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No moving tail, only ailerons?

#1
Imagine a standard plane, tractor configuration. you normally use servos to control the angle of
1) the two ailerons
2) the rudder
3) the elevator

So, could you get by without 2 and 3? In other words, if you only controlled the ailerons (in an elevon configuration), and the whole tail was fixed and unmoving, would the plane still be controllable? Would the plane turn up and down properly, if the ailerons moved up and down together?

Just curious. Thanks!
 

leaded50

Legendary member
#2
depending on plane, how much control it would give by elevons.
2 & 3 goes good together, so do 1 &3 too, but then no turncontrol on ground.
 

Merv

Legendary member
#5
..... In other words, if you only controlled the ailerons (in an elevon configuration), and the whole tail was fixed and unmoving, would the plane still be controllable?....
My guess is no, I don’t think that plane would be controllable.

If you have a fixed horizontal stabilizer, it would make the elevons ineffective.
If you removed the horizontal stabilizer, then it would work.
 

Hai-Lee

Old and Bold RC PILOT
#6
If you make the plane into a canard it will work quite well using only the servos controlling the wing "Elevons"
See the canard Tiny trainer from a 4 1/2 years ago. It had a fixed horizontal stabiliser / Foreplane and a fixed vertical stabiliser.
https://forum.flitetest.com/index.php?threads/tiny-trainer-based-canard-anyone.29171/
It flew quite well and once the handling became familiar it was very docile and could not be stalled in the normal sense.

Have fun!
 

Monte.C

Legendary member
#9
Yeah that's how you fly a wing. But I'm completely with @Merv, with a tail attached it will nullify your attempts at elevator/pitch control.

Yes of course as a canard it will work, but that's a very different plane.
 

Hondo76251

Legendary member
#10
Maybe it would work if you had a lot of up angle on the motor. Power would make it climb, trim it to have a nice glide path under idle or no power...
 

Merv

Legendary member
#11
I agree there are many ways to make a fixed tail plane fly. The easiest way is to set a slight up elevator in the fixed tail, then control the altitude with the throttle. Add in twin motors & use differential thrust & you've got a controllable plane, no servos at all. Many toy planes use this approach.

I just don't think you can do it with elevons. It might be possible to do with flaperons. What is the difference you ask. It's the direction the surface moves to go higher. With elevons, to go higher, the control surface moves up. With flaperons, to go higher, the control surfaces would need to move down.

In my thinking, this difference is similar to ailerons vs. Vtail. The first time I setup a Vtail, I was thinking ailerons & my Vtail was reversed.
 
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sprzout

Knower of useless information
Mentor
#12
Imagine a standard plane, tractor configuration. you normally use servos to control the angle of
1) the two ailerons
2) the rudder
3) the elevator

So, could you get by without 2 and 3? In other words, if you only controlled the ailerons (in an elevon configuration), and the whole tail was fixed and unmoving, would the plane still be controllable? Would the plane turn up and down properly, if the ailerons moved up and down together?

Just curious. Thanks!
So, what you're asking about is if you have a vertical stabilizer, using elevons on a wing, would the plane be controllable?

Sounds like you're talking about something like this, mayhap? I know it's set up in a pusher configuration, not tractor, but it sounds to me like you're describing something like the Goblin.

 

L Edge

Elite member
#13
You stated you wanted to use the ailerons only(in an elevon config) and tail is fixed and unmoving. Is it possible? Answer is YES!!!

What you do is make a special elevon in the main wing. Here is a picture of how it is made.

bottom pivot.jpg


Your moving control is divided in half so it pivots. I used 2 carbon rods, one fits inside the other where one is glued to the elevon and the other to the wing. Add servo and ready to go .

bottom up.jpg


It is set up so the prop or just airflow can be deflected above and below that you set up as elevons

This is a top view.
bottomtop pivot.jpg


This is your top view. Concept is based on 1/2 elevon is above and the other below.

I glued the rear elevator so it doesn't moves. Hence the flight.


Here is another exploring a tilted wing (CL-84) where I had to keep the fuse and tail level. So tail had a gyro added to rear elevator and not hooked to elevon control so the fuse would always be level and the wing is fixed at 33 degrees.
Had same elevons in main wing to get it to fly. Look at 6 seconds and see them move. Love that tip stall.

 
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