Jayson Tita
There you go.
EM
On the 49th
Thé Mulindwas Communication Group
"With Yoweri Museveni and Dr. Kizza Besigye Uganda is in anarchy"
Groupe de communication Mulindwas
"avec Yoweri Museveni et Docteur Kiiza Besigye, l'Ouganda est dans l'anarchie"
From: mwanan...@yahoogroups.com [mailto:mwanan...@yahoogroups.com] On Behalf Of
Prof. Reuben H Simoyi
Sent: Saturday, February 25, 2012 6:40 PM
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Subject: Re: [Mwananchi] NOW THIS IS VERY STRANGE INDEED
EM;
Thanks. This would not happen to a new chopper. Any car, bus, tractor, gets
'loose' with age. You start to hear some noises you never heard before when it
was new. A chopper is one of the most violent rides ever (even with two
rotors.. it is still one noise bone-rattling ride). The driver of the chopper
should have eased off the throttle and tried again to re-lift off. Choppers
would always pass through this destructive frequency as it ramps up its engine
power. The good thing is, you do not stay at this frequency for long and you
transition to a less destructive frequency of vibration. This chopper just
stayed at this frequency for just too long.
Prof.
PS
I can't stop watching it. I keep watching it over and over again. Remarkable
teaching tool in our field.
Ishe komborera Africa (Enoch Sontonga, 1897)
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From: "Herr Edward Mulindwa" <mulin...@look.ca>
To: mwanan...@yahoogroups.com
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Sent: Saturday, February 25, 2012 2:30:50 PM
Subject: [Mwananchi] NOW THIS IS VERY STRANGE INDEED
Professor Reuben H Simoyi
And this might sound a stupid question, is there steps we can take to prevent
it from happening? Was there a human error somewhere? For with the explanation
you have given out, I am simply scared to sit in a Heli.
By the way thank you for throwing a light on it for it simply baffled me when I
read it.
EM
On the 49th
Thé Mulindwas Communication Group
"With Yoweri Museveni and Dr. Kizza Besigye Uganda is in anarchy"
Groupe de communication Mulindwas
"avec Yoweri Museveni et Docteur Kiiza Besigye, l'Ouganda est dans l'anarchie"
From: mwanan...@yahoogroups.com [mailto:mwanan...@yahoogroups.com] On Behalf Of
Prof. Reuben H Simoyi
Sent: Saturday, February 25, 2012 5:16 PM
To: mwanan...@yahoogroups.com
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greatla...@yahoogroups.com; ugandans-at-he...@googlegroups.com;
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Subject: Re: [Mwananchi] NOW THIS IS VERY STRANGE INDEED
A rare but remarkable action of synchronization. As it was on the ground, the
rotors generated a specific vibrational frequency that synchronized with the
general frequency of vibration of the whole chopper. Same thing would happen
if an army tries to march in formation over a bridge. You can easily bring the
bridge down by generating this unique frequency that is cooperative which keeps
getting enhanced. We use that in chemical dynamics all the time: a specific
unique frequency can generate a reaction (destruction of the chopper), while
several other frequencies are incommensurate and lead to nothing other than the
noise the chopper makes. If the chopper was not sitting on the ground, it
would not have disintegrated because it would wobble and not give any series of
frequencies any cooperativity.
Prof
PS
Going to use this video in my dynamics class next year!!
Ishe komborera Africa (Enoch Sontonga, 1897)
_____
From: "Herr Edward Mulindwa" <mulin...@look.ca>
To: ugandans-at-he...@googlegroups.com, uganda...@yahoogroups.com,
ugandanet@kym.net, mwanan...@yahoogroups.com,
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Cc: "Rwandanet Rwandanet" <rwanda...@yahoogroups.com>,
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Sent: Saturday, February 25, 2012 12:45:26 PM
Subject: [Mwananchi] NOW THIS IS VERY STRANGE INDEED
Copter self-destructs while still on ground
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