В одну. Но если обратили внимание - то винты на консолях размещены на рулевых машинках, в пределе их можно развернуть на 90 градусов в каждую сторону. Так вот - отклонения на 10-15 градусов навстречу направлению закрутки вполне хватает чтобы компенсировать закрутку потока от винтов.
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