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INVENTIONS OF LEONARDO: AERIAL SCREW 2019 Niue 1oz proof silver coin
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2019 Inventions of Leonardo – Aerial Screw
Published on the occasion of the 500th anniversary when the Renaissance man exhaled the last time, the first silver coin represents a flying machine that is similar to today’s helicopter.
Leonardo had been fascinated by the birds since the childhood, and dreamed that he will once fly with them. Because he was not only an unrivalled artist, but also a brilliant designer, he sketched out 150 designs of sophisticated machines to fulfill his dream. There were parachutes or so-called ornithopters with wings to fly. Another flying machine to use the human force was a so-called “air screw”. Why the screw? Leonardo believed that the air was compressible, so had to have a tangible density to which the screw could go to – just like the screw into the wood. This conclusion could be reached by observing the winged maple seeds that are rotating when they fall on the ground.
When it goes down, why it could not go up with the right drive? The invention was provided with a complex system of pedals, gears and levers by which the four-men crew had to spin a spiral propeller. Though Leonardo was thinking about lightweight materials – linen, reed and wire – the machine would be too heavy. And because it would not have enough lift, it would never take off. At the end of his life, Leonardo realized that the human force was not enough to take off, and he returned to the drawing board. But this is the story of another invention … Still, four centuries later Leonardo´s draws inspired Igor Sikorsky, who is the designer of the first real helicopter.
Presents a drawing of the invention with Leonardo’s notes. The maestro observes it from the top of the reverse side, and the English inscription presents AERIAL SCREW.
Shows all of the inventions that will appear in the miniseries. Apart from helicopter there is a glider, a machine gun and a tank. The name and the portrait of Queen Elizabeth II, the nominal value of 1 DOLLAR (NZD) and the year of the issue 2019.
Presented in a small coin box with an enclosed certificate of authenticity. A collectors tin to hold all four coins is available at extra cost.
|DENOMINATION||$1 New Zealand (Niue)|
|COMPOSITION||31.1 grams (1oz) of 0.999 silver|
Coming in 2019
The other three coins are the Glider (March), the Machine Gun (July) and the Tank (September).