Odd Noise on my 480's Savox SH1290MG

[oliver1071]

Originally Posted by GregCA

That's the same thing I see with my 1290MG. It holds fine in punch outs and all flying, even backwards, but there is a slow, small wag (~1 cm tail movement) in a hover, especially in wind. Since it flies fine, I just ignore it. If it ever annoys me too much, it's good to know that the MKS will cure it.

Definitely puts the polish on this great heli. I probably would have kept it on as well even with the noise. But doing a lot of winter flying and the odd movements started to annoy me since most days are windy now. I am really impressed at the difference now. Not a single bobble twitch or movement.

Must be Savox my G380kse was running a Savox tail servo and had the same goofy behavior swapped it to a Cheap KST servo and it's also solid.

[GregCA]

Originally Posted by GregCA

That's the same thing I see with my 1290MG. It holds fine in punch outs and all flying, even backwards, but there is a slow, small wag (~1 cm tail movement) in a hover, especially in wind. Since it flies fine, I just ignore it. If it ever annoys me too much, it's good to know that the MKS will cure it.

Last week I did install the MKS DS760P. It's the same servo mentioned above except the upper case is plastic to save a little weight. It cured the tail wag in a hover I was seeing with the 1290MG and it flies great. To be fair, the 1290 also flew great with crisp piro stops and great hold in punch outs and fast backwards flight. I just couldn't get it to stop hunting in a hover.

[oliver1071]

Originally Posted by GregCA

Last week I did install the MKS DS760P. It's the same servo mentioned above except the upper case is plastic to save a little weight. It cured the tail wag in a hover I was seeing with the 1290MG and it flies great. To be fair, the 1290 also flew great with crisp piro stops and great hold in punch outs and fast backwards flight. I just couldn't get it to stop hunting in a hover.

Very cool glad you got it worked out. It's definitely more polished with a good tail servo. That MKS is pretty impressive for a low voltage servo. It's strange that my G380 did the same exact thing with a savox tail. I don't know what it is that makes them hunt while hovering.

[jogeiremil]

Maybe the 1290's suffer from poor centering?
This would explain the wag in hover. My 9 align DS610's (which is a rebranded savox) has so much slop when powered up, that they are useless on FB-helis. I can only use them on FBL systems. Funny thing is, then dont have as much slop when they aren't powered up.

[jogeiremil]

Update on noise

On My 50cc Sbach 342 I have savox 1256tg on all control surfaces.
Left aileron servo started whining after some flights. I opened the servrotoday and lubricated the gears - did not help. Then I took of the bottom cover and lubricated the motor through a small hole in the printed circuit board - success!

The brass bearings on the motor needs lubrication, maybe the factory forgot?

I used yamalube 10w40 fully synthetic delivered by a small syringe. (maybe 1/10 of a drop did the trick)

So, this time the sound came from the non drive end bearing in the motor. Last servo I serviced which had the same sound, I lubricated only the gears, and the motor went quiet. I must have spilled some oil into the drive end bearing that time.