У них на гарфиках четко видно что скорость ветра преодолевалась ИМПУЛЬСАМИ и отнюдь не в 3 раза.
Что не ясно?
Если относительно ветра скорость устройства равна 0 то и снимаемая мощность рана 0. и чем больше относительная скорость то тем больше мощность , причем в КУБЕ от скорости.
А так для более ясности открываешь книжки ,например
Фатеев " ветродвигатели и ветроустановки"
Какой нибудь учебник аэродинамики , и "Руководство для конструкторов " т1
учебник физики для общего понимания процессов и все.
тут важен принцип а то что скорость у них не всегда была больше скорости ветра связано с недостатками конструкции и кучей паразитных параметров и т.п
Rick Cavallaro and John Borton have built a cart that moves 2.86 times the speed of the wind,
вот обьяснение>>>
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⚠ Тільки зареєстровані користувачі бачать весь контент та не бачать рекламу.
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....The key to it all is the difference between relative air speed and actual ground speed. Let’s go back to the balloon. The balloon propelled by the 10 kph wind is moving at 10 kph along the ground, but it’s relative air speed is 0 kph. It’s moving the same speed as the wind. ...........
The key to it all is the difference between relative air speed and actual ground speed. Let’s go back to the balloon. The balloon propelled by the 10 kph wind is moving at 10 kph along the ground, but it’s relative air speed is 0 kph. It’s moving the same speed as the wind.
But unlike the balloon, the cart has a 17-foot propeller linked by a complicated drive train to the wheels.
And it’s the wheels that provide the work to turn the propeller. Remember that: The wheels turn the prop. Not the wind. Not magic pixie dust.
The wheels turn the propeller. That’s important.
At 0 kph air speed, the propeller, sections of which have already been pulling on the car, really begins to bite on the air. It pulls the car forward exactly as a propeller pulls an airplane forward. The ground speed of the car increases, turning the wheels faster, which turn the propeller even faster, adding yet more acceleration. And now the whole project seems ridiculous,because everyone knows a perpetual motion machine is impossible.
But the wind never stops adding power to the system. Come back to the difference between the relative air speed and the ground speed. In the example, the cart reaches a ground speed of 10 kph, and relative air speed of 0 kph. The propeller kicks in and the cart accelerates: Ground speed rises to 20 kph, with relative air speed of 10 kph; then 30 kph ground speed with relative air speed of 20 kph, then it finally reaches a top speed of 28.6 kph, with a relative air speed of 18.6 kph (meaning, going 18.6 kph faster than the wind). There’s some loss to friction and to the drive train, but generally the wheels are always doing 10 kph-worth more work then the propeller, because the propeller is pulling through air that’s already moving of its own accord (Cavallaro and Borton like to compare this to how a boat driving down river moves faster than a boat in still water). That difference in work is where the extra energy enters the system, allowing the cart to move faster than the wind directly before the wind. .............
....The two men got into the project as an academic exercise, a kind of proof of concept with no real application. But they’ve since realized they designed and built a device that extracts an extraordinary amount of energy from the wind, indeed, far more than any stationary wind turbine currently dotting Texas or the seas north of Germany.
Borton said their cart derives 23 horsepower at top speed, roughly four times the theoretical maximum and seven times the amount of work a traditional wind turbine gets. They’ve formed a company, called Thin Air Designs, to try and tap the commercial potential of their cart.....
а конструкция у них судя по фоткам весьма дешевая...пропили
Описание термина - дык я его и так знаю... Расчеты было б неплохо увидеть.. Какие 5 раз???? Откуда 5?
Если хотим ехать точно против или по ветру.
