ROUNDSTUBE/aven1961

173rd Video of ROUNDS TUBE describes about the World Helicopter Day - Third Sunday in August each year. On Sunday 15 August 2021 join in this global celebration of one of the world’s greatest engineering inventions. World Helicopter Day aims to raise awareness of the contributions that helicopters make to our society and celebrate the diverse range of people that design, fly and support them. The day is held on the 3rd Sunday of August each year. 2021 will be the seventh year of the event. A helicopter is a type of rotor craft in which lift and thrust are supplied by horizontally-spinning rotors. This allows the helicopter to take off and land vertically, to hover, and to fly forward, backward and laterally. These attributes allow helicopters to be used in congested or isolated areas where fixed-wing aircraft and many forms of VTOL (Vertical Take Off and Landing) aircraft cannot perform. In 1942 the Sikorsky R-4 became the first helicopter to reach full-scale production. Although most

156th Video of ROUNDS TUBE describes about World Bicycle Day being celebrated annually on 3, JUNE. In 2018 the United Nations declared 3 June as World Bicycle Day. World Bicycle Day is a chance for people around the globe to pay tribute to the bicycle and the many benefits it brings to society. On this World Bicycle Day, let's cycle our memories and make bicycles more a part of our lifestyle. -- Bicycling is the nearest approximation I know to the flight of birds. Happy World Bicycle Day 2021. World Bicycle Day draws attention to recognise the longevity, uniqueness and versatility of the bicycle, and that it is an affordable, reliable, simple, clean and environmentally fit sustainable means of transport. A study of 264,337 people found that cycling to work is linked with a 45% lower risk of developing cancer, and a 46% lower risk of cardiovascular disease compared to commuting by car or public transport. As little as 20 miles a week on a bike can reduce your risk of coronary heart