FUTABA GV-1 User manual

33
33
3
GOVERNOR FOR MODEL HELICOPTER
GV-1
INSTRUCTION MANUAL

44
44
4
Thank you for purchasing a Futaba GV-1 governor.
To ensure safe use, please read this manual thoroughly before
using your new governor. After reading this manual, store it in a
safe place.
FOREWORD
The GV-1 is an engine governor for model helicopters.
The governor automatically maintains constant rotor R.P.M.due
to load changes (reaction to torque) by suppressing variations in
the engine speed. The GV-1 works very well in all maneuvers,
from hovering to flying.
-Engine speed can be set from both the GV-1 and the transmitter.
-A magnetic sensing system reads the engine speed.
-Fuel mixture control can be set.
-An LCD panel displays the engine speed and set data.
-No part of this manual may be reproduced in any form without prior permission.
-The contents of this manual are subject to change without prior notice.
-This manual has been carefully written. Please contact Futaba if you feel that any cor-
rections or clarifications should be made to the contents of this manual.
-Futaba is not responsible for the results of use of this product by the customer.

55
55
5
TABLE OF CONTENTS
PRECAUTIONS 6
Definition of symbols 6
Setting precautions 7
Operating precautions 9
BEFORE USE 10
Set contents 10
Nomenclature 11
Overview of GV-1 operation 12
Examples 14
ASSEMBLY & ADJUSTMENT 16
Mounting the magnet and sensor 16
GV-1 connections 21
Fuselage setting precautions 22
FUNCTIONS 24
LCD display and edit keys 24
Low battery alarm 24
Function map 25
Initial setting for governor operation 26
Description of functions 33
REFERENCE 47
Specifications 47
Glossary 48
GV-1 PARAMETERS SHEET 49
REPAIR SERVICE 50

66
66
6
PRECAUTIONS
PRECAUTIONS
To ensure safe use, please observe the following precautions.
Definition of symbols
Pay close attention to the parts of this manual indicated by the following sym-
bols.
Symbol
Indicates a procedure that could result
in serious injury or death to the user or
other persons if ignored and not per-
formed properly.
Indicates a procedure that could result
in death or serious injury to the user or
other persons, as well as physical
damage, if ignored and not performed
properly.
Indicates a procedure that may result
in serious injury to the user or other
persons, or physical damage only, if ig-
nored and not performed properly.
Meaning
Graphic symbols
; Operations that must not be performed.
; Operations that always must be performed.

77
77
7
PRECAUTIONS
Setting precautions
When using the GV-1 for the first time, or when making
changes in the throw of a servo, always perform the limit
setting operation.
(Setting method: Page 45)
Always set battery fail safe function at the GV-1.
(Setting method: Page 44)
Since the GV-1, when used, controls the throttle, the battery fail safe function
that is in a PCM transmitter will not be used.
Because the GV-1 controls the throttle, the throttle channel
fail safe function normally set in a PCM transmitter will not
be used. Set the fail safe function as described below.
Transmitter setting
Use the fail safe function for the channel that turns the governor on and
off to set the fail safe position to the point at which the governor is
turned off. With this setting, when the system enters the fail safe state,
the governor will be turned off and the receiver throttle signal will be
output directly.

88
88
8
PRECAUTIONS
The center of the sensor is
different from the center of
the sensor case so be careful
when mounting the sensor.
(Setting method: Page 16)
2.2
mm
3.7mm 3.7mm
Center of sensor
is offset.
Sensor
case
When using the PCM1024Z transmitter
When using the condition hold (CHD) function, always set the
throttle servo maximum operating point (MAX THR) to 20% or
less.
Depending on the conditions, this setting will turn on the governor and
prevent the engine from exceeding the set speed even when condition
hold is set.
(Governor ON conditions)
The following conditions must be performed, to turn on the
governor:
-Governor ON/OFF switch set to ON position.
-Throttle stick set to 20% or more from slow position.
-Engine speed raised to 70% or more of set speed.

