MotionRC Detrum GAVIN-8C Owner's manual

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Motion RC Supplemental Guide for the
Detrum GAVIN-8C
Transmitter
Version 1.0

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Motion RC Supplemental Guide for the Detrum GAVIN-8C Transmitter
Contents
Review the Transmitter’s Controls ................................................................................... 1!
Review the Home Screen ................................................................................................. 2!
Power the Transmitter ...................................................................................................... 3!
Calibrate the Transmitter .................................................................................................. 3!
Create a Model ................................................................................................................. 4!
Bind a Receiver to a Model .............................................................................................. 5!
Configure a Throttle Hold Switch ...................................................................................... 6!
Prepare to Program an Airplane ....................................................................................... 7!
Program Servo Direction .................................................................................................. 8!
Program Servo End Points ............................................................................................... 9!
Program Servo Sub Trim ................................................................................................ 10!
Program Dual Rates and Expo ....................................................................................... 11!
Set the Switch to Control Channels ................................................................................ 16!
Configure a Gyro ............................................................................................................ 17!
Set Timers ...................................................................................................................... 23!
Perform a Range Test .................................................................................................... 24!

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Motion RC Supplemental Guide for the Detrum GAVIN-8C Transmitter Page 1
This guide provides instructions to help you program the Detrum GAVIN-8C for an airplane.
Additional information can be found in the manual included with the radio.
Review the Transmitter’s Controls
1. Power switch—push the switch up to turn the transmitter on.
2. Status light—illuminated when the transmitter is turned on; flashes when in range test
mode.
3. Trim buttons—push to set the trim for the associated channel.
4. Control sticks—control the channel to which they are connected.
5. SA, SB, SD, SE switches—three-position switches that can be used for a variety of
functions.
6. SC switch—a two-position switch that is spring-loaded; when held against the spring, the
transmitter passes control to another transmitter to which it is connected. You also use

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this switch to bind the transmitter to a receiver.
7. SF switch—a two-position switch that is usually used for retracts.
8. Display screen—displays different pages of information while you are controlling a
model or programming the transmitter. After a time of inactivity, the screen dims. Press a
button to return the screen to full brightness.
Review the Home Screen
1. System timer—how long the transmitter has been turned on.
2. Battery status—how much charge remains in the batteries by percentage and icon.
3. AIL, ELE, and RUD Dual rate status—These indicators show the dual rate setting
currently applied to each of these channels.
4. Hold indicator—when HLD is displayed, throttle hold is on and the motor won’t spin
when throttle is applied; when NORM is displayed, the throttle is active.
5. Percent of throttle—indicates how much throttle is being applied.
6. Timer 1—displays a countdown or count up timer, typically triggered by throttle or
HOLD switch position. When the timer expires, you hear a tone and the timer flashes.
7. Timer 2—provides a second timer with the same capabilities as timer 1.
8. Trim indicators—the shaded part of the trim indicator indicates how much trim is applied
to the associated channel and in which direction. When you are setting trim, the
numerical value is displayed at the end of the trim indicator.
9. Active model—you see the name of the active model, which means the model that can be
flown or programmed.

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10. UP button—use this to highlight options on the screen when you program the transmitter.
11. DOWN button—use this to highlight options on the screen.
12. EXT button—press this to move back to the previous screen.
13. ENT button—press this to select a highlighted menu option. You also use it to enter
range test mode.
14. R/+ button—press to increase values when you are programming the transmitter (hold
down to rapidly scroll through options).
15. L/- button—press to decrease values when you are programming the transmitter.
Power the Transmitter
1. Remove the battery cover from the back of the transmitter.
2. Install 4 AA batteries per the diagram in the battery well.
3. Replace the battery cover.
4. Push the power switch on (up). The transmitter turns on, the home screen appears, and
you are ready to calibrate the transmitter.
Calibrate the Transmitter
1. When the home screen is displayed, press the ENT button.
2. Use the UP or DOWN buttons to highlight System Set.
3. Press the ENT button.
4. Use the UP or DOWN buttons to highlight Calibration and press the ENT button.
5. Move both sticks through their full range of motion top to bottom and side to side (you

