Answer
A WORM GEAR
蝸桿
WINDOW QUESTION · ANSWERBUILD CLUB
The question
WHICH SCREW-SHAPED GEAR DRIVES THE TWO ROTOR PATHS IN THIS HELICOPTER MODEL?
直升機模型用哪一種螺旋狀齒輪帶動兩條旋翼傳動路徑？
Why it works
IT DRIVES TWO 24-TOOTH GEAR PATHS, MOVING BOTH THE MAIN AND TAIL ROTORS
蝸桿帶動兩個 24 齒齒輪傳動路徑，讓主旋翼和尾旋翼一起轉動
See it in action · THE HELICOPTER ROTOR MECHANISM
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