99
99
9
PRECAUTIONS
Operating precautions
At the beginning of flight, keep the governor in the OFF
state by setting the throttle stick to no more than 20% from
the slow side.
While the engine is running, turn on the governor at the point which the throttle
stick is at least 20% from the slow side and the engine speed exceeds 70% of
the set speed.
When the model is on the ground, lower the pitch to the
position at which the model does not try to lift off. Do not
take your eyes off the model.
When the governor operates and the rotor speed increases the lift also in-
creases causing the model to try lift off , depending on the pitch position.
Periodically check the sensor output.
(Check method: Page 46)
The magnet rotates at high speed and is subjected to a large centrifugal force.
Check the sensor output and mounting state about once every 10 flights.
If the model begins to shake during operation, immediately
turn off the governor.
(See "Governor on/off operation mode setting" on page
29.)
When engine speed is not stable at high R.P.M.'s
The carburetor design, etc. may cause the engine to operate
unstable. If this occurs, lower the maximum speed setting to the
range over which there is no problem.

1010
1010
10
BEFORE USE
SENSOR THRO MXTR
r.p.m 1 r.p.m 2 r.p.m 3
m.trim GOV on GOV off
on / off
Tx
GV-1
& Sx SENS.
r.p.m THRO
m.trim
BEFORE USE
Set contents
Immediately upon opening the carton, check if the following items are sup-
plied.
Miniature screwdriver
GV-1 control amp
GV-1 magnetic sensor
Magnet
Sensor mounting stay
For 30 engine
For 60 engine
Seal
Sensor mounting screws

1111
1111
11
BEFORE USE
SENSOR THRO MXTR
r.p.m 1 r.p.m 2 r.p.m 3
m.trim GOV on GOV off
on / off
Tx
GV-1
& Sx SENS.
r.p.m THRO
m.trim
Nomenclature
Control amp
LCD display panel
Displays the speed and set data. Sensor connector
Servo connectors
Receiver connectors
Edit keys
Used to set data. Press with the accessory miniature
screwdriver.
LCD contrast trimmer
The display contrast can be adjusted so that the LCD display is easy to
read. Adjust the contrast with the accessory miniature screwdriver.
Seal
Stick this seal to the sensor and servo connec-
tors, transmitter switch, etc.

1212
1212
12
BEFORE USE
Overview of GV-1 operation
The GV-1 operates from 1000 to 2100rpm main rotor speed . However, the
engine must be running at the set speed. The GV-1 turns off the governor
when the engine is starting or idling.
*Governor operation = Operation that stabilizes the engine speed at the set speed.
When governor turned on and off by switch (Normal
condition)
Setting the switch to the ON position turns on the governor. The following
describes this operation.
-Throttle stick set at least 20% from slow posi-
tion and engine running at 70% or more of set
speed ->->-> ON
-Throttle stick set to maximum slow position ->-
>-> Remains ON
-Switch set to off position ->->-> OFF
When governor turned on and off by transmitter
throttle stick
Governor can be turned
on and off by a switch.
100%
0%
15% or less
(OFF region)
(OFF at slow side)
The data is set so that the governor can be turned on and off with the trans-
mitter throttle stick. The following describes this operation.
-Throttle stick set at least 20% from slow side
and engine running at 70% or more of set
speed ->->-> ON
-Throttle stick held at 15% or more from slow
side ->->-> Remains ON
-Throttle stick lowered 15% or more from slow
side ->->-> OFF
(Governor operating point)
Set speed
20% or more of stick deflection
and 70% of set speed

