That is it, thanks Nick. That explanes a lot.
So, in general it counteracts that "nose left", when applying right pedal and so, making a heli more stable around the longitudinal axis during turns at lower speeds.
But doesn't the downwash of main rotor somewhat disable the flow around the fin - especialy at lower speeds?
I'm not sure about Vmin IFR on 412, but i will check.
Our AB-212 was built in Italy, and it came with that fin from the factory.
Last edited by Phoinix; 12th June 2004 at 15:05.