Re: Did you know that a rotating speed of a helicopter is much slower than the one of an electric fan? (ヘリコプターのメインローターの回転数って、扇風機の「弱」よりも遅いって知ってた?)

When I watched a video of an helicopter’s takeoff that I took yesterday, I was a bit surprised to notice that the rotating speed of the main rotor was rather slower than I had thought. (@@);;;

After looking it up on Google, I found the speed is usually 200 – 400 rpm (3 – 7 rps), much slower than the one of an electric fan, even a “Low” mode (500 – 600 rpm). You can know it when you see the video below.

【日本語訳】

タイトル:ヘリコプターのメインローターの回転数って、扇風機の「弱」よりも遅いって知ってた?

昨日撮影したヘリコプターの離陸時の動画を見かえしていたら、メインローターの回転速度が思っていたよりもずっと遅いことに気づいて少し驚きました (@@);;;
Googleで調べてみたところ、メインローターの回転速度は通常200~400 rpm(3~7 rps)で、扇風機の「低速」モード(500~600 rpm)よりも遅いことがわかりました。
下の動画を見れば分かります。

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