Has anyone had trouble getting the two elevators halves to match up throughout there full up and down motion? I tried different linkages. I thought about using a JR Match box, but was told would not work. I was told you need to get the linkages equal lenghts. But how when on the U-Can Do 3D when the servos are offset. Using Hitec servos, new Karbonite gears , not digital on elevators only rudder. The radio is a Futaba T6XAs. Would the 9CAP Futaba radio allow the cure for the problem. Elevators are equal in nuetral position but one half has more up then the other, then the opposite occurrs when down is applied. They still return to nuetral. Seems that because the servos are reversed there is more throw at the opposite endpoints. Would a servo reverser work the allowing the servo arms to both be mounted in the same direction work. I have seen the reveiw in RC Univers and the servos are mounted differentl then in the Manual that came with the plane. Any suggestions would be helpful.

Thanks

i just finished my 2nd ucd60 and used a reverser and both elevators moved equal up and down.all i can think is that you might have one servo arm up and one down? other than that im confused.oh one more thing is if you have your horns mounted off center one way or the other(one different than the other)thats all i can think of. when you figure it out let us know. good luck!!

Hey eddie, do you have a single servo wire connected to a "Y" to 2 of your elevator servos? If I understand correctly, you don't. You might look thru your controller hand book to see if you might be able to set a throw endpoint for that particular servo that you need help with.On my JR652 TX, I have an throw endpoint that I can set the throw for left AND right, AND up and down. On my setup I used a "Y" harness and reversed my own servo instead of buying a reverser and saving weight and $$$ at the same time.

Hope it works out!!!

Joe

Guys,

I do have a Y connector going to the 2 servos, when you hav 2-servos on a Y connector the endpoints are adjusted for both servos at the same time. I think the CAP9 Futaba computer radios, you maybe able to set them up like flaperons in where one aileron is in ch.1 and the other is in ch.6, and that may work then but I do not have that capability on my radio for elevators. I only have a Futaba T6XAs radio. I have been told though it would not matter, you need to get the linkage geometry correct first. The manual shows the servos mounted in the reverse direction, one with the horn facing up and the other facing down. However the RCU review shows them reversed as well, but reversed the opposite direction. I think I need to get both servo horns facing the same direction either both up or both down and with the aid of a servo reverser thrown in the mix. I just hate to but one to find out that I still need to address the geometry issue after buying a servo reverser. I read some of the other threads and read that some of the other guys re-mounted the servos to be mounted equal distance from the elevator halves this requires then some modification to the planes fuse. (NOT IN THE MANUAL) HUH!!!!

Anyway Thanks for your fast response to my questions and I look foward to hearing about what you think abouyt my set up idea.

Ed

Joe,

How did you reverse your servo? did you re-wire it? How did you do it.

Thanks

Ed

hey there Eddie, Yes I did reverse my hitec servo. I went ahead and did it myself with the help from hitecrcd.com and [link=http://www.hitecrcd.com/Support/Faqs/FAQ_servo.htm]this link.[/link] (go to general servo questions)I rewired it according to directions with a good soldering iron and a set of REALLY steady hands. It kinda scared me because I never had done such a thing and it was a brand new Hitec HS-635-BB karbonite gear servo that had never seen voltage. It was really simple. I'd do it again if I really had to, peice of cake. You have to switch red and green wires on the potentiometer, and the orange and brown wires on the motor. Really simple. ALL Hitec servos are the same....except digital, you can program those. ANYWAYS, The servo arms are located on the top of the elevator on mine. So is the builders guide that came with it. I have a couple of pictures but I am haveing difficulty with my puter to put them up on here. I really dont know how you would get equal lengths in the servo arm either, the two servos are in totally different places on the fuse. One is exactly one servo length further forward than the other. What I did was put both servos in place with the servo horn closest to the elevator surface to get a shorter rod, therefore, less weight. The servo horns (both elevator) are both pointing up and at a 90 degree angle with the fuse. Also make sure your horn "holes", where you connect the rod to the horn, are in a verticle line with the control surface hinges. Also both linkages on each elevator half should be in the same "hole" as each other. I know you know this, but I am covering ALL areas......just in case. Make sure you have matching servos on each of the elevator surfaces. If all else fails, try a different servo to see if you get the same result.