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can move them at the same time or individually). You see a representation of the stick
motion and positions on the screen as you move the sticks.
6. Place both sticks in their neutral positions.
7. Press the ENT button. If successful, you see the “Completed!” message on the screen. If
not, repeat these steps until it is calibrated successfully.
Create a Model
1. From the home screen, press ENT.
2. Use the UP or DOWN buttons to highlight Model Set and press the ENT button.
3. Use the UP or DOWN buttons to highlight Model and press the ENT button.
4. Highlight the position of the model you want to create, such as MODEL02 and press the
ENT button.
5. Highlight Name and press the ENT button.
6. Press the Up and DOWN buttons to select the character of the existing name you want to
change; the current position is marked with a square.
7. Press the R/+ and L/- buttons to choose the character you want in the current position.
You can choose from UPPERCASE letters, lowercase letters, numbers, or special
characters. Hold the R/+ or L/- buttons down to rapidly scroll through the available
characters.
8. Press the Up or DOWN button to select the next position.
9. Press the R/+ and L/- buttons to choose the character you want in the current position.
10. Repeat steps 8 and 9 to complete the model name. You can choose the space character to
“erase” an existing character.
11. Press ENT to save the new name.

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12. Highlight Type and press ENT.
13. Use the Up or DOWN buttons to highlight the kind of model you are creating, such as
AIRPLANE, and press ENT. (This guide shows an airplane model, you can configure
other types using similar steps.)
14. Press EXT twice to return to the home screen. You should see the name of the model you
created on the screen, indicating it is the active model.
Bind a Receiver to a Model
1. When the home screen is displayed, press ENT.
2. Select Model Set and press ENT.
3. Select Model and press ENT.
4. Highlight the model you want to bind to the receiver and press ENT. The model you
selected becomes active.

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5. Press EXT twice to move back to the home screen.
6. Turn the transmitter off.
7. Connect the receiver to at least one servo and to the ESC.
8. If you are using a receiver that has a BIND port, follow steps 9 and 10; if you are using a
receiver with a Bind button, follow steps 11 and 12 instead.
9. Insert the Bind plug into the BIND port.
10. Power the receiver by connecting a battery to the ESC. The Bind light on the receiver
flashes indicating that it is in Bind mode. Skip to step 13.
11. Power the receiver by connecting a battery to the ESC. The Bind light flashes rapidly.
12. Hold the Bind button down until the Bind light flashes more slowly.
13. Hold the SC switch in the forward position (toward the front of the transmitter) and turn
the transmitter on. You hear the bind tone on the transmitter and the Bind light on the
receiver becomes solid, indicating the bind process is complete.
14. Move the control associated with the servo you connected to ensure it moves. If so, the
model is bound. If not, repeat this process until it is successful.
15. Power off the receiver and remove the Bind plug (if applicable).
16. Power off the transmitter.
Configure a Throttle Hold Switch
You should have a throttle hold switch on the transmitter that disables the throttle to minimize
the chances of an accident due to a prop or EDF spinning unintentionally.
1. Turn the transmitter on and use steps 1-5 in the previous task to select the model you
want to program. Confirm that the model you want to program is shown on the home
screen.
2. Press ENT.
3. Select Func Set and press ENT.

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4. Select THR Hold.
5. Use the Up or DOWN buttons to select the switch you want to use for the throttle hold
switch. If the plane you are programming doesn’t have retracts, put the throttle hold on
the SF switch because it is a two-position switch. If the model does have retracts, you
should use one of the other switches.
6. Press EXT twice to return to the home screen.
Prepare to Program an Airplane
1. Connect the ESC to the THRO channel on the receiver.
2. Connect the aileron, elevator, and rudder servos to their respective ports on the receiver.
3. Connect the retracts to the GEAR port.
4. Connect the flap servos to the AUX1 port.
5. Turn the transmitter on and use steps 1-5 in the “Bind a Receiver to a Model” task to

