Twister Medevac 2.4 Setup guide

This high performance model must be assembled according to the
instructions. May cause serious injury to persons or property if not
used responsibly or if operated without due caution.
Unsuitable for children under 14 years old.
Twister medevac 2.4
Ready to fly 4 channel R/c helicopteR
Assembly & Flight Training guide
SpecificationS
Main rotor diameter.............................................................................. 340mm
Fuselage length ..................................................................................... 365mm
R/C transmitter.....................................................Planet 5 2.4GHz Advanced
Cyclic steering ...............................................hi-torque EnerG micro servos
On-board electronic control..................Twister 3-in-1 unit & R6M 2.4GHz
On-board power ...................7.4V 800mAh Li-polymer (with balance lead)
Model weight (no battery) ...........................................................179g (6.3oz)
Flying weight .................................................................................. 222g (7.8oz)
Flight time per charge ..........................................10 minutes (approximate)
Main drive .................................twin motors + ballraced steel main shafts
Primary electronic stabilisation..................on-board piezo yaw rate gyro
Kit contentS
Twister Medevac helicopter ..........................................................................1
Planet 5 Advanced 2.4GHz transmitter .........................................................1
Planet R6M 2.4GHz receiver...........................................................................1
Twister “3 in1” on-board electronics unit ....................................................1
EnErG micro servos .........................................................................................2
Twister 7.4V lithium polymer battery pack ...................................................1
Twister Lithium polymer 12V DC Balancer Charger ...................................1
Twister 240V mains power supply .................................................................1
Twister Medevac instruction manual ...........................................................1
Twister Medevac DVD ....................................................................................1
FREE main blades (upper & lower)....................................................... 2 sets
Flight Simulator USB cable set (connects transmitter to a PC) ...............1
AA transmitter batteries .................................................................................4
V8.09

Vital Safety info
Please read all instructions carefully before using this
model. If any information in this manual is unclear,
please contact your supplier for help.
Please note especially the potential dangers associated
with the rotating parts in this model:
DANGER—Wear protective eyewear when using model
helicopters!
DANGER—Do not wear loose clothing or ties!
DANGER—Keep well clear of rotating blades!
DANGER—Never fly near children or animals!
about the flyinG aRea
ReQuiRed
The Twister Medevac is designed primarily for indoor
use—or outdoors in flat calm conditions. A hard, flat
surface clear of all obstacles with an area of around 400
square feet is the minimum recommended requirement.
However, you should fly only where it is safe to do so.
about tRaininG,
cRaSheS & SpaRe paRtS
The Twister Medevac has been designed to be strong
and very easy to repair, however, the helicopter is not
invulnerable and most people will tip their helicopter
over or break parts during their flying career. This is
quite normal. All parts are available as spares from
your supplier. Study the exploded view of the helicopter
carefully to understand the relationship between parts
and how to replace them if necessary. Crash damage is
not covered by warranty.
GuaRantee/waRRanty
J. Perkins Distribution Ltd and Model Engines (Aust.) Pty. Ltd.
guarantee this product to be free of manufacturing or assembly
defects for a period of one year from time of purchase. This does
not affect your statutory rights. This warranty is not valid for any
damage or subsequent damage arising as a result of a crash,
misuse, modification or for damage or consequential damage
arising as a result of failure to observe the procedures outlined
in this manual. Operation of this model is carried out entirely
at the risk of the operator. Please note that, whilst every effort
is made to ensure the accuracy of instructions and material
included with this product, mistakes can occur and neither J.
Perkins Distribution Ltd/Model Engines (Aust.) Pty. Ltd. nor it’s
distributors will be held liable for any loss or damage arising
from the use of this model or for any loss or damage arising from
omissions or inaccuraccies in the associated instructions or
materials included with this product.
We reserve the right to modify the design of this product,
contents and manuals without prior notification.
© 2007 J Perkins Distribution Ltd, Lenham, Kent, UK ME17 2DL.
www.jperkinsdistribution.co.uk
Model Engines (Aust.) Pty. Ltd., Noble Park, Victoria 3174,
Australia. www.modelengines.com.au. All rights reserved. E&OE.
table of contentS
Guarantee/warranty ........................................ 2
Introduction ...................................................... 3
New to R/C helicopters? ................................ 3
General safety concerning helicopters ...... 4
Welcome ........................................................... 4
A. Kit contents .......................................... 4
B. Transmitter part names ...................... 5
C. Reversing switches ............................. 5
D. Transmitter mode conversion ........... 5
Flight preparation ............................................ 6
A. Fitting the flybar ................................... 6
B. Lithium polymer flight battery ............ 7
C. Charging the flight battery ................. 7
D. Fitting the flight battery ...................... 8
E. Linkage checks .................................... 8
Transmitter layout throttle left (mode 2) ...... 9
A. Stick and trim control summary ........ 9
Transmitter layout throttle right (mode 1) ... 10
A. Stick and trim control summary ........ 10
Power checks and connecting up ............... 11
A. Connecting the Li-po battery ............. 11
B. Swashplate level check(Mode 2) ..... 12
C. Swashplate roll check(Mode 2 ) ....... 12
D. Swashplate elevator check(Mode 2) 13
E. Throttle check(Mode 2 transmitter) .. 13
F. Yaw check .............................................. 13
G. Range check ........................................ 14
Flight controls mode 2 .................................... 14
A. flight controls layout ........................... 14
B. Right stick unit functions .................... 15
C. Left stick unit functions ...................... 15
Flight controls mode 1 .................................... 16
A. flight controls layout ........................... 16
B. Right stick unit functions .................... 17
C. Left stick unit functions ...................... 18
Fine tuning of yaw control ............................. 19
3 in 1 unit adjustors .................................. 19
Damage prevention features ......................... 19
LBW (Low Battery Warning) beacon .... 19
MOPS ......................................................... 19
How does a helicopter fly? ............................ 20
Flight training guide ........................................ 21
The flying area .......................................... 21
Positioning your Twister Medevac ....... 21
Increase throttle gently ........................... 21
Walking the helicopter ............................ 21
Taking the first 'hop' ................................ 22
Hovering and manoeuvres ..................... 22
Beyond the hover ..................................... 22
Troubleshooting ............................................... 23
Lithium polymer battery safety...................... 23
Parts listing....................................................... 24
Exploded view.................................................. 26
USB PC flight simulator cable ....................... 27
Option Parts ...................................................... 27
Binding the TX to the RX................................. 30

