What Dampeners???

[dedados]

Never had that, will fly today at 1700 and see how it goes, going to the field now.

[dedados]

no wobble at all HSs, flies better now, nailed the piroflips, they were very funky before with the soft dampeners.

[dr dremel]

[madeye]

Originally Posted by dr dremel

My "wobble" was an oscillating rotor disc @ roughly 2Hz. The rotor disc tilts in a circular/fore-aft/side-to-side movement.

Interestingly enough, after last rebuild (including the rotorhead) my MiniP gained very similar behavior, except that the only time it'll do it will be in fast forward flight - never in hover, not noticeable when banking, and it'll only do it in fore-aft plane. The amplitude gets scary at times. I wrote about this before, and was under impression that it was fixed, but today's flight showed that it's still there.

- All the new rotorhead components, nothing is bent, no vibrations, smooth as silk
- Elevator cyclic gain dropped - changed nothing
- Head dampening reduced as possible - no effect
- Reseated the FBL on a softer pad - no effect, if not the opposite

Wonder what do I have to check next. Swashplate? Cyclic servos?

Originally Posted by dr dremel

Heres a video, although wrongly described as "tail wag", which it is not. It´s the typical low head speed wobble:

T-Rex 500 tail wag at first hover - YouTube

[dr dremel]

Have you checked blade grip bearings? Thrust bearings in the right orientation? Shim between thrust bearing and normal bearing?

Have you changed blades after rebuild? I sometimes get a hint of this when flying FB style blades (light blade, inward CG).

If everything mechanical checks out ok, the "dolphin effect" or purposing in FFF should be tunable via FBL. It is a different behavior than the low HS wobble though.