Need a help in helicopter crash accident (top urgent)

Newbie here, what's ETL and IGE? Thanks...

Jim wrote:
Duh! This video kind of makes the tail rotor question pointless. It is
so obvious the the impact of the tail rotor with the ice caused the
damage to the tail rotor. So I guess the tail rotor was "broke away"
which then contributed to the crash. Looks like what actually happened
may be the helicopter left the sanctity of ground effect prior to
gaining ETL



wrote in message
oups.com...

Hi,

THIS IS TOP URGENT!..

I have a movie with a helicopter accident. The helicopter crew claims
that the
reason of the accident was a damage on the tail rotor blade. My
brother
was a
copilot in crew of that helicopter and I don't have any reasons to
don't believe him and his colleagues. But investigators claim that it
was basically overloading and helicopter was crashed by this reason.

There were some eye-witnesses that saw when helicopter was in hovering
one piece of the tail rotor blade was broke away. After that the crew
worked only for saving lives of passengers and saving machine. But
after questioning by investigators eye-witnesses ceased to remember
this important detail.

Would you help me and the crew of that helicopter?

The tail rotor has 8 rounds per second and the movie has 30 frames per
second.
The blades of tail rotor are invisible on the movie.

1. Is it possible to see blades enough to make a decision on the exact
reason of damage like on this http://www.helis.com/movies/bige005.mpg
2. Is there any other technique which can be helpful to solve this
problem using exist movie.

Sincerely,
Rustam Bogubaev

ETL = Effective Translational Lift - Basically it means that the helicopter
can fly in forward or translating flight (it doesn't have to be forward
persay but I hope you know what I mean) under conditions that it wouldn't be
able to hover.

IGE = In Ground Effect - which is, as I understand it (I'll be corrected if
I'm too far off on this) within 1 to 1.5 rotor diamters from the ground.
This is as apposed to OGE or "Out of Ground Effect." It takes more power to
hover out of ground effect than it does to hover in ground effect.

In the accident that's been discussed here, the helicopter was operating at
extreme altitudes, probably flying heavy, and tried to leave the security of
ground effect before reaching ETL. The result was that it couldn't maintain
altitude, settled to the ground and struck the tail rotor which promptly
disintegrated, then rolled the aircraft up into a ball and burned.

Hope this helps!
Steve R.


"Gary Emerson" wrote in message
...
Newbie here, what's ETL and IGE? Thanks...