How Man Conquered the Skies - Glider

Niue Islands 2010 - $1 - How Man Conquered the Skies - Glider - 28,28g LIMITED Silver Coin

6.000 of these coins were issued by Mint of Poland!
This silver proof coin is dedicated to Mankind.
$57.33

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Country Niue Islands
Year 2010
Face Value currency Euro
Face Value number 1
Metal Silver
Fineness 925/1000
Weight 28,28g
Dimensions 40 x 28 mm
Mintage 6000
Quality Proof
Certificate of authenticity yes
Presentation Case no
Price $57.33
Coin Story

Otto Lilienthal (1848-1896) designed and flew the first gliders. He spent 25 years working on developing gliders. Together with his brother, Gustav, in the years 1867-68 he conducted a number of experiments with glider flights, which led them to believe that the source of a strong aerodynamic lift is the moving of oblique planes. A gliding flight they completed using a bird-shaped kite reaffirmed their view that flying with stationary wings was possible. Otto spent a lot of time observing birds and studying air drafts. He then published a book titled “Birdflight as the Basis of Aviation” in which he described most of his observations. In 1890 the Lilienthal brothers built a glider with a wing span of 11 meters. The initial distances covered with the machine ranged between 6-7 meters, and after they had added a tail plane they could fly for some 25 meters jumping from an elevation of 5 meters. In 1893 Otto Lilienthal patented his glider whose wing shape was close to that of a bat, and the body was covered with wooden paneling. In the middle of the construction there was a place for the pilot who controlled the device by changing the center of gravity moving their legs forwards, backwards or sideways. The maximum distance flown reached 250-300 meters. In 1896 the designer started building a glider equipped with control surfaces, with movable wing edges, to be propelled with a small two-cylinder engine. This project ended with the designer’s death. On 9 August 1896, during a flight at an altitude of some 15-20 meters, an unexpected wind burst made the glider fall. Otto Lilienthal is considered the “father of gliding”, and was the first man to have largely controlled the gliding flight. The extensive research on profiles conducted by the designer and the selection of the best shapes made the work of future aviators much easier. He also designed methods of presenting the characteristics of profiles using polar diagrams, also known as the Lilienthal curve. The method is still used today to measure aerodynamics and when designing gliders, airplanes, helicopters and rockets.

Reverse Design

In the central part of the coin: a stylized image of the glider. At the bottom: an image of the constructor and an inscription: OTTO LILIENTHAL. In the background lines symbolizing the trajectory of the glider.


Obverse Design

The central part of the coin features images of flying objects: a technical drawing of an Antonov plane wing, to the right an engine with a star pattern of pistons, to the left a profile of an aerobatics plane, and above it a bird’s wing. To the left side of the coin, along its rim an inscription: Niue Island and the face value: 1 Dollar, issue date: 2010. In the top part of the coin a likeness of the queen with the inscription: Elizabeth II, the mark of the Mint of Poland (MW), and along the rim the title of the series: “How Man Conquered the Skies”.

Packaging

The How Man Conquered the Skies - Glider silver coin comes encapsuled, with a Certificate of Authenticity.

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