OK,
The covering is done and I started unpacking all the servo's etc. and
looking at the setup. My first question is....

The servo arms that come with the Hitec HS-5945MG servo's look
pretty heavy duty and I am wondering if they are safe to use?

I see a lot of people talk about Dubro Heavy duty arms... but if
I am not going to aluminum arms what makes the dubro arms better
then the ones supplied be Hitec?

Thanks for the help

I'll see what I can do without getting into any trouble.

The large servo arms that come with the newer Hitec digitals are supposed to be made from the same stuff that the karbonite gear trains are made of. It's allegedly stronger and stiffer that what had been previously available from other manufacturers. Dubro is one of the "other manufacturers".

In any case, it's not the best idea to surface mount a ball link to any of the plastic servo arms. They will all twist under the right loads, and many will eventually break under those conditions. Aluminum arms are a better choice if the use of ball link hardware is selected.

Well put.

I have used the heavy Hitec plastic arms with ball links without failures. However keep in mind that I rarely fly a plane more than a couple dozen flights before moving on to something else.

The trick is the keep the ball link mounted as close to the surface of the arm (the thick one) as possible to keep torsional forces to a minimum.

TF

Hideho,
I'll take a wee stab at this...while I have a 3 inch alum arm on my rudder servo, (pull-pull in fuse) I've used the heavy duty karbonite arms for over 200 flights on my WHEdge without any problems whatsoever.
I'm not an IMAC flier, just all out 3D....I haven't noticed any slop or non-repeatability in my servo function.
Hitec 5945's in the wings and elevators.
Just my experience.

Thanks guys,
I decided to not let 60 bucks stand in the way of a perfect setup,
so I ordered the SWB double lock horns.

smart move... will also work on the next bigger? model??

Gerald