Участник:Эйхер/Песочница: различия между версиями
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Строка 120:
When the vehicle goes downwind faster than wind, the wheels are used to harvest the power, thus impeding the motion of the vehicle and driving the rotor, who, acting as an airscrew, propel the vehicle, overcoming both the resistance of the wheels and the aerodynamic drag of the hull.
To elucidate symmetry between going upwind and going downwind faster than the wind, Ganuaa et al consider the latter case from the reference frame having speed of the wind (e. g. the reference frame of a baloonist travelling with the wind). From the viewpoint of the baloonist, the air is stationary, while the Earth is in motion. The vehicle is moving in the direction opposite to the motion of the Earth ("up the groundwind").
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