HS -55, вам придеться покупать регулятор оборотов, скорее всего он бует со встроенным ВЕСом, напряжением 5 В. Серва HS -50 только для бортового напряжения 4,8 В (т.е скорее всего сгорет), HS -55 от 4,8 до 6В, у 55 сервы усилие в 2 раза больше! НЕмного сумбурно, Вам нужно брать 55 сервы.
Удача!
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