Ya beat me to it Kevin! ;-)

Great links though. I hadn't seen them before.

Thanks & Fly Safe,
Steve R.


"The OTHER Kevin in San Diego" skiddz "AT" adelphia "DOT" net wrote in
message ...
On Tue, 06 Sep 2005 20:20:24 GMT, Gary Emerson
wrote:

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

ETL - Effective Translational Lift. Basically, the rotor disc can
generate more lift with any horizontal movement of air across the
disc. This movement can be from wind or horizontal movement. It
happens with *ANY* horizontal flow, but it's effects begin to be felt
somewhere in the neighborhood of 16-24 kts. (Depending on the text
you're reading at the time)
http://www.copters.com/aero/translational.html

IGE- In Ground Effect. When hovering within approximately 1/2 rotor
disc diameter of the ground, the rotor wash "bounces" off the ground
and the tip vortices come back down through the rotor disc,
effectively increasing the angle of attack and therefor the amount of
lift. Helo performance numbers will reference hover in and out of
ground effect.. In ground effect you'll be able to hover at a higher
altitude than out.
http://www.copters.com/aero/ground_effect.html

(Excellent site BTW. Easy to understand and lots of diagrams)