intRoduction
Thank you for buying one of the most complete, most stable, high quality scale RC helicopters
available today.
It almost hovers by itself!
The co-axial rotors and ingenious design of this helicopter make RC helicopter flight accessible and
practical to virtually anyone interested in RC helicopters!
The Twister Medevac demonstrates remarkable hovering stability and will help guide pilots into successful
flight in the shortest possible time.
Test-flown, Flight Guaranteed and Ready to Fly!
The Twister Medevac is ready to fly and is designed for use indoors and outdoors (in calm conditions) in
an adequate and safe space. The helicopter is designed by expert engineers and assembled at the factory.
It is very strong and designed with numerous innovative safety features. The Twister Medevac uses the
highest quality drive, power and control systems.
Above all, this is one of the most fun-packed models we have ever flown and we hope you will enjoy flying
it as much as we have!
State-of-the-art electronics in one package
The '3-in-1' on-board electronics package includes piezo gyro, electronic mixers and speed controllers
PLUS an LED system check, and a motor safe-start facility.
Professional Planet 5 2.4GHz R/C included
The transmitter and receiver have been designed for precision helicopter and aircraft flying and feature
Adanced 2.4GHz control and high quality adjustable height stick units (convertible between Mode II
(throttle left) and Mode I (throttle right)).
The transmitter incorporates full 4-function control via two dual axis control sticks and a 5th function
for lights/retracts, etc, socket for an optional Flight Simulator cable set, reversing switches, moulded
ergonomic rear and side grips, carry handle, neckstrap hang point and a charging socket (for charging
optional rechargeable transmitter batteries).
Spares & Option Parts
All spare and option parts are available for the Twister Medevac and can be purchased through model and
hobby outlets.
new to R/c helicopteRS?
Welcome to the thrilling challenge that is RC model helicopter flying!
If you are new to RC helicopters, please do not expect to be able to open the box and immediately 'fly
around'. RC helicopters are fun to fly but require some training in order to be flown successfully.
Helicopter flight techniques must be learnt
The model is not a toy and requires preparation before, during and after flight. It also requires a
commitment to spend a bit of time learning the procedures required for it's successful operation.
To most people, this is an interesting and exciting challenge, however, we recognise this may not be what
you expected from this product.
Therefore, if this is not what you expected, we advise you not to buy it.
Flight Training Guide and DVD included!
We have included a section on Basic Helicopter Flight Theory as well as a Flight Training Guide AND a
Medevac Flight Training DVD—all written and produced with the aid of experienced RC model helicopter
pilots.
We hope this material will help you succesfully explore real RC helicopter flying.
Please note that we do not guarantee that by following the information included with this product you will
be bound to achieve successful helicopter flight. Neither do we guarantee you will not break anything!!

