Vlift said:
"oleos" will contribute to ground resonance. It's a constant consideration on the 269 and has been since 64' when the U.S Army started buying them.
Nick sez:
Gosh, vlift, the oleos prevent ground resonance! If you think they cause it, we'd just remove them!! Please don't try that, you won't get one complete rotor engagement before the parts made terrible noises and scattered across the ramp.