Other than that.....I dunno. Hope it works out fer ya!!!!

Joe

Thanks Joe I will give it a try.

Ed

Well I purchased the Expert electronics servo reverser which has centering control. However I still have a problem. Both elevator halves are centered but the left half goes up about 1/4" higher when up elev. is applied and the right half goes down the same amount when down elevator is applied. This is beginning to bug me. I have many years experience but this is my first with dual servos on elevator halves. The horns are located exactly in the same location on each elevator half. the servo arms are also the same. I have them both 90 degrees to the Stab. the angles are the same of the 4-40 rods being used connecting the servos to the horns. The only thing different is that on rod is 1 inch longer then the other. On the servo reverser only one of the servos has the centering capability. When the servos connected, are reversed the same problem still occurrs with the same elevator halves. I think eliminates the servo reverser as a problem but not totally convinced. In looking at the throws , since one servo seems to have a little more travel in both direction. So I swapped the servos for another pair of servos. It seems as if the one of the "Y" channels coming off the servo reverser appears to be giving just a little more throw to the servo connected. Using a T6XAs transmitter, does not have individual endpoint adjustment. That is why I tried the servo reverser. If I had th CAP9 I believe then I would be able to have the servos on to different channels mixed, but with ATV centering and endpoint control and remove the servo reverser and that would work. Sounds like I need the Futaba 9 chan, CAP9 Transmitter. Any ideas or suggestions would be appreciated.


Thanks ElectricEddie

This I think is what your looking for.
[link=http://www.airwildpilotshop.com/MoreInfo-1.asp?title=product&id=241]Click me[/link]

Thanks 3DE looks like good stuff!!!!

Your welcome!

I fly a UCD3D with a T6XAS, and had some of the same issues. I don't know of a way to set up independent elevator control with the T6XAS. I rewired one servo to run backwards, and used no other electronics. Even the slightest misalignment of one or both of the control horns will cause tracking errors at extreme throws. The row of holes in each of the two control horns must be aligned exactly over the hinge line. The other issue I had trouble with was servo centering. If the two servos are not centered exactly alike, they will not track, and, as per an old guy named Pythagoras, the problem will be worst at the control extremes due to the nature of triangles. You can minimize the effect by using the last hole on the longest available control arms on the servos. I went through a lot of grief over this, but it all tracks well now.

Chris
Arvada, CO

man this thing is really wierd !!! i just dont understand because ive had 2 ucd60s and had no problem at all and all i have is a low grade jr631 w/537 servos w/ reverser and made my own pushrods w/carbon fiber rods and h9 long servo arms and all my throws are exactly the same up and down. im rrrreally looking forward to hear the answer to this one. will come in handy in the future! let us know.

I set mine up with 2 servos, no reversing and ran it on channels 2 & 8 in my Futaba Rx and set up Ailivator...

Maybe its the servo reverser. It is an Expert electronics $9.00 servo reverser that I was told was good for the money and that would work. It just seems as if the throw range coming off one leg of the "Y" harness leaving the reverser has a little more throw (approx 1/4") at each endpoint. I will try and measure the actual throw of the two servos out of the plane. Let you know. I also sent this Link to the Smart-Fly Tech page, for their input. Next Futaba and Hitec?

Kepp up the great help talking about with guys who know maybe we can iron this one out.

Thanks

ElectricEddie

The Equalizer II should be exactly what you need. It controls two servos, will reverse either or both and it will adjust the center and endpoints of both servos. Hope this helps.

Thanks I think I will try one.


ElectricEddie