PPRuNe Forums - View Single Post - Eurocopter crash off Queensland north coast
Old 21st Jun 2021, 19:45
  #86 (permalink)  
212man
 
Join Date: Oct 1999
Location: Den Haag
Age: 57
Posts: 6,267
Received 336 Likes on 188 Posts
Originally Posted by Flying Bull
Well 212man,
Why, because with a normal tail rotor you have more or less a straight line between pedal travel and force generated at the tail, while with a fenestron its not only further travel necessary - its also dependent on the speed, cause the aerodynamical fin will take most of the force of the fenestron at speeds above 60 to 70 knots.
That means, that when you slow down, especially under 40 knots, you need to counteract yaw which isn't compensated by the fin anymore with the fenestron.
Ad to that a crosswind component means you need to give a boot full of pedal to stay straight.
It's no witchwork, but you have to know, what you are doing.
If you come from normal tail rotors you need to adopt.
I wasn’t questioning pedal travel difference vs normal TR. I was questioning why you wouldn’t use full control inputs to stop an excess deviation. I have 2,000+ hours on EC155, so have some fenestron experience.
212man is offline