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Twister Medevac
GeneRal Safety conceRninG helicopteRS
Please be aware that rotating blades can inflict painful and possibly serious injuries to people, animals or
objects should the rotors strike someone or something. We recommend people use protective eyewear
when operating this model.
Radio controlled models themselves can reach high speeds and cover significant distances rapidly if
control is lost. This model is capable of speeds around 20mph (30kph).
The model must therefore be used responsibly and with great care generally.
The model operates on the 2.4GHz radio band using the latest 2.4GHz technology, thereby providing prob-
ably the best interference rejection of any R/C system available today. This technology eliminates pilot
frequency worries as the radio encodes it's own unique frequency data at startup in a manner similar to a
bluetooth device.
Please observe the model flying safety code of the British Model Flying Association which can be found at
the the following address:
http://www.bmfa.org
welcome
A. KIT CONTENTS
 1. Carefully remove the model and other items from the packaging.
 2. Insert the 4AA alkaline batteries supplied into the transmitter battery compartment being careful to
observe battery polarity.
Although the Twister Medevac is strong, all model helicopters require careful handling and a delicate
touch. In particular, take great care with the electrical connections to and from the '3-in-1' control unit and
also the main rotor associated parts.
SAFETY NOTE!
Do not shorten the receiver aerial or modify it in any way.
LBW - Low Battery Warning beacon
Flybar assembly
Main shaft
Main blades upper
DC balancer charger
Li-po battery
Tx batteries
Mains power supply
Spare main blades
Instructional DVD
Transmitter
Flight Sim USB cable set

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B. TRANSMITTER PART NAMES
Transmitter battery compartment is located on the reverse side of the transmitter.
Aerial
Battery status LCD
Control trim
ON/OFF switch
Dual axis control stick
Reversing switch cover
C. REVERSING SWITCHES
Reversing switches are used to reverse the direction of the four flying controls.
They are factory-set and should NOT be switched for flying your Twister Medevac.
They may be useful if you use other models or fly the many models available within R/C flight simulators.
The reversing switches are located on the front panel of the transmitter.
D. TRANSMITTER MODE CONVERSION
The transmitter can be converted from throttle left to throttle right and vice versa (i.e. between mode 1 and
mode 2) by appointed engineers. Please contact your supplier for details.

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fliGht pRepaRation
A. FITTING THE FLYBAR
1 2 3
 1. The flybar is supplied loose. Carefully snap fit the flybar unit into the mouldings at the top of the
main shaft following the sequence outlined above. The moulded 'flybar locating lugs' must snap into
the matching holes in the 'flybar hub'.
Flybar hub
Flybar locating lug in matching hole
 2. The assembled flybar hub unit should look like the above.
 3. Snap the plastic flybar link into position on a ball arm as shown above.
The flybar must be free to rock with no friction or sticking!
It should appear to sit 'loosely' in position—double check before proceeding!

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B. LITHIUM POLYMER FLIGHT BATTERY
Charging lead only
The Lithium polymer (Li-po) flight battery is a high power battery designed to give a flight time of 10 minutes
per charge. It is supplied in a partially charged state.
As well as a red JST polarised lead (for connection later to the 3-in-1 board), the battery is also fitted with a
white 3-pin polarised connector. This is the charge lead. Connect this white plug to the 12V charger.
Always leave the battery in a partially charged state. Never leave it in a discharged state.
The battery should be recharged when the LBW beacon on the tail of the helicopter starts to flash blue, or
if you notice the helicopter is losing power. At this point land and recharge the battery.
Do not be tempted to run the battery past this stage as you will be over-discharging and the battery may be
damaged.
WARNING!
We recommend that you use only the supplied Twister charger with this battery.
WARNING!
Over-discharging will shorten the life of the battery or destroy it. Stop flying immediately the LBW (Low
Battery Warning) beacon starts flashing and recharge the battery.
WARNING!
Do not short circuit—battery may explode. See page 23.
PLEASE READ THE SAFETY PROCEDURES FOR HANDLING LI-POLY BATTERIES AT THE END OF THIS
MANUAL ON PAGE 23 BEFORE PROCEEDING FURTHER.
C. CHARGING THE FLIGHT BATTERY
The charger is designed to automatically charge the Li-Po battery in about 1 hour from a discharged state.
The 12V DC automatic charger is powered by the 240 Volt power supply illustrated above.
Alternatively, you can use a 12 volt sealed lead acid battery to power the DC automatic charger.

