Вот что на эту тему пишет Берт:
The Goblin uses soft dampers, the dampers need to be preloaded to set the proper tightness of the head. The dampers are preloaded using shims.
For some reason during the release of the 630, the preload was not set correctly on some helicopters. This is easily fixed by adding more shims, bag #14 includes the shims needed.
Use common sense, on any DFC head, you need to run very tight dampening, simply increase the preload by adding shims until the head is tight!
We're currently working on releasing a non DFC head, the new head will be optional and available for sale to those who prefer a conventional swash follower type design. We don't have a release date at this time, but we're very close.
Вкратце, суть проста:
- не будьте лохами и думайте моцком: любая башка DFC должна
иметь плотную и жёсткую посадку шпинделя в демпферах,
ежели шевелится - добавьте шайбы.
- вскорости SAB выпустит опциональную башку классической
конструкции для тех, кому башка DFC не нравится по религиозным соображениям.