1313
1313
13
BEFORE USE
For safe operation, do not turn on the governor under the conditions
shown below. If satisfied while the governor is on, the following condi-
tions will forcibly turn the governor off.
When the governor is off, the transmitter throttle stick controls the
throttle servo.
-Engine started while governor switch in ON position.
-Engine speed is 70% or less of set speed and throttle stick is set to
20% or less from slow side after engine started (governor starting
only).
-Speed set to 999rpm or less (OFF setting).
-Stick signal is lower than stop position setting.
-Engine stopped, or sensor signal abnormal.
-Throttle stick set 15% or less from slow side (only when function
that turns governor on and off by stick is set).
The following operations do not indicate trouble:
(When engine speed rises above the set speed)
A near-vertical dive may cause the engine speed to rise above the
set speed.
(Throttle operation speed and ON/OFF point)
If throttle operation exceeds 70% of the set speed and the rotor
speed rises to the set value, the ON/OFF point may seem to differ
with the operating speed. Delay operation to smoothen the switch-
ing operation causes this and does not mean that the ON/OFF point
has changed.
(Deviation from set speed)
The GV-1 stabilizes the engine speed to within +1% of the set
speed. For example, if the rotor R.P.M. is set to1500rpm, the Rotor
R.P.M. speed will deviate about +15rpm. However, this poses no
problem from the standpoint of practical use.

1414
1414
14
BEFORE USE
1
2
3
OF
F
O
N
OF
F
1
3
OF
F
2
3
Examples
The GV-1 functions can be selected to match the transmitter used.
Select the functions by referring to the examples shown below.
Function
Speed
switching Governor on/off Mixture function Connection
Example 1
Three
positions ON/OFF
None Throttle servo
Not connected
CH7(example) CH8(example)
When used with PCM1024Z
2P switch channel
3P switch channel
Throttle channel
Sx
Rx
Sx
Rx
Sx
Rx
Example 2
Speed
switching
position 1
used None Throttle servo
Not connected
Two positions
CH7(example)
When used with FF8 or PCM1024Z
(without mixture function)
Not connected
3P switch channel
Throttle channel
Example 3
Speed
switching
position 1
used
Throttle servo
Mixture servo
Two positions
CH7(example) Mixture
control used Volume channel
3P switch channel
Throttle channel
When used with FF8 or PCM1024Z
(with mixture function)

1515
1515
15
BEFORE USE
on/off
OF
F
O
N
ON/OFF
Function
Speed
switching Governor ON/OFF Mixture function Connection
Example 4
None None Throttle servo Not connected
Speed set at
governor side. 2P switch channel
Not connected
Throttle channel
Example 5
None None Throttle servo Not connected
Speed set at
governor side.
Throttle stick
Not connected
Not connected
Throttle channel
When there is no vacant channel
Sx
Rx
Sx
Rx

1616
1616
16
ASSEMBLY & ADJUSTMENT
ASSEMBLY & ADJUSTMENT
Mounting the magnet and sensor
Modify the cooling fan and install the accessory magnet and attach the mag-
netic sensor to the engine at the position shown below.
Magnet and sensor mounting
Cooling fan Magnet (Embedded in cooling fan.)
Sensor (Attached to engine
flange through a stay.)
When installing the sensor
magnet to the muffler side,
also refer to the needle side
mounting.
Sensor center position
Offset the sensor
center position. Sensor case
Align the sensor center position and the
center of the magnet shown in the figure
at the left.
2.2
mm
3.7mm 3.7mm

1717
1717
17
ASSEMBLY & ADJUSTMENT
Direction of mounting the
sensor to the stay.
The sensor and stay mounting directions depend on the
sensor mounting position.
Magnet mounting position
Magnet
Distance from center
of engine shaft
Cooling fan
Magnet mounting method
The tables below show the magnet mounting position (example) for each en-
gine. 60 engine 30 engine
Mounting
position Distance from
center of
engine shaft
Mounting
position Distance from
center of
engine shaft
Needle side Needle side
With a Kyosho 60 helicopter, do not use a stay. Mount the sensor directly to the
helicopter frame.
27.1-28.8mm 22.0-24.0mm

1818
1818
18
ASSEMBLY & ADJUSTMENT
Magnet direction check
(Magnet operating side check)
When a battery is connected to the servo
connectors, the control amp is activated.
(Control amp)
+
-
Servo
connectors Sensor
connectors
Sensor Magnet
1Connect the sensor to
the control amp.
2Connect a battery di-
rectly to one of the servo
connectors.
3Press the FUNC+ or FUNC- key
until the "sensor percentage"
screen is displayed
4Bring the magnet near the end
of the sensor and check the op-
erating side.
This is the side at which the displayed value increases. Install the magnet
with this side facing the sensor. Mark this side of the magnet with a felt tip
pen.
Sensor mounting
The sensor mounting method depends on the helicopter and engine.
1Mount the sensor to the sensor stay. (Temporary
assembly)
2Drill a hole in the fan cover at the part correspond-
ing to the sensor so that the distance between the
sensor and magnet can be made 1 to 2mm.

