Apache gurney flap
Does anyone know why they added a gurney flap to the Apache? It has two on the stabilator, left side down, right side up. Happy how a gurney flap works (black magic clearly), but what did it cure on the Apache and why?
My guess is that it cures tail rotor roll in forward flight as the TR sits higher and higher (in relation to the rotor disc) even with a moving stabilator. Other options might be uneven EFABS, dutch roll. Anyone know any fabled design stories about the Apache?
I have looked at the old closed threads on gurney flaps, and they don't really answer this question.
Thanks in advance
Jeep