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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Rinspeed's first underwater Car
Saved by uncleflo on June 19th, 2014.
Rinspeed will present its new sQuba, the worlds first diving car, at the Geneva Motor Show (March 6-16). The car is not only able to drive on roads autonomously with a push of a button (thus without a driver, passenger or further assistance), but can also transform into an amphibious vehicle which can be submerged in water up to 10 meters (33 feet). An electric motor with powerful torque drives the rear wheels, while the propulsion on the water is ensured by two propellers in the stern and two powerful jet drives in the bow propelling the vehicle under water while diving. When underwater, the driver and passenger are enclosed in the vehicle thanks to light weight body components made of futuristic Carbon Nano Tubes and are supplied with fresh breathing air by the self-contained on-board system.
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