1919
1919
19
ASSEMBLY & ADJUSTMENT
3Tighten the sensor stay together with the engine
mounting flange. (Temporary assembly)
4Select the mounting method so that the sensor
does not touch the frame, or other parts of the he-
licopter. Temporarily mount the sensor and select
the magnet mounting position.
-Install the sensor to the sensor stay using the accessory screws and wash-
ers.
-Tighten the sensor stay together with the engine using the engine mount
screw.
Cement the magnet to the cooling fan
so that the magnet is level with this side
of the cooling fan.
Magnet
Magnet mounting
(Cooling fan modification)
1Drill a hole in the fan at the magnet mounting posi-
tion.
Make the hole about 4.1mm in diameter and 1.5 to 1.7mm deep.
2Embed the magnet in this hole in the direction in
which an output is obtained.
Use epoxy adhesive that cures in 30 minutes or longer.
Do not use epoxies that contain metal such as JB Weld.
If the cooling fan is unbalanced and vibrates, etc., balance it by mounting
the spare magnet to the opposite side of the cooling fan in the opposite
polarity (so that it does not output a signal).

2020
2020
20
ASSEMBLY & ADJUSTMENT
Sensor adjustment
1Call the "sensor percentage"
screen.
2Adjust the sensor position to ob-
tain a sensor output of at least
60%.
1-2mm
Magnet
Sensor
2.2
mm
3.7mm 3.7mm
Center of sensor
is offset.
Sensor
case
Align the sensor center position and
the center of the magnet shown in the
figure at the left.
3Complete assembly of the sensor by securely
tightening the screws that were temporarily tight-
ened.
4Recheck the sensor output.

2121
2121
21
ASSEMBLY & ADJUSTMENT
GV-1 connections
Magnetic sensor
Throttle servo
Control amp Mixture servo
Connected only when
fuel mixture function
used.
Throttle
channel Speed setting channel
Connected when speed set from
transmitter
Governor ON/OFF / Mixture trim channel
Connected when the governor is turned on and off
from transmitter and when mixture trim function is
used, or when mixture curve data sent from transmit-
ter to governor
Receiver

2222
2222
22
ASSEMBLY & ADJUSTMENT
Fuselage setting precautions
Throttle servo linkage precautions
To effectively use the governor, observe the following precautions when con-
necting the servo linkage.
-Make the servo operating range as wide as possible.
Make the throw of the transmitter ATV function, AFR function, and func-
tions as close as possible to 100%. The governor will not operate at throws
lower than 50%.
-Do not use the throttle curve. Operate the throttle linearly.
-Fly with the governor turned OFF and adjust the needle so that the
engine smoothly reacts to movement of the transmitter stick.
If there is a point at which the reaction of the engine is considerably differ-
ent due to a too rich or too lean mixture, the governor may not operate to
its maximum potential..
Use of a tuned silencer
The use of a tuned pipe type silencer may cause the engine throttle
response to be substantially different from that with a normal muffler.
Adjust the needle (and pipe length) so that engine speed changes are
proportional to the throttle opening. If the engine speed does not
change linearly, the governor will not perform satisfactorily with a muf-
fler or a pipe that does not allow the carburetion to be linear.
Fuselage vibration countermeasures
If the helicopter frame is weak, or the engine mount is deformed or not
installed properly, the vibrations applied to the engine will increase.
Engine vibrations will lead to unstable speed and prevent the governor
from maximum performance. Therefore, make sure that the engine is
vibration free and that the carburetor is of good liner design because
the governor cannot correct engine problems.