uncleflo
Registered since September 28th, 2017
Has a total of 4281 bookmarks.
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Tag selected: circulation.
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Arvel Gentry | North Sails
Saved by uncleflo on April 10th, 2021.
In the first edition of the Art and Science of Sails, written by Tom Whidden, president of North Sails Group, LLC, and Michael Levitt, and published by St. Martin’s Press, the authors used Arvel Gentry’s now famous Bathtub Experiment to demonstrate the existence of Circulation, or a second force, that operates around an airfoil, like a sail, wing, or keel etc. Big picture: it’s the combined effort of these two forces that makes the wind speed up on the leeward side — and thus show low pressure — and slow down on the windward side of a sail — high pressure. Gentry was the Boeing engineer who first taught sailors aerodynamics. These diagrams first appeared in Gentry’s Sail magazine articles. In the Revised Edition, the authors used computer testing to show where the wind speeds up around a sail plan and where it slows down. And why and by how much? Nevertheless, Gentry’s experiment is the standard — still popular on the web — and it was left it out of the Revised Edition with trepidation, but we linked in the book to this web page.
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Zimbabwean entrepreneur launches Europe s first autonomous delivery vehicle, Kar-go
Saved by uncleflo on July 30th, 2019.
The vehicle was praised by both English Dukes and Zimbabwean dignitaries Zimbabwean, William Sachiti and his team at the Academy of Robotics launched Europe s first roadworthy autonomous delivery vehicle, Kar-go which aims to reduce the cost of last-mile delivery by as much as 90 percent. In the first week of its launch, Kar-go has been hosted by the Duke of Richmond and praised.
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Queen Mary Sailing Club - Courses - Adult
Saved by uncleflo on November 29th, 2018.
The Club was founded in 1972 on Queen Mary Reservoir which was originally built between 1919 and 1924. We are very proud of our rich heritage as a top racing venue, the home of the iconic Bloody Mary as well as a friendly members Club with a firm place in the local community. The plans for building the reservoir were originally concieved in 1912 when it was first thought that two would be built. These were subsequently altered with the bund (or baffle) put in place to promote water circulation from inlet to outlet. This measure was considered to be important to promote the purity of the water prior to the introduction of chlorination in 1916. The reservoir was completed on Dec 31st 1924 and opened by King George V on June 12th 1925. It has a surface area of 707 acres and has a capacity of 6,700 million gallons. The length of the perimeter is nearly four miles and the City of London could easily be accommodated in it. Click here for more details.
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1963 Gold Sovereign
Saved by uncleflo on August 24th, 2012.
Not every date exists for gold sovereigns. In fact gold sovereigns were not issued for circulation after 1932, although the Royal Mint resumed production in 1957 partly to meet world demand for gold bullion coins. The only dates minted between 1932 and decimalisation were 1957 to 1959, and then 1962 to 1968. These dates all bear the first portrait of Queen Elizabeth II as used on almost all pre-decimal coins, with the familiar St. George & Dragon design on the reverse.
Of these dates 1957 and 1959 are the two most difficult to find. All others can be difficult to find when you need them!
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