прежде всего, из-за появления сильного рысканья по курсу - при приближении к скорости отрыва (отчасти следствие неудачного реданирования)
А также перетяжелено крыло.
План на зиму - доработать крыло: с учётом результатов скорректировать геометрию, а также облегчить.
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