aeajr
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What Goes on Which Stick?
by Ed Anderson
aeajr on the forums
If you are flying an RTF electric plane, your radio and servos are already set-up for you. However if you are setting up an ARF or finishing a kit, you will be installing your own radio equipment. So, which stuff goes on which stick, and why?
We usually talk about what surface is controlled by what stick. However,
that is not really the right way to look at it.
First, the control axis:
Pitch - nose up/nose down - usually controlled by the elevator or elevator function of elevons
Roll - rotation of the wings around the fuselage - controlled by ailerons or the aileron function of elevons.
If the plane does not have ailerons or elevons, then roll can be controlled by the rudder or the rudder function of a V tail rudervators, depending on the design of the plane. On rudder only planes the rudder works with dihedral in the wings, the upward slant of the wings, to roll the plane.
Yaw - movement of the nose left or right - controlled by rudder or the rudder function if V tail ruddervators.
Speed - throttle control
If you are in a different part of the world, you may be flying mode 1, 3 or 4. I live in North America where Mode 2 is the standard, so the rest of this post will be referencing mode 2 control positions.
Note that I mention Mode 2, which is marked with the * below.
Left stick ...............Right Stick ..................Mode
Pitch and Yaw .......Speed and Roll ..............1
Speed and Yaw*......Pitch and Roll*..............2*
Pitch and Roll ..........Speed and Yaw ...........3
Speed and Roll ........Pitch and Yaw .............4
For a power plane, landing gear, flaps and other such functions are assigned
to switches, buttons, dials, sliders or levers, but are not defined as part of the mode definitions.
For a two stick radio, used in mode two format, the standard format in North
America, pitch and roll are on the right stick with roll ALWAYS being your
primary turning control. Yaw and speed control are on the left stick.
Based on mode 2 it is very easy to move from a dual stick to a single stick radio as the right, or the only stick, always have has your primary fight controls if pitch and roll.
Primary Speed control
Since this is written for electric flyers, we will assume you have an electric motor. On a two stick radio, the speed control is on the left stick and is controlled by the motion that goes toward you to turn the motor off and away from you to give full throttle. For a single stick radio the throttle control is usually on the left side and will be a slide, switch or lever.
Where does the rudder go?
Confusion often exists around where to put the rudder. Depending on the design of your plane, the rudder can play different roles so its placement can change. On a three channel electric plane without ailerons, the rudder is your primary turning surface. It provides both roll and yaw control so it goes on the right stick for roll control, as the primary turning surface. This stick also has pitch control provided by the elevator. The rudder will work with a feature of the wings, called dihedral or polyhedral, to roll or bank the plane when you want to turn.
What if there are ailerons, or elevons?
Primary flight controls of pitch and roll are always on the right stick, or the only stick. If this is a 3 channel plane with throttle, aileron and elevator controls only, like a flying wing that has elevon controls (combined elevator aileron in one surface), now where do I put things? Think of function rather than surface and you will know immediately. Which surface provides roll control? In this case it is the ailerons, so they go on the right stick with the elevator which provides pitch control.
If this is a 4 channel plane that has ailerons and a rudder, the ailerons are your primary roll control, so they go on the right stick. The rudder moves to the left hand stick to provide yaw control, which helps the ailerons turn the plane smoothly.
If you are flying off a runway, the rudder can be very valuable as it helps control your path down the runway during take-off and landing. If you have a steerable ground wheel it is usually attached to the rudder or the rudder channel. The rudder, in this configuration, also plays a valuable part during landing when we may wish to redirect the nose of the plane without tipping the wings using the ailerons.
Moving from single stick to dual stick radios
Some people feel it is confusing to move from a single stick radio to a dual stick, radio, however, if you are flying mode 2, it really isn't confusing at all. If you think of your radio and your controls in this manner, there is no confusion moving back and forth between single stick and dual stick radios or between three channel R/E/T planes and A/E/T planes or planes that are A/E/R/T.
On a single stick radio, pitch and roll are on the single stick, which happens to be oriented to the right side of the radio. If this is a dual stick radio, pitch and roll are still on the right hand stick. It doesn't matter if it is a rudder/elevator plane or an aileron/elevator plane. Pitch and roll are on the right stick, or the only stick.
Think of your controls this way and there is never a doubt what goes where or which controls to use when you switch between radios and planes.
I hope this was helpful.
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President, Eastern Soaring League www.flyesl.com
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