Conor M Marr

US Patent:

20150093245, Apr 2, 2015

Filed:

Apr 5, 2013

Appl. No.:

14/389847

Inventors:

- Cary NC, US
Mark Jolly - Raleigh NC, US
Conor M. Marr - State College PA, US

International Classification:

B64C 27/51
F16F 9/504

US Classification:

416106, 416145

Abstract:

A method for controlling helicopter ground resonance and air resonance motions as well as centrifugal force switching dampers are disclosed. A helicopter lead-lag damper () has a first ground resonance motion damping rate stage (FDR) and a second air resonance motion damping rate stage (SDR). The damper () includes a centrifugal force switch (). The damper () is oriented relative to the rotary wing rotation axis () and helicopter blade (). An in-flight rotation rate of the centrifugal force switching damper () actuates the centrifugal force switch () with the damper switching from the first ground resonance motion damping rate stage (FDR) to the second air resonance motion damping rate stage (SDR).