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#21
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Spinner strobing as a "Bird Strike Countermeasure"
"Airbus" wrote in message ... In article , says... Hence the reason an aircraft propeller will appear to be revolving slowly backwards at times. Not when being observed directly. That only happens in movies and video due to the interaction between the imaging rate and the rotation rate of the propeller. Wrong again you clueless twit. No, he is right this time. No he isn't. |
#23
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Spinner strobing as a "Bird Strike Countermeasure"
In rec.aviation.piloting Airbus wrote:
In article , says... "Airbus" wrote in message ... In article , says... Hence the reason an aircraft propeller will appear to be revolving slowly backwards at times. Not when being observed directly. That only happens in movies and video due to the interaction between the imaging rate and the rotation rate of the propeller. Wrong again you clueless twit. No, he is right this time. No he isn't. Wellllllllll.............. The world is listening . . . When observed directly under artifical light that "flickers", the most obvious being a strobe light, but there are other types of artificial lights that have flicker. -- Jim Pennino Remove .spam.sux to reply. |
#24
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Spinner strobing as a "Bird Strike Countermeasure"
"Airbus" wrote in message ... In article , says... "Airbus" wrote in message ... In article , says... "Airbus" wrote in message . .. In article , says... Hence the reason an aircraft propeller will appear to be revolving slowly backwards at times. Not when being observed directly. That only happens in movies and video due to the interaction between the imaging rate and the rotation rate of the propeller. Wrong again you clueless twit. No, he is right this time. No he isn't. Wellllllllll.............. The world is listening . . . Indeed. Still listening . . . Simple question, to get you started on your explanation; Have you ever been in a propeller-driven airplane? I have been a pilot since 1972. |
#25
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Spinner strobing as a "Bird Strike Countermeasure"
"Airbus" wrote in message
... In article , says... Wrong again you clueless twit. No, he is right this time. Rule #1: MX is never right Rule #2: Is by some wild mistake (think monkeys typing) , MX is not actually incorrect, see rule #1 |
#26
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Spinner strobing as a "Bird Strike Countermeasure"
In rec.aviation.piloting Airbus wrote:
In article , says... When observed directly under artifical light that "flickers", the most obvious being a strobe light, but there are other types of artificial lights that have flicker. -- Fine - but which ones cause you to see the propellers turning in apparent reverse? Do you frequently operate your airplane indoors? Propellers are usually observed in natural light, which does not flicker. At night, on the rare occasions where you actually see the props clearly, it is from the aircraft's own lighting, which is DC. I have nbever seen the props turning backwards on a real plane - see it frequently in movies though. . . Any light that flickers at an appropriate rate will cause the prop to appear to turn in reverse. The likelyhood of being somewhere with lights that flicker is irrelevant. The original statement was that it -ONLY- happens in movies and video, and that absolute statement is false as are most of MX's absolute statements. -- Jim Pennino Remove .spam.sux to reply. |
#27
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Spinner strobing as a "Bird Strike Countermeasure"
In article twV4j.1755$QS.57@trndny03,
"Yes - I have a name" wrote: "Airbus" wrote in message ... In article , The frame-rate was increased from 16 to 24 at the introduction of sound (not color). The increased linear speed was desirable to improve fidelity of the analog optical soundtrack on the film. In either case, 24 or 16 FPS, each image is projected three or two times (respectively) to produce an effective rate of 48 - this was done to avoid perception of flicker. Anyone know off hand what the frame rate was for home movies (8mm)? It was supposed to project at 16fps, which makes for a bit of adjustment when converting old home movies to DVD. |
#28
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Spinner strobing as a "Bird Strike Countermeasure"
"Airbus" wrote in message ... In article , says... When observed directly under artifical light that "flickers", the most obvious being a strobe light, but there are other types of artificial lights that have flicker. -- Fine - but which ones cause you to see the propellers turning in apparent reverse? Do you frequently operate your airplane indoors? Propellers are usually observed in natural light, which does not flicker. At night, on the rare occasions where you actually see the props clearly, it is from the aircraft's own lighting, which is DC. I have nbever seen the props turning backwards on a real plane - see it frequently in movies though. . . Do you really think you see and visualize motion constantly. Perhaps you should spend a little more time around and airport yourself. Many propellers, especially the large diameter props found on radial engines, will appear at times to be rotating slower, or backwards. It's a fainter image than recorded on film, but the partnership of the human eye and brain does not realize fluid motion. Motion pictures captured on film greatly exaggerates the phenomenon. Some of the new video equipment will seem to even stop a prop to the extent it's distracting to the quality of the recording. But the human visual system well do so as well, just to a much lesser extent. |
#29
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Spinner strobing as a "Bird Strike Countermeasure"
"Airbus" wrote in message ... In article , says... When observed directly under artifical light that "flickers", the most obvious being a strobe light, but there are other types of artificial lights that have flicker. -- Fine - but which ones cause you to see the propellers turning in apparent reverse? Do you frequently operate your airplane indoors? Propellers are usually observed in natural light, which does not flicker. At night, on the rare occasions where you actually see the props clearly, it is from the aircraft's own lighting, which is DC. I have nbever seen the props turning backwards on a real plane - see it frequently in movies though. . . Apparently, you aren't familiar with the trick of calibrating your tachometer with the 120Hz flickering of mercury or sodium ramp lights. Bill D |
#30
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Spinner strobing as a "Bird Strike Countermeasure"
On Mon, 03 Dec 2007 21:52:04 -0800, Airbus wrote:
In article , says... When observed directly under artifical light that "flickers", the most obvious being a strobe light, but there are other types of artificial lights that have flicker. -- Fine - but which ones cause you to see the propellers turning in apparent reverse? Do you frequently operate your airplane indoors? Propellers are usually observed in natural light, which does not flicker. At night, on the rare occasions where you actually see the props clearly, it is from the aircraft's own lighting, which is DC. I have nbever seen the props turning backwards on a real plane - see it frequently in movies though. . . Night, near one of those big off-amber ramp lights, run the RPM up and down, there's a range where it will look like it's going backwards. I thought it was kind of interesting. It's something similar to the poor-man's "is my RPM somewhat right" test, it'll appear stopped at (I forget what RPM now) RPM and if your tach is somewhat near, viola. |
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