В общем там так:
Задние заслонки перекрывают поток, и он направляется в каналы, находящиеся ЗА водометом, но ДО заслонок. Для руления задним ходом, заслонки НЕ размыкаясь сдвигались, закрывая левый или правый канал заднего хода. Все элементарно.
Кстати аналогичный водомет стоял и стоит на пограничных “Аистах” пр. 1398
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