hello there,
well i have a stupid question but am still a beginner
well, my question is that THEY say that most Trainer planes require 4 channels ==> 4 servos .......................... OK
what are the functions of these 4 servos you know like one for throttel control other for flaps and so on, what is teh SO ON here
i usually percepted that a trainer will have at least 5 servos (5 channels)
any elaboration?????
thanx for bearing this basic question...
have a nice day dudes

Channel 1 = Aileron
Channel 2 = Elevator
Channel 3 = Rudder
Channel 4 = Throttle

Maybe 3 and 4 are backward - I can never remember

Channel 5 is typically flaps or retracts - not used on trainers.

thanx CafeenMan
well i was expecting this answer and was preparing questions for it
does the Aileron consists of one servo or two servos (if one how is it biult???)
the second question what does a backward channel mean ????
thanx VERY much for helping me

Ailerons can have as many servos as you want. If one servo then typically the ailerons have torque rods. Torque rods are a wire with a 90 degree bend at each end. The two bends are 90 degrees to each other as well.

In case you aren't aware, ailerons move in opposite directions to make the plane bank.

Another way is to have bellcranks in the wing that are connect by pushrod to the servo and the control surface. Don't see that much any more because most people would put a servo out in each wing for a tighter setup.

By backward, I meant I may have channels 3 and 4 confused as to what they do. In other words, 3 may be throttle and 4 may be rudder. I can never remember. I just plug in servos until the right one moves when I move the stick.

yes.. 3 is throttle and 4 is rudder/ nose wheel steering if applicable after 9.5 yrs.. i still have to think about it!

GraupnerFan - Does that cat have a sniper rifle? If so, is he available for a job?

that was nice
This means that i have two optins: either have one servo for the Ailerons centered in the mbetween the two halves of the wing, right ??? ( is there a certain servo for this job, i mean with higher torque or something???)
OR
two servos on eon each wing, but in this case how would i manage to move both at the same time in opposite directions.
Am almost 90% done with my first plane and am setlling on my radio set so dont get bothered if teh questions are basic.
thanx

On JR radios I think the assignment is:
1. Throttle
2. Ailerons
3. Elevator
4. Rudder

In any case, the JR receivers have the functions marked on them so you don't usually have to remember channel numbers..

tell us what plane you're building

If the plane is .60 size or smaller, then a standard servo will be fine for the ailerons. That is unless it is a speed demon or something, but if it's a trainer, then a standard servo is fine.

The standard servos that come with your radio will be fine for the ailerons...

If you are using one servo, this will be mounted in the centre of the wing with a control rod hooked up to each side of the control horn on the servo. When the servo control arms moves, one side will push and the other side will pull, making the ailerons move in opposite directions...

With two servos, you mount one in each wing with a short control rod link directly to a horn on the aileron. With the servos plugged into a Y lead, both servos will move in the same direction when you move the stick on the transmitter. You have to connect the two servos in a mirror image of each other for the ailerons to work correctly.

well, am biulding a 0.60 Trainer almost the same as the Skystar trainer, i guess. and am using an OS MAX .65 LA engine on it.
so you think that a normal standard servo will work for both Ailerons??!!
am eager to hear your comments, and thanx again for helping ))))

Well, that standard servo will work, but it's on the verge of not being enough. You might consider a higher torque servo, but you can get by with the standard servo. Just don't do any power dives.

thanx tiggerinva
this explains it clearly, I now can easily decide which config. I will use, most prop. I will use a single servo config. just as a start ..... trying to reduce the initial cost as much as possible. : D

My first plane was a Superstar 60 with an OS 65LA... 4 standard servos worked fine in it......

C 130:
When you put the servos in the wings, and the servo arms face the wingtips, they will work in opposite directions. Also, don't forget, with two servos in the wings, you have twice as much aileron power than with one. I always think of the servos in order of importance. Ail. el. thr. rud. That way I don't forget. Wish I could remember other things the same way.

It's very simple:
Channels 1, 2, and 4 control how soon you hit the ground.
Channel 3 controls how hard you hit the ground.
nothin' to it

C 130,
though not a complete picture, this may help. Just envision the two rods continuing out to control "horns" on each aileron. Then picture the servo rotating.
Dennis-