PPRuNe Forums - View Single Post - Sikorsky Begins Whirl Testing Active Rotor System
Old 28th Aug 2009, 17:34
  #8 (permalink)  
Graviman
 
Join Date: Nov 2004
Location: Cambridgeshire, UK
Posts: 1,334
Likes: 0
Received 0 Likes on 0 Posts
Originally Posted by heli1
Eurocopter are well ahead,already flying active flap technology on an EC135.
Heli1, are there any links / publications on that work? Not that that i doubt your word, i am genuinely interested. I know that ONERA were doing a lot of work on this system recently (using an EC135 rotor system i imagine). The difficulty with the trailing edge only servos, as i recall, is that for the desired lift modification you also get an undesired pitch modification. I had wondered about leading and trailing edge devices to counter this, and maybe also allow twist resonance damping (blades resonate in flap and twist - ideally at well seperated frequencies to avoid flutter).

Mart
Graviman is offline