After a mishap while working on my 4*40 wing (dog getting in the way and to avoid stepping on dog stepped on the wing) I am building a new wing and want to put in dual servos. I asked about this once before and one suggestion was to put two servos in the center but i really hate torque rods. I would like to mount them in a bay with a hatch. For standard servos do I need to make new hardwood ribs if I am going to use hardwood rails to moung the hatch to? Or would reinforcing the balsa ribs with lite ply and using hardwoord servo rails be better?? I think I'm also going to sheet the leading edge of the wing to help stiffen it up. Also I'm guess adding hard points to the ailerons would be good if I put the servos in the bay

Chris

On Bruce Tharpe's web page is a pdf file that shows exactly how to do what you want. Bruce, if you don't know is the man who designed the Four Star 40 and 120.
http://www.btemodels.com/venture.html = Venture page
http://www.btemodels.com/Downloads/vt_dualaileron.pdf = PDF file
John

I use both option 1) and 2) on the second link above. If you have room, you can make a variation of 1) by dropping the pads below the plate. It will require some more structure, but the servo doesn't stick out so much. In effect, you make a recessed mount.

I have used both methods shown on Bruce Tharp's site. The internal mount, Option 2, is how the aileron servos are done on the 4*60. There are a couple of companies that sell plastic and carbon fiber mount plates for this method.

If it didn't come in the kit, I use Option 1 because it's easier and I have never had a problem with this method. Some times the servo on the left side will get oiled, but again, I have never had a servo problem with the oil.

As a matter of fact, I am amazed at how durable servos are. I squirt 409, Windex, whatever is handy all over these external mount servos to get the oil off and have never in many years of RC flying have I had a servo failure due to this.

Not to mention that helis throw oil and dirt all over themselves and all their servos are exposed. When I got my Raptor, one of the first things I tried to figure out is how to keep the oil off the servos. The answer is you can't. But they still work fine assuming they're somewhat sealed.

I don't like my servos hanging out in the breeze though. Makes me feel like my plane is aerodynamically challenged.