Sheffield Today 04/02/07 1500hrs
Join Date: Nov 2007
Location: Yellow Brick Road
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This is not an uncommon occurence in the H269/S300 series, being a fully articulated rotor head. I wish I jumped on this thread earlier.
After 2 minutes at 2500 rpm, if you roll off too quickly down to 2000 rpm before closing the throttle, ground resonance can develop, quite independently of the oleos. Snappling the throttle off can upset the hunting interval of the main rotor blades and it only needs one blade out of sync to offset the CG of the rotor disc, hence the violent rocking from side to side.
After 2 minutes at 2500 rpm, if you roll off too quickly down to 2000 rpm before closing the throttle, ground resonance can develop, quite independently of the oleos. Snappling the throttle off can upset the hunting interval of the main rotor blades and it only needs one blade out of sync to offset the CG of the rotor disc, hence the violent rocking from side to side.
