4 Channels 5 Servos?
 

Hello...

The 4 * 60 I am currently building uses 5 Servos... Throttle, Elevator, Rudder....... And two for the Ailerons... (On each)

Now how does my 4 channel RC gear control 5 servos...

Obviously you use a Y Harness for the Aileron Servos, but won't this make the Ailerons move in the same direction?

Cheers

Matt

RE: 4 Channels 5 Servos?
 

On one wing you attach the pushrod to one side of the servo control arm and on the other wing you attach it to the opposite side. Just like a plane with one aileron servo has a pushrod attached one to each side of the servo, you do bascially the same but with 2 different servos.

RE: 4 Channels 5 Servos?
 

This should help to clear it up:

RE: 4 Channels 5 Servos?
 

When I wrote the post I had thought about taking a picture, but didnt have batteries charged. But thanks to another MinnFlyer drawing everything is cleared up.

RE: 4 Channels 5 Servos?
 

If you are using a Futaba 4 channel TX with a R127DF receiver, you will find that channel 1 and 7 are the same. Or at least this was the case a couple of years ago.

RE: 4 Channels 5 Servos?
 

Also, down the road, if you want FLAPS on your plane, you can make one aileron servo CH 1 and the other Ch 6 (?). That's if your radio lets you have flaps. ;)

RE: 4 Channels 5 Servos?
 

I think I'm still a bit confused. The drawing (as shown) seems to indicate equal throw for up and down ailerons. Don't we want more up than down? Do you set the end points to enable more up than down? Sorry if this seems obvious, I just want to be sure. Also, you all use a Y-cable to make this happen?

Thanks guys!

Edit: One last question: what does dual ailerons do for you that a single does not? Logically, it seems you've got considerably more control... but a properly configured single seems like it would do just as well. Thanks again!

RE: 4 Channels 5 Servos?
 

If you have a computer radio and dual aileron servos, you can program aileron differential if you choose. If you have dual aileron servos on a 4-channel NON-computer radio, you will need to use a "Y" harness to connect them and the only way differential would be possible is by placing the control horn pivot point behind the hinge line. Dual aileron servos does give you more control authority and also some redundancy should one servo ever fail.

RE: 4 Channels 5 Servos?
 

With a four channel radio and y harness you do not get the luxury of differencial in aileron movement. But if you are flying on a 4 channel radio with a trainer or first low wing aircraft the differencial is not really important. Maybe on a 2nd or 3rd plane when you are trying to hone your skills and fly more precise will you need to worry about that. By that time you will have bought a computer radio anywho.

RE: 4 Channels 5 Servos?
 

Cheers...

Seems obvious enough...

Matt

RE: 4 Channels 5 Servos?
 

One thing no one mentioned is that with dual aileron servos and a computer radio you would also have the benefits of using the ailerons as flaps and spoilers. This would require you using 2 channels on your radio so a 4 channel radio would not work.