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 1. Connect the charger to your power source. The 'POWER' LED will flash red.
 2. Plug the 3-pin connector on your Li-po battery into the socket in the right side of the charger.
The green LED will light and the red LED will glow solid red.
 3. When the battery is fully charged the green LED goes out. Disconnect the battery from the charger.
 4. Disconnect the 12V power source from the charger. Your Li-po battery is ready for use.
D. FITTING THE FLIGHT BATTERY
 1. Slide the charged battery pack into the battery holder but do not connect the power lead yet!
Ensure the battery is slid all the way home and retained with a small piece of velcro fastening (attached to
the battery and lower battery holder).
E. LINKAGE CHECKS
 1. Check that all linkages and connectors are attached and that rotating parts are free to rotate
smoothly.
 2. Check that all linkages move freely with no binding or stiffness. Free off any linkages that show any
sign of tightness or binding.

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tRanSmitteR layout thRottle left (mode 2)
A. STICK AND TRIM CONTROL SUMMARY
Throttle trim Fore and aft cyclic trim
Yaw trim Roll cyclic trim
Throttle/Yaw
stick
Cyclic control
stick
 1. Move the throttle (left stick) and throttle trim of your transmitter to the lowest (low throttle) position
as shown above.
 2. Centre the trim levers of the 3 other transmitter functions.
 3. Switch on the transmitter.

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tRanSmitteR layout thRottle RiGht (mode 1)
A. STICK AND TRIM CONTROL SUMMARY
Throttle/Roll
control
stick
Throttle trimFore and aft cyclic trim
Yaw trim Roll cyclic trim
Fore and
aft/Yaw
stick
 1. Move the throttle (right stick) and throttle trim of your transmitter to the lowest (low throttle)
position as shown above.
 2. Centre the trim levers of the 3 other transmitter functions.
 3. Switch on the transmitter.

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poweR checKS and connectinG up
A. CONNECTING THE LI-PO BATTERY
 1. Plug the battery connector into the matching battery lead emerging from the side of the canopy.
WARNING!
Keep hands, clothing, eyes, animals and children well clear when connecting power to this model or
when flying it!
 2. RECEIVER: After the receiver has completed satisfactory systems checks, the on-board LED will
glow orange continuously.
 3. 3-in-1 UNIT: After the on-board 3-in-1 unit has completed satisfactory systems checks, the on-board
LED will glow green continuously.
WARNING!
Do not move the helicopter during the checking and calibration process.
Do not operate the throttle yet!

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B. SWASHPLATE LEVEL CHECK
(MODE 2 TRANSMITTER)
The next stage requires you check control servo operation. Proceed as follows:
Adjust cyclic trims to level swashplate
(Mode 2 transmitter shown)
 The helicopter swashplate should be horizontal when viewed from the front and from the side of the
helicopter. If it is not, adjust it's position by operating the cyclic trims. See pics above.
The ball joints snapped to the swashplate can be unsnapped and screwed/unscrewed if further adjustment
is needed after the model has flown.
C. SWASHPLATE ROLL CHECK
(MODE 2 TRANSMITTER)
 Roll cyclic - Move the transmitter roll (aileron) stick to the left.
The swashplate will tilt as indicated above.

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D. SWASHPLATE ELEVATOR CHECK
(MODE 2 TRANSMITTER)
 Fore and aft cyclic - Move the fore and aft (elevator) stick forward.
The swashplate will tilt as indicated above.
E. THROTTLE CHECK
(MODE 2 TRANSMITTER)
 Throttle - Slowly push the throttle stick forward by a small amount and check that the main rotors
start to rotate.
Then immediately throttle back.
F. YAW CHECK
 Yaw - Tail control is achieved by altering the relative speed of the main rotors and can only be
checked just before take-off as the helicopter becomes light on its skids.

