I am setting up a Cessna 182 with flaps and I am using a futaba 9chp tx with multiplex rx, My dilemma is this whenever I turn the the vr switch controlling flaps, one go up and the other flap go down, I do I correct this in the transmitter?? Do I have to purchase a servo synchronizer??

see if i can describe this, how are your servo arms set? both pointing the same direction, ie towards the same wing tip?

One of 2 things.....how are the flap servos mounted? Unlike an aileron servo...flaps need to be the same way In other words the servos need to face the same way or the servo arms need to be on the same side....ailerons are opposite of each other.
Or if you're controlling the flaps through 2 channels reverse the wrong channel
If you made a mistake installing the flap servo I bet you could use a reversing Y to correct the travel

I have a PICA 182 and it has one servo operating the flaps so if it is a single servo your linkage needs to be corrected. I also have the 9-C so if you have two servos operating the flaps then you go into the radio and reverse the servo going up.

I was unsure how to reverse the servo but I am goona go back outside and see if I can make an attempt at this again.

Hi mustangshooter
The change you need to make is a mechanical one, at the servo. Look at how the ailerons are mounted. One aileron must go up while the other one goes down. What would you do, mechanically, to the aileron servos to get both to move up at the same time? Do that type of change to your flaps.You may have to move the servo arm to the other side, or turn the servo over. This all depends on how they are mounted. Take some photos showing the servos and rods, post them here, and you will get the correct advice. Since our models do not require flaps, you may want to postpone using them.

You can fix this with your radio, run 2 different channels to the 2 flaps. There should be a programmable mix that does this, check your menus.

OK, IF!! You have two servos then turn on your radio, push the button that says Mode/Page, at the bottom of the page it says reverse, roll the cursor until the reverse highlights, open this up by pressing the roller that says PRESS. On the right of the screen all your channels come up. Roll the cursor until one of the two Chanel's you are using for the flaps is highlighted, reverse it by rotating the knob until it says NOR or REV, try thew flaps on your plane, if they are both now going up then put that channel back as it was and go reverse the other channel.
If you only have the one servo it has to be done like Villa said. Some people use Y-Harnesses, not needed with your 9-C but if you have one then you may want to buy a reversing Y_Harness.
Hope this is of help. If you go onto the Futaba web site all this is mentioned in the FAQ section and it is in your instruction manual.

How could you not have 2 servos and have the flaps moving in opposite directions ?

I think this issue is whether he/she has the 2 servos plugged into 2 channels or not.

Mustangshooter needs to clarify how his flap servo system is set up. No one can answer his question with the info he has provided.

unless the guy is confusing ailerons with flaps I don't see how this could be anything other than 2 servos running flaps.

If that is the case, plug them into 2 seperate channels (assuming he has an extra channel). he has a futaba 9chp. this tx will support flaps no matter how they are mounted, no need to worry about horns or reversing servos or antyhing like that.

I have an 88 inch 182 that only has one servo for flaps and it's just done/operated with linkage rods, no mystery. If it is two servos it's just a mater of going in and reversing the one going up, again, no big mystery. Very easwy to do with the 9-C.
I find that people that have only operated/assembled ARFs and never built a kit plane don't understand a lot of the mechanical set ups often used in kits. Not a put down, just a fact. My Cessna is an old PICA kit built plane and I'm sure a lot of the set up would be a mystery to anyone that has just gotten into the hobby in the last decade or so.

LOL I bet they don't move in opposite directions!

Problem solved, I had one servo on each flap, I went into the tx and try to reverse but I kept on having the same issue and so I simply add a servo signal reverse circuit and the problem no longer exist, both flaps going in the same direction as I wanted it to do, thanks guys.

Yeah... I've an old but quite nice P-51 with only one servo for the flaps. If you guessed it used bell cranks.. you'd be right. If you'd guessed it is now decommissioned because of flutter allowed by the bell cranks (mostly on the ailerons)... you'd also be right.

I feel bad that the original poster went out and bought stuff, I look back at the thread and many posts made a simple issue seem very confusing.

Anyway mustangshooter it is always nice to have spare gear, you might get into a jam and really need a servo reverser in the future.

There are a couple of ways to solve that problem. You've probably got the flap servos mounted in the wing like you've got the aileron servos mounted. Flipping one of the flap servos over so it's top points the other way would solve the problem without cost. Notice the aileron servos both either point their tops toward the fuselage or toward the tips. They are mounted that way so the ailerons work opposite directions. The flap servos must both point to the left or point to the right for them to move the flaps correctly. Install them that way and you don't need a "signal reverse circuit". What did that cost, btw?

Ugh......

As I said at the beginning, his TRANSMITTER would have fixed this....no need to flip servos or flip arms or worry about bellcranks. All of that talk made the problem seem 10X more complex than it was!!

This could have been fixed at the field in a few minutes. All he had to do was ditch the Y harness he probably had, ensure the 2 servos were on 2 different channels and set up the radio.

Is this disjointed thread typical of the beginner threads? Gosh I feel bad for the guy.