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select the model you want to program. Confirm that the model you want to program is
shown and has been bound to the receiver.
6. Check to ensure HLD appears on the home screen, indicating the throttle hold is active; if
you don’t see HLD, move the throttle switch that you set in step 5 of the previous task to
the opposite position; if you are using switch SF, this requires one click while if you
selected one of the three-position switches, you need to move the switch through two
clicks. HLD should appear on the home screen, which means the throttle is inactive and
programming the model is safer because you won’t get unintended prop or EDF spinning.
If HLD doesn’t appear, perform the steps in the previous task to ensure you have
configured a throttle hold switch.
7. Connect a battery to the ESC. You should hear the startup tones from the ESC and see a
solid light on the receiver.
8. Ensure that a spinning prop or EDF is not a safety hazard, set the throttle switch to the off
position (NORM appears on the home screen indicating the throttle is in normal
operation mode), and slowly advance the throttle to ensure the motor spins.
9. Return the throttle hold switch to the on position so the motor no longer spins; you see
HLD on the home screen.
10. Systematically check each control surface for movement including rudder, ailerons,
elevator, flaps, and retracts. You can change direction and amount of movement later,
now you are ensuring the transmitter can activate the controls correctly.
11. After you’ve confirmed all the model’s controls are working, you are ready to do the
detailed programming of the model.
Program Servo Direction
1. Set the correct direction for each servo using the Rev Set function; to access this from the
home screen, press ENT, select Model Parameter, press ENT, select Rev Set, and press
ENT. You move to the Rev Set screen where you see the current servo direction (Norm
or Rev) for each channel. You also see a visual representation of the channel’s position
and direction of motion on the right side of the screen. The numbers on the far right are
the current trim setting for the channels.
2. Check the direction of motion for a control surface, such as the elevator. If the direction
needs to be reversed, perform step 3; if not, skip to step 4.

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3. Select the channel for the control surface (such as CH2 for the elevator), and press the
R/+ button. The direction setting changes from Norm to Rev and the servo moves in the
opposite direction.
4. Check the direction of motion for another control surface, such as the ailerons.
5. If the direction needs to be reversed, select the corresponding channel on the Rev Set
screen and press the R/+ button.
6. Repeat steps 3 and 4 until you are sure all the control surfaces move in the correct
direction.
7. When you’re done setting direction, press EXT three times.
Program Servo End Points
When you set the end point for a servo, you determine the maximum amount it can move within
its normal range of motion. For example, when the end point is set to 100, the servo can move
though 100% of its normal range of motion. If you set the end point to 120, the servo moves
through 120% of its normal range of motion.
You use end point to determine the maximum position of servos. For example, if a servo is
binding when its end point is set to 100, you can reduce the end point so the servo doesn’t try to
move past the control surface’s limitations.
1. Set the range of motion for each servo using the End Point function; from the home
screen, press ENT, select Model Parameter, press ENT, select End Point, and press
ENT. You move to the End Point screen where you see the current range for each
channel indicated by the LOW and HIG settings for each channel. LOW indicates the
negative side of the range while HIG indicates the positive side. Each range can be set
between 0 and 120.

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2. Select the channel and range of motion you want to set, such as CH1 LOW.
3. Press R/+ to increase the range in that direction (the maximum is 120) or L/- to decrease
the range (the minimum is 0).
4. Select the other direction for the channel you selected in step 2, such as HIG.
5. Press R/+ to increase the range in that direction (the maximum is 120) or L/- to decrease
the range (the minimum is 0).
6. Repeat steps 2-5 until you have set the range of motion for all of the channels you are
using.
7. Press EXT three times to move back to the home screen.
Program Servo Sub Trim
Sub trim sets the position of the servo when its controlling stick is in the center position. Sub
trim is often used when the servo arm isn’t exactly perpendicular to the servo when it is in the
neutral position to ensure there is equal movement in both directions. (Before using sub trim, you
should physically set the control arm as close to perpendicular as possible by removing its screw,
rotating the arm, and the securing it with its screw.)
1. From the home screen, press ENT, select Model Parameter, press ENT, select Sub Trim,
and press ENT. You move to the Sub Trim screen where you see the current sub trim (a
value between -100 and 100) for each channel.

