Servo Grommets wrong way around

[Aviation addict]

Guys,

I've just had it pointed out to me that I've mounted all of my servos with the metal grommet pressed in from the front side rather than the back. I understand that this is the wrong way around. My question is - should I go to the effort of changing them around? When I tightened them originally, I went fairly firm then back about 1/8 turn. Will they be ok or am I significantly reducing the damping effect?

Due to the servo locations I estimate a couple of hours work to change them all around, and thats assuming I don't damage the grommets trying to remove them. Is it worth doing?

[BarracudaHockey]

If you are using servo plates I wouldn't even use the eyelets. (the gromments are the rubber pieces)

They are there so you don't over compress the rubber and do away with any vibration isolation, its up to you. On airplanes the sharp edge of the eyelet can cut into wooden mounting rails and loosen the servo, on most helis that wont happen so I'm not sure I'd worry too much about it but they are backwards.

[DavidH]

The flanged part of the eyelet should go against the mounting surface that the servo is mounted. The non flanged end of the eyelet should be against the head of the screw holding the servo in place.

Use the eyelets when possible. They help prevent from tightening down to tight and compressing the grommets too much. The grommets and eyelets are there to allow the servo to move around some and isolate vibration from the servo.

David

[Aviation addict]

I'm with you David. What I'm saying is that inadvertently I've installed my grommets with the flanged part against the screw. Do you think having the grommets in the wrong way around would make a big difference to the vibration damping?

I'm not using the servo plates. Its just rubber dampers and screws on a Heli.

[DavidH]

Don't know if it would make a difference. It would depend on what the non flanged end of the grommet is resting on. If it is material that the eyelet will cut into, then over a period of time it might make a difference.
When the servo is moving, it is sliding back and forth slightly on the eyelets. So it is puttig pressure on the eyelets.

David

[Aviation addict]

Hi David,

I have the answer - I changed them around to the right way and I believe that the servo becomes much softer mounted i.e. if you try to move the servo case it will move a little (maybe 0.5mm up and down). Before (with the servo mounting screws just hand tight) the servo was pretty much rock solid on the carbon frame.

I feel happier I took the time to change them around.

[Parrich]

Thats not so good, if you can move the servo 0.5 mm you are not gona be able to trim the helicopter

I found i had to trim my heli almost in every flight and that was causing it, i took the eyelet out and now its fine since then.. :roll: