uncleflo
Registered since September 28th, 2017
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MIT OCW - 2.972 How a Hydrofoil Works
Saved by uncleflo on February 12th, 2022.
The rquirement is to lift the boat's hull outside the water. Hydrofoil (It is a foil or wing under water used to lift the boat's hull until it is totally outside the water.) Explanation: 1. At low speeds the hull (body of ship) sits in the water and the hydrofoils are totally submerged in the water. 2. As the boat's speed increases, the hydrofoils create lift. 3. At a certain speed, the lift produced by the hydrofoils equals the sum of of the boat and cargo weights. Therefore the hull comes out of the water. 4. Instead of having an increase in drag with increasing speed because the hull is lifted out of the water (contrary to what happens in traditional boats due to pressure drag), the hydrofoils provide a more efficient way of cruising. Decreasing the drag contributes to the better use of the power needed for the movement of the boat.
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Compact XFoil Board Claims It Can Reach Speeds Comparable to 500 HP Boats
Saved by uncleflo on January 25th, 2022.
Compact but powerful, versatile, and capable of reaching speeds comparable to 500 hp speed boats, the XFoil is a three-in-one watercraft that allows you to ride on the surface of the water or fly above it. As fun as water sports can be, they are also money guzzlers. Especially if you want to make the best of them. Not everyone can afford to buy both a surfboard and a SUP (stand-up paddleboard), or a hydrofoil board, although it would be nice to be able to ride all of them. Designed in Silicon Valley, California, by PLX Devices, XFoil promises to offer the perfect solution: a watercraft that can serve as all of the above, while also making you feel like you’re in a high-performance speed boat. Everything is wrapped in a compact, lightweight, and durable package that’s small enough to fit in your mid-size sedan.
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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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AC75 -The 36th America's Cup boat concept - YouTube
Saved by uncleflo on December 28th, 2019.
An exciting new era in America’s Cup racing has been unveiled today as the concept for the AC75, the class of boat to be sailed in the 36th America’s Cup is released illustrating a bold and exciting modern vision for high performance fully foiling monohull racing yachts
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KING OF THE FOILERS? - Is the Moth still top? Who can take the crown? - YouTube
Saved by uncleflo on December 28th, 2019.
Double Olympic Medallist Saskia Clark takes a look around at the RYA Dinghy Show to find out if there's a foiling boat that can beat the popularity of the Moth. She checks out the Waszp, F101, Skeeta, UFO and the Flying Mantis.
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Flying sailboats designed by SEAir - Mini Transat
Saved by uncleflo on October 28th, 2019.
In early 2017, the Mini 747 prototype was the first and is still the only offshore racing monohull that can stay steadily airborne. At 8 knots of wind, only the foils touch the water, which means that it can reach higher speeds in certain points of sailing than those of water displacing sailing yachts twice its size. Up until now the boat showcased SEAir’s expertise and our technological development laboratory, but we are now getting it ready to return to racing. It will race in the events of the Mini circuit, including the well-known single-handed Mini Transat, blazing the trail of foiling monohulls crossing the Atlantic in record time. Having gained experience on the 747, SEAir is now in a position to design the elder sisters of this forerunner, destined to beat records and take part in the top open, single-handed, rating or crewed races. Currently only sailing on certain circuits, foiling boats will naturally continue their ascension and end up sailing in all racing programmes.
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FoilSim Download
Saved by uncleflo on June 3rd, 2014.
FoilSim - Student was developed at the NASA Glenn Research Center in an effort to foster hands-on, inquiry-based learning in science and math. FoilSim is interactive simulation software that determines the airflow around various shapes of airfoils. The Airfoil View Panel (shown below) is a simulated view of a wing being tested in a wind tunnel with air moving past it from left to right. Students change the position and shape of the wing by moving slider controls that vary the parameters of airspeed, altitude, angle of attack, thickness and curvature of the airfoil, and size of the wing area. The software displays plots of pressure or airspeed above and below the airfoil surface. A probe monitors air conditions (speed and pressure) at a particular point on or close to the surface of the airfoil. The software calculates the lift of the airfoils, allowing students to learn the factors that influence lift. The software includes a stall model for the airfoil and a model of the Martian atmosphere for lift comparisons. The latest version (FoilSim III - Version 1.4b) performs a table look-up of experimental data to determine the drag of the foil. A technical paper describing the details of the mathematical method used in FoilSim is also available.
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