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2. Select the channel for which you want to set sub trim, such as CH1.
3. Press the R/+ button to set the sub trim in the positive direction or L/- to set it in the
negative direction until the servo arm is where you want it to be when its control is in the
neutral position.
4. Repeat steps 2 and 3 until you have set the sub trim for all of the channels you are using.
5. When you’re done setting sub trims, press EXT three times.
Program Dual Rates and Expo
The dual rates control enables you to determine how far a control surface moves for the same
amount of stick movement. You can use dual rates to make control surfaces move less for the
same amount of stick motion, making the control less sensitive. For example, if a plane banks
too much too quickly, you can choose a lower rate to make the ailerons move less for the same
amount of stick movement. You can also use dual rates to make control surfaces move further
for the same motion, making the plan more responsive.
Following are a couple of situations in which you might want to use dual rates:
• You’re flying a plane for the first time and aren’t sure how much control surface
movement you want to have. You can have the option of less control surface movement
in case you find the full control movement to be too much. You can choose a lower rate
to calm the plane down while you get used to it.
• You want to have multiple flight “modes.” You can use the lower rate settings when you
are just cruising around, during takeoff or landing, or at other times when you want the
plane to be less sensitive to your control inputs. When you are doing aerobatics or just
want more control, you can move into the higher rate settings.

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The GAVIN-8C supports three levels of “dual rates” (the term dual rates comes from the time
when radios could only support two rate settings; a more accurate name in today’s world is
multiple rates). You can enable or disable dual rates for the ailerons, elevators, and rudder
channels individually. And, you can put the dual rates for all three channels on the same switch
or use different switches for each channel. (In most cases, you want to use the same switch for all
channels to keep things simpler.)
You can configure the range of motion of each control surface in each dual rate setting, which
are referred to as DR0, DR1, and DR2.
Expo (short for Exponential) changes the relationship between movement of the control sticks
near their center positions and the corresponding movement of control surfaces. Without expo, a
control surface moves in direct proportion to a stick’s motion, i.e., if you move a stick 25% of its
range, the corresponding control surface also moves through 25% of its range. With expo
applied, the control surface does not move in linear proportion to stick movement; expo can be
positive or negative.
Positive expo means the control surface moves less with the same stick movement near its center
position, e.g., if you move the stick to 25% of its range, the control surface moves less than 25%
of its range. Positive expo makes a plane’s controls less sensitive to stick movements near the
center position, making the model less “twitchy” (meaning that it is overly sensitive). With
positive expo, the plane doesn’t react as quickly to stick movements near their centers, which is
the area you primarily use during “normal” flight (takeoffs, landings, basic turns, etc.). As you
move sticks further from their center positions, the control surfaces move exponentially more
and the plane reacts more quickly to further control inputs; this is the area you use when
performing aerobatics (when you want more control surface movement).
The more positive expo you apply, the larger is the range of motion of the sticks with less
sensitivity.
The amount of expo you should use depends on the model you are flying and your personal
preferences. You can often find suggested expo settings for a model in its manual. If not, you can
use some general guidelines as a starting point: for a high-wing trainer, expo settings between 10
and 20 are usually a good starting setting while for an aerobatic plane or EDF (jet), expo settings
of 30-40 are typical.
Negative expo increases the sensitivity of control surfaces to stick movement; negative expo is
typically used by advanced pilots to perform extreme maneuvers. Negative expo is not
recommended unless you are a very experienced pilot.
Expo is usually used in combination with dual rates. For example, when you have a higher rate
selected (meaning the control surface moves more), you typically want more expo than when a