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G. RANGE CHECK
 It is important to check the transmitter will operate the model satisfactorily at maximum range.
 In order to do this place your model on the ground and walk away from the model whilst operating
the swashplate controls.
Check that the servos in the helicopter operate without interference up to a distance of 50 metres.
 Check the transmitter Battery Status LCD shows that the transmitter batteries have a voltage above
4.4V.
Do not fly if battery voltage is below 4.4V.
Your Twister Medevac is ready for flight, but...
WARNING!
...If you are not an experienced R/C model helicopter pilot you must read the ENTIRE manual before flying.
WARNING!
Do not fly at 50 metres distance or greater. At distances of greater than 50 metres, it will become
impossible to see your Twister Medevac.
We strongly recommend you fly no further away than 15 metres.
WARNING!
After finishing flying, always disconnect the battery from the helicopter FIRST. Then switch off the
transmitter. Do not switch off the transmitter first and disconnect battery second.
WARNING!
You must take care and ensure the flying area is large enough and contains no obstacles (such as
children, animals or furniture), which could be hit while you are flying your Twister Medevac.
fliGht contRolS mode 2
A. FLIGHT CONTROLS LAYOUT
Rotate
nose right
Rotate
nose left
Climb
Descend
Crab
right
Crab
left
Forwards
Backwards
 Each dual axis stick unit of your transmitter controls 2 helicopter functions (complete with trimmers
on each function) giving you control about all 4 axes of flight). See above.

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B. RIGHT STICK UNIT FUNCTIONS
 The right stick operates the 'cyclic' steering controls and moves the helicopter forwards/
backwards and to the left/right in the horizontal plane. See below:
Crab
right
Crab
left
Forwards
Backwards
Crab
right
Crab
left
Forwards
Backwards
C. LEFT STICK UNIT FUNCTIONS
 The left stick operates throttle (main rotor speed) and yaw control.
Throttle is increased to climb the helicopter and reduced to descend:
Climb
Descend
 The model hovers at approximately half power (at the middle stick position):
Hover at
this
position

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 Moving the stick to the left or right will rotate the nose to left or right. This is called 'yaw control'.
See below:
Rotate
nose right
Rotate
nose left
Rotate
nose right
Rotate
nose left
Climb
Descend
fliGht contRolS mode 1
A. FLIGHT CONTROLS LAYOUT
Rotate
nose right
Rotate
nose left
Forwards
Backwards
Crab
right
Crab
left
Climb
Descend
 Each dual axis stick unit of your transmitter controls 2 helicopter functions (complete with trimmers
on each function) giving you control about all 4 axes of flight).

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B. RIGHT STICK UNIT FUNCTIONS
 The right stick operates the throttle (main rotor speed) and the 'cyclic' steering which moves the
helicopter to the left/right in the horizontal plane. See below:
Crab
right
Crab
left
Climb
Descend
Crab
right
Crab
left
 The right stick also operates the throttle (main rotor speed).
Throttle is increased to climb the helicopter and reduced to descend:
Climb
Descend
 The model hovers at approximately half power (at the middle stick position):
Hover at
this
position

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C. LEFT STICK UNIT FUNCTIONS
 The left stick operates both yaw control and the forwards/backwards 'cyclic' steering controls.
 Moving the stick to the left or right will rotate the nose to left or right. This is called 'yaw control'.
See below:
Rotate
nose right
Rotate
nose left
Rotate
nose right
Rotate
nose left
Forwards
Backwards
 Moving the stick forwards or backwards will cause the helicopter to move forwards or backwards.
See below:
Forwards
Backwards

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fine tuninG of yaw contRol
3 IN 1 UNIT ADJUSTORS
The 2 trimmers on the front of the '3-in-1' unit are factory adjusted and usually require no adjustment. The
status LED is next to the trimmers. The trimmers perform these functions:
 Gyro gain. The left trimmer (GAIN) adjusts the amount of gyro tail stabilisation from 0 to 100%. 90%
is usually the best setting.
 Yaw trimmer. The right trimmer adjusts tail trim (centring of the tailboom). NB if you adjust this
trimmer you must restart the helicopter in order to observe an effect on yaw trim.
Adjustment of the yaw trimmer has no effect until the li-po battery is disconnected then reconnected.
WARNING!
If your model tips over or crashes or rotors are physically stalled and prevented from turning, you must
immediately reduce throttle to avoid damage to the speed controllers and other components.
Crash damage is not covered by warranty.
damaGe pReVention