По поводу бипланного крылышка. Да, плохая продольная устойчивость (устойчивость по тангажу) так и норовит нырнуть либо задрать нос. Как посоветуете подправить, не меняя основной конструкции?
Вот еще видео полета крыла. video.mail.ru/list/dimon372/fly/4.html
По продольной устойчивости поробуйте поменять угол “развала/сходимости” верхней и нижней плоскостей или поставьте rcopen.com/forum/f94/topic90444
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