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lower rate is used.
On the GAVIN-8C, you can set expo on the primary flight control surfaces (ailerons, elevator,
and rudder) for each dual rate setting (DR0, DR1, and DR2). For example, on many models, you
want more expo when the ailerons are on their highest rates and less when the rates are lower and
you typically want more expo on the ailerons than on the rudder.
The rate and expo being used for a control are both determined by the same switch—you can
configure the switch used for the rate and expo setting for each of the primary control surfaces.
1. To configure dual rates and expo, from the home screen, press ENT, select Model
Parameter, press ENT, select Stick Curve, and press ENT. You move to the AIL Curve
DR0 screen where you set the maximum amount of aileron movement and relationship
between the aileron stick movement on the transmitter and the aileron servos when the
aileron rate is set to position 0.
2. Press DOWN to select EPA (End Point Adjustment).
3. Press the R/+ button to increase the maximum amount of movement or L/- to decrease it.
As you change the EPA setting, the graph on the right side of the screen shows the
maximum position (where the curve intersects the vertical line).

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4. Press DOWN to select EXP.
5. Press the R/+ button to increase the amount of expo or L/- to decrease it. As you apply
expo, the graph on the right side of the screen shows the amount of expo applied. The
“sharper” the curve, the more expo is applied.
6. When you are done setting rate and expo for the aileron with the rate set to the 0 position,
press ENT. You move to the AIL Curve DR1 screen.
7. Select EPA (End Point Adjustment).
8. Press the R/+ button to increase the maximum amount of movement or L/- to decrease it.
9. Press DOWN to select EXP.
10. Press the R/+ button to increase the amount of expo or L/- to decrease it when the aileron
rate is set to position 1.
11. Press ENT. You move to the AIL Curve DR2 screen.
12. Repeat steps 7 through 10 to configure the rate and expo settings when the aileron rate

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switch is in position 2.
13. Press ENT. You move to the ELE Curve DR0 screen.
14. Repeat steps 2 through 13 to set EPA and Expo for the elevator when its rates are in the
0, 1, and 2 positions and the EPA and Expo for the rudder when its rates are in the 0, 1,
and 2 positions.
15. When you are done setting rates and expo, press EXT two times to return to the main
menu.
16. Select Func Set and press ENT.
17. To activate dual rate for the aileron, select AIL D/R and press the R/+ or L/- buttons until
the switch you want to use to activate dual rates is shown. You can use any of the SA-SF
switches to activate dual rates; choose OFF if you don’t want to use dual rates on a
channel. If you choose SF, which is a two-position switch, you toggle between positions
0 and 2 (settings for DR1 are not used). You can use a switch even if it already being
used for another function. In most cases, you want the dual rate switch to be used only for
dual rates.
18. To activate dual rate for the elevator, select ELE D/R and press the R/+ or L/- buttons
until the switch you want to use to activate dual rates is shown or select OFF to disable it.
You can use the same switch for all dual rates, which is the most common configuration.
19. Repeat step 18 to enable dual rates for the rudder channel, if desired.
20. Press EXT three times to return to the home screen.

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21. Change the position of the D/R switch (or switches if you are using more than one
switch) to change the rate and expo being used for each primary control surface. You see
the current setting next to AIL, ELE, and RUD (D0, D1, or D2) on the home screen. If
you hold a control stick in its maximum while you flip the D/R switch, you see the
impact of the rate change on the amount of movement (the expo setting is also being
used, but it is more difficult to see its impact).
Set the Switch to Control Channels
As you’ve seen when setting rate and expo, you can change the switch that controls channels on
the receiver. For example, if a plane has retracts, you want to control them with SF because it is a
two-position switch. You can use the following steps to associate a switch with a channel:
1. From the home screen, press ENT.
2. Select Func Set and press ENT.
3. Select the channel you want to configure, such as GEAR.

