arm. Each kit:
is easy to make in about an hour made of natural untreated wood all pieces are pre-cut and ready to go parts are pegged for extra strength From a smoke-free home. I am will to sell the kits individually. Please check out my other items!