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Izismile.com » Videos » Helicopter taking off. Look at the propellers. And how is this possible? (4.6 Mb)

Helicopter taking off. Look at the propellers. And how is this possible? (4.6 Mb)

Posted in Videos 1 Apr 2009 / 2919 views

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torbengb 3 year s ago

The trick is easily explained:
The rotor is turning fast, but the frame rate of the camera is almost the same as the rotation speed, so it looks like it only turns slowly. If the rotation speed is slightly adjusted, it would seem like it's not turning at all. You'd see the same effect on an old turntable (grammophone).

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crownroyalty 3 year s ago

Booo

Bow before the greatness that is Super
Rise by the hand of Milow

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RFC1795 3 year s ago

@ torbengb - Couldn't have explained it better... you're spot on. Same how we test wheel balancing, and timing on cars using strobe lights.
Sometimes it even appears to change direction. Unusual to see in a vid .. nice one.

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classical physicist 3 year s ago

@RFC1795: it is actually all too common to see in a vid, because the disparity between the rotor frequency and camera framerate makes the effect obvious. Notice the way televisions and other displays have excruciatingly slow-moving scanlines when vids are taken of them.

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Paul cheshire 1 year ago

a. they're called rotor, not propellers, and b its an effect caased by frame speed of the camera used, It's the same effect tha used to make stagecoach wheels go backwards in the old westerns. Don't believe everything you see on the Internet is real, shithead!!!

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