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Subject: LTE
 
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shakejkeUser is Offline
JH Newbie
JH Newbie
Posts:2

08/05/2013 2:22 AM  
Can you get into Loss of tail rotor effectiveness in a counterclockwise rotor system with a wind from the right side?
Super PTOUser is Offline
JH Veteran
JH Veteran
Posts:39

08/18/2013 4:34 PM  
That is a very broad question. Did you get into LTE or is this a theoretical question?
shakejkeUser is Offline
JH Newbie
JH Newbie
Posts:2

08/18/2013 5:59 PM  
No, I had a Commercial Student argue with me that you cannot get into LTE with the wind from the left side in a counter clockwise rotor. He says its only from the right. I tired to explain it to him but it didn't matter. He went onto to call his father who is a medic pilot He told me it was just like settling with power but just vertical since it is the tail rotor. He went onto say that even if you did get into LTE with the wind from the left, you can easily get out of it once the tail rotor moves out of the Main Vortex Vortices. I check with some other CFI's and no one has heard of this. The father said it is documented but he has not provided me with that documentation yet.
Copter 504User is Offline
JH Newbie
JH Newbie
Posts:3

09/05/2013 2:02 PM  
I've taught this and argued this as well. LTE from the main rotor disc is a result of the downwash experiencing a wind from the 285 degree-315 degree quadrant of the rotor disc. This pushes the downwash into the tail rotor's downwash and interferes with the tail rotor's ability to produce thrust to the right, therefor mitigating the anti-torque effect of the tail rotor.
Can you get LTE from the right? Sure. The tail rotor is just as susceptible to vortex ring state as the main rotor is. And important to understand also is the fact that how the induced flow enters the tail rotor is going to affect its ability to work properly.
For instance, we know that the main rotor is most effective when we have lateral inflow of air over the rotor disc, (ETL). If we apply that logic to the tail rotor as well, then the more induced flow that is exerted on the tail rotor disc, the larger the vortices can become, and thusly the tail rotor is more susceptible to LTE in more instances than the three traditional LTE circumstances.
Treat flying helicopters like the weather. We can say that we know a lot, can predict a lot and expect certain results, but resist the urge to say that an aerodynamic affect will NEVER, or ALWAYS be a certain way. That's foolish, and will result in more incidents and accidents in our career field at a time when we're doing our best to alleviate them.
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