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The Water Cooler
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Trivia: explain this video
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<blockquote data-quote="rhodesbe" data-source="post: 1951500" data-attributes="member: 2415"><p>The shutter speed has been sync'd (on purpose, or through freakish accident) to match the RPM of the main rotor (<a href="http://www.aerospaceweb.org/aircraft/helicopter-m/mi24/" target="_blank">~240 RPM</a>)</p><p></p><p>If the shutter opens/closes 1/240s -or once cycle every .00417 seconds - (fast shutter eliminates motion blur) then it would appear the main blades do not move.</p><p></p><p>Notice how the tail rotor is moving - that's because it has a dynamic RPM - the RPM is always adjusting based on the pitch/yaw of the copter and where the pilot wants to steer it.</p><p></p><p>Incidentally, you'd never see this at night. Really. With such a fast shutter as 1/240s, light would have a difficult time exposing the image sensor. Only because this is taken outside on a stark sunlit day is there enough light available to see the subject.</p></blockquote><p></p>
[QUOTE="rhodesbe, post: 1951500, member: 2415"] The shutter speed has been sync'd (on purpose, or through freakish accident) to match the RPM of the main rotor ([URL="http://www.aerospaceweb.org/aircraft/helicopter-m/mi24/"]~240 RPM[/URL]) If the shutter opens/closes 1/240s -or once cycle every .00417 seconds - (fast shutter eliminates motion blur) then it would appear the main blades do not move. Notice how the tail rotor is moving - that's because it has a dynamic RPM - the RPM is always adjusting based on the pitch/yaw of the copter and where the pilot wants to steer it. Incidentally, you'd never see this at night. Really. With such a fast shutter as 1/240s, light would have a difficult time exposing the image sensor. Only because this is taken outside on a stark sunlit day is there enough light available to see the subject. [/QUOTE]
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