Cox servos, any users?

Yes, I have enough screws laying around already, so that's quickly solved, it is just strange that the supplied ones are not long enough.

It is the brass tubes that are the real issue, they are simply too short and the vibrational damping will not work as intended. I guess I can make new ones in lathe but that I can do for any other servo too...

I bought several from Bernie a while back. Only one was put to work, on the throttle of my .049 Cub. The servo does its job well but it doesn't take much to strain it.

I agree the supplied screws are too short. I picked up some 3/8" mounting screws from the LHS.

Well, I dug out my Cox servos and a DragonFly Servo...looks like twins, cox is red with yellow arms, dragonfly is yellow with red arms. I can color coordinate!  Both have the Brass eyelets with rubber bushings and same size screws. I mounted both to a Popsicle stick and the screws just penetrated thru and stuck out 16th of inch before bottoming out on the brass eyelet. I also pushed a standard servo screw theu the rubber bushing and it almost penetrated the wiring harness,  so becarefull if you substitute the Standard servo screw for the shorty's shipped with the micro servo.  



IIRC the only function of the brass eyelet is to keep the screw from crushing the rubber bushing and elimination of the vibration cushion it provides.
If you can fabricate those on a lathe...wow, my hats off to you.

Marleysky wrote:
IIRC the only function of the brass eyelet is to keep the screw from crushing the rubber bushing and elimination of the vibration cushion it provides.

Yes, the brass eyelet is what the screw should tighten down on, without crushing the rubber.
I've found a pair of eyelets on another old servo, these are about twice as long and will do just fine.

Here is what it looks like, proper length on the left hand side;

These COX servos were one of my early buys from Bernie a couple years ago and they did not last for too long. They cannot be steained as much as other similar servos because they simply fail.
I just bought 6 from Bernie at discounted price.

I have installed one as a throttle servo now, but the movement is a little slow and erratic.
I wouldn't dare to put that anywhere else than on a throttle...

Don't try this at home!

Thanks for all the inputs. I bought about 6 of these from the Estes surplus store until they closed over 10 years ago. They are limited in power, were used on small electric RTF planes, which tells me that their power is very limited. I've got two on my Minnie Mambo, for throttle and rudder. Thought I'd use the same on my 46" Berkeley Impulse build on the same channels, but may boost the rudder to an 8 or 9 gram servo, leaving only the Icon servo for throttle. I can live with a throttle servo failure, but not on a flight surface.

I'd think them best for 1/4-A stuff. When I get a chance to fly the Minnie Mambo, will know more if they are appropriate or not. Rudder is small enough on it that I think it should hold up without an air balance on it.