Spinner strobing as a "Bird Strike Countermeasure"

"Mxsmanic" wrote in message
...
Maxwell writes:

Guess again.

It wasn't a guess.

Of coarse it is, you prove yourself as clueless as ever. You and your
friend AirBuzz need to do your home work. Your unwillingness to experience
the real world has left you short of observing such a thing with your own
eyes.

Get out of your basement and go to the airport. This phenomenon is apparent
to the naked eye under continuous lighting conditions. You might need to
wait for a three or four blade prop, but it DOES happen in real life.
Something your prove once again you know little or nothing about.

In article , says...



"Mxsmanic" wrote in message
.. .
Roger (K8RI) writes:

At cruise RPM that effect would be completely lost. There's not a
bird or human alive that can discern stroboscopic effects of more than
a couple hundred cycles let alone over a 1000. Most of us can't even
discern 60 cps.

Birds have much better vision than human beings,


Demonstrably true.



and I don't believe
anyone
has tested their ability to discern stroboscopic effects.


You're out on a limb there. There has been A LOT of testing on birds' vision,
and they don't necessarily ask your opinion. . .



And the front
fan
on a turbofan is turning at around 40-50 revolutions per second, not
thousands.



Guess again.


Well, I think he made a pretty good "guess" - the GE90-115B tha powers the
777 turns (front fan) at 2550RPM, or 42.5 RPS. He probably didn't ahve to
guess much, as these facts are easily and irrefutably verified. I "guess" you
haven't learned that. . .

Airbus writes:

You're out on a limb there. There has been A LOT of testing on birds' vision,
and they don't necessarily ask your opinion. . .

Which tests have been done?

Well, I think he made a pretty good "guess" - the GE90-115B tha powers the
777 turns (front fan) at 2550RPM, or 42.5 RPS. He probably didn't ahve to
guess much, as these facts are easily and irrefutably verified.

I obtained the facts from the engine specifications, so no guessing was
required.

On Dec 4, 9:48 pm, Airbus wrote:

And the front

fan
on a turbofan is turning at around 40-50 revolutions per second, not
thousands.

Guess again.

Well, I think he made a pretty good "guess" - the GE90-115B tha powers the
777 turns (front fan) at 2550RPM, or 42.5 RPS. He probably didn't ahve to
guess much, as these facts are easily and irrefutably verified. I "guess" you
haven't learned that. . .

Not too many folks bother to do a little research. It gets
easier all the time, what with Google and all that. Things like fan
speeds are easily available, and with a tiny bit of arithmetic the
rotational speed per second is easily calculated. Some posters just
diss anything someone else says, mostly because they didn't know it
first or perhaps becuase of who is saying it.
There's a well-known phenomenon that can incapacitate pilots. A
propeller spinning so that it cuts through the sun's glare and causes
a stroboscopic effect on the pilot's eyes can result in confusion. A
frequency of less than between 25 and 55 Hz, depending on the
individual, can cause dizziness or nausea. It's called "flicker
vertigo" and the fact that it happens tells me that the human eyeball
(or at least the visual cortex) does have a frequency function of some
sort. 25 Hz on a two-blade prop would be 750 RPM and 55 would be 1650.
Some tests have found that frequencies as low as four to 20 Hz will
induce it rapidly.
See this: http://www.flightsafety.org/hf/hf_mar-apr04.pdf
When I get the prop between the sun and my eyeballs I have to
increase the RPM to get rid of it. It's painful.

Dan

"Mxsmanic" wrote in message
...
And the front fan on a turbofan is turning at around 40-50 revolutions per
second, not
thousands.

My phonograph turns at either 33-1/3 or 45 RPM, which is just as relevant to
this conversation as your mention of turbofans.

Yes - I have a name writes:

My phonograph turns at either 33-1/3 or 45 RPM, which is just as relevant to
this conversation as your mention of turbofans.

At any given moment there are thousands of aircraft powered by turbofans in
flight.

STANDARD FLAME POST version 3.432 (c) 1996-1997. Check all that apply.

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"I am Fudd of Borg. Wesistance is usewess!"

"Mxsmanic" wrote in message
...
Yes - I have a name writes:

My phonograph turns at either 33-1/3 or 45 RPM, which is just as relevant
to
this conversation as your mention of turbofans.

At any given moment there are thousands of aircraft powered by turbofans
in
flight.

Most phonograph records have been replaced by CDs

In rec.aviation.piloting Mxsmanic wrote:
Yes - I have a name writes:

My phonograph turns at either 33-1/3 or 45 RPM, which is just as relevant to
this conversation as your mention of turbofans.

At any given moment there are thousands of aircraft powered by turbofans in
flight.

The Non Sequitur Kid puts in a surprise appearance.

Yet he fails to state that at any given moment there are thousands of
phonographs in use.

--
Jim Pennino

Remove .spam.sux to reply.

On 12/3/2007 8:32 PM Mxsmanic ignored two million years of human
evolution to write:

At any given moment there are thousands of aircraft powered by turbofans in
flight.

At any given moment, you're a total dip****. You also lie a lot.
--
dgs