3DHS Slick eating Savox 1270TG servos

[njswede]

Today I noticed severe flutter on the tail surfaces on high speed passes. I checked the surfaces and it seems the linkages are tight, but the servos have a significant amount of slop. I think the problem may be that I have single servos on the tail surfaces and while the torque is enough, they may just be too weak from a longevity point of view. (Disclaimer: This is a second hand plane, so I didn't build it with single servos. I would probably have put tandem servos on...)

Any input/ideas?

 

[Robotech]

Today I noticed severe flutter on the tail surfaces on high speed passes. I checked the surfaces and it seems the linkages are tight, but the servos have a significant amount of slop. I think the problem may be that I have single servos on the tail surfaces and while the torque is enough, they may just be too weak from a longevity point of view. (Disclaimer: This is a second hand plane, so I didn't build it with single servos. I would probably have put tandem servos on...)

Any input/ideas?

What brand arms are you using? I have had some of the "bling" arms get sloppy.

 

[njswede]

I think they're spot-ons. Gotta check the arms. Would be nice if it was just the arms and I didn't have to get new servos.

 

[Bunky.F.Knuckle]

Go in a hole on the servo arms on the elevator.

 

[nebwake]

Go in a hole on the servo arms on the elevator.

I had the same problem on my 87" extra. Went in a few holes on the arm and it solved it. The servos just didnt have the strength.

 

[Bunky.F.Knuckle]

What size plane is this?

 

[njswede]

Oh, sorry. Forgot to mention that in the title. It's a 104" 3DHS Slick with a DLE120 in it. It's got tons of power and the 27x11 it's swinging makes it pretty fast too.

 

[Husker]

Are you running HV? Those servos are pretty weak(comparatively)on 6v.

As the others said...the longer your arm is the more leverage the surface has to fight against the servo. It is like using a breaker bar on your servo.

 

[njswede]

Yeah, I'm running them HV. I thinking it's the arms and not the servo. Once I work up the energy to get everything out of the trailer, I will check!

 

[njswede]

When I win the MKS777 servos, I'll put them in and see if they do any better.