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4. Press the R/+ or L/- buttons until the switch you want to use to control the channel is
shown.
5. Repeat steps 3 and 4 to configure the controls for other channels. For example, if flap
servos are connected to the AUX1 channel, set the switch you want to use to control the
flaps. (If you are using a Detrum MSR66A receiver with built-in gyro, the gyro is
controlled by the switch associated with the AUX1 channel so you can’t activate the
control without changing the gyro setting. You need to choose the control position and
gyro mode associated with each position of the switch.)
Configure a Gyro
A gyro provides automatic control over a plane to make it easier and more fun to fly. For
example, a gyro can counteract the effects of turbulence on a plane by automatically applying
controls to keep the plane flying smoothly. Or, you can activate the auto-recovery mode to put a
plane in a straight and level orientation as a means to help you recover when you get into a tough
situation.
Some receivers, such as the Detrum MSR66A, include a built-in gyro that you can configure in a
number of ways:
• Gyro off. In this mode, the gyro is turned off and doesn’t do anything.
• Normal. When in the Normal mode, the gyro counteracts external forces on the plane.
For example, if the plane encounters a gust of wind that would normally make the plane
bank, the gyro activates control surfaces to keep the plane level. This mode is useful for
general flying as it limits the impact of wind and other external conditions on the plane.
• Auto-recovery. When this mode is active, the gyro returns the plane to a straight and
level attitude. It is most useful for recovering the plane when you lose orientation or get
into a position that you aren’t able to recover from. Activating this mode returns the plane
to level flight, potentially preventing a crash.
• Aerobatic. In this mode, the gyro attempts to hold the plane in its current orientation.
This is especially useful when you are performing aerobatics, because once you put the
plane in the desired orientation, the gyro attempts to hold it in that position. For example,
if you perform a knife edge, the gyro attempts to keep the plane in that orientation.
• Gain. The gain is the strength of the control the gyro provides to the channels it is
controlling. The larger the gain, the more control the gyro applies. If the gain is set too
high, a control surface can oscillate, which can cause the plane to fly erratically and
potentially crash. If the gain isn’t set large enough, the gyro won’t have enough control.

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The only way to know how much gain you need is by flying the plane and making
adjustments based on how it flies with the gyro active. Start with the gains set to their
default levels. If you observe oscillation, such as in pitch, you should decrease the pitch
gain. If the gyro seems to be having little to no effect, you can increase the pitch gain.
Changes to gains should be made in very small increments and always based on flight
performance.
• Mounting. The gyro needs to be correctly oriented with the plane to perform correctly.
This setting identifies how the receiver is mounted in the plane.
• Wing Type. This setting enables the gyro to control various configurations, such as
standard ailerons, delta wing, or v-tail.
• Offsets. The offset is used to counteract differences between the receiver’s mounting
position relative to the plane’s roll and pitch axes when the Auto-recovery mode is used
(the receiver should be aligned with the plane’s axes as much as possible). For example,
if the gyro isn’t exactly at 0 degrees bank when the plane is perfectly level and the Auto-
recovery mode is made active, the plane matches the bank angle of the receiver rather
than the plane. You can adjust the roll offset so that when the Auto-recovery mode is
active, the plane has zero bank and is perfectly level. You can also adjust the offset for
the pitch axis. Like the gains, you should leave the offsets in their default settings and
adjust them based on flight performance. Changes to the offsets should also be done in
small increments.
On the Detrum MSR66A, the AUX1 port is tied to the gyro. You can’t use this port
to control something on the plane, such as flaps, and the gyro modes
independently. If you want to use flaps, you’ll need to associate a specific gyro
mode with each position of the flap switch and the flap position and gyro mode will
always go to together. For example, you might want the gyro to be in Auto-
recovery mode when flaps are fully deployed, but in Normal mode when the flaps
are in the other positions. You can also set the gyro to be in the same mode, such
as Normal, regardless of switch position so that it will be active all the time while
the flaps are set according to the switch’s position.
You can configure a receiver with the Detrum MSR66A gyro directly with the GAVIN-8C
transmitter as follows (different models of receivers may have slightly different steps):
1. From the home screen, press ENT.
2. Select Func Set and press ENT.