I need help understanding how the 4 channels get hooked up and if I could do anything better.I have a 5 channel Hytec flash 5,5 channel radio. The arf kit wants you to connect the elevators together and work in unison and I guess they want the ailerons to work with the rudder channel? but then how would you use the ailerons on both wings at the same time for landing. What Im hoping is that there is enough room for anouther servo in the tray so I can operate the elevators independantly.I have mix functions on this radio.
then i can use my 5th channel as a flap channel which is a toggle with two positions.
can you use two channels on the flaps?
I was thinking that i could mix the rudder channel to control each each flap for turning but when landing I could throw #5 switch to lower both flaps? Or would this send juice to the rudder channel and not work.?
How would you wire up this bird? with what I have to work with. Thanks for any help.

I am not sure I totaly understand all your question. Let me tell you how it should be set up and mayabe you can catch on. If you have two elevator servos and want to use flaps with aileron than you need to make a decision. With a 5 channel set up you will have to do one of two things. Either use a reverse Y harnes on the two elevator servos and plug them into one channel and have your aile servos on two sepperate channels. Or use a normal Y harnes on the two AILE servos and use a different channel for each ELEV servo.
This is assuming you have two servos for the elevators and one for each aileron. I would use not set up this plane for flaps. The j-3 Cubs land so slowly that flaps are not really needed. So I would mix the elev servos together on the radio and use one channel for each. Then use a Y to plug both aile servos into.
If your set up is different from what I have described please let me know. I don't have this plane and I am not sure how many servos you are using.

David

How big is this model? What is the engine range in displacement? I'm wondering why they recommend two elevator servos. Usually that is done only with very large models.

Daveopam has a good grip on it.


Ed Cregger

I suspect that he is calling the ailerons flaps, Dave.


Ed Cregger

Hi,The plane is big its a 82" span piper cub. They want you to install 5 servos and use 4 channels two servos are on the wing for the flaps.Then they want you to put the outher 3 servos inside ,1 for throttle,1 for the elevators with both of them connected together and rudder on the last servo. what I want to know is would you connect the flap servos to the rudder channel so as you turn ,say right the left flap would go down?
or do you connect the flaps to work along with the elevator so as you elevator up the flaps go down and viser versa

What you are calling flaps are actually the Ailerons. The aileron servos plug into a Y harness and the Y plugs into the RX. The ailerons is what makes the plane bank. Most models do not use rudder to turn. A Cub will make a smoother turn if you use rudder and aileron together. It is not needed but will make a more scale turn.
Please don't take this the wrong way but you need a lot of help. You really need someone local to help you and show you how it is done. I could talk you through it but if you try and fly it by yourself it will crash. Not maybe crash but will crash.

David

Sorry it takes me so long to get back, I understand now what your saying,pluss ive been reading up on my radio system ,its been a while.I just was woundering if I should have the ailerons mixed with the elevators,or mixed with the rudder. Only thing is if both ailerons are tied together with a Y connection can they still operate independantly.
along with the ruder mixed in. Im still confused back to the book plus once the servos are in the plane I can see better what im doing. Thanks for your help.

If you plug the two aileron servos to a y-harness and then into channel 1 on your receiver, they will move the the correct way in
relation to one another for ailerons. Just make sure that they are moving the "Right Way" Do a bench test with them and you'll see. I have a Sig 1/4 scale clipped wing Cub that I fly with one elevator servo,(70 oz ) Have never had any problems. I have flown a 1/4 scale full wing Cub and it does not like to turn on ailerons alone. As one of the guys stated eariler Cubs turn better when you add rudder. I would not mix the aileron and rudder at least until you have test flown the plane and are comfortable with it. then you could experiment with mix if you like. To me, using rudder and aileron independently on this bird will get you used to using the rudder in the air. But thats only my opinion. I put my first big wing cub in on the first flight because I didn't know about the rudder thing. I got help and was glad I did. Good luck Impalas

Thanks for your help,What I was saying though if you have 2 aileron servos operating each flap can one go down and the outher go up and viserversa .when they both tie into one channel with a y connection or would they both go down or up together. when turning and mixing with the rudder? If im a pain sorry just like you said it would be better just to hook it all up and bench test it.The radio is complicated and my short term memory dont mix lol

The answer to your question is yes. These are ailerons, they are not flaps. Set the two servos on the bench with the receiver and plug them in through a y-harness. Put two servo arms on them and you will see the movement of the arms. One will be pushing the control linkage and the other will be pulling. impalas

Georgee, Just make sure the top of the aile servos are both facing in or both facing out. If you have them mounted upright then make sure both arms from the servos are pointing in or out. This makes the ailerons work opposite of each other. This is how most planes with two aile servos are set up. This way you don't need any mixing.

David

daveopam is right. Just make sure you use the aileron servos set up facing out or both in so that the opposite side of each is used. They will then move the ailerons in different directions. You would need a 6 channel radio to use the ailerons separately, without a Y adapter. With this Cub you could mix a little rudder in with the ailerons. When the ailerons move, the rudder would move about 20% mix in the direction of the turn. This will overcome the "adverse yaw" that a Cub has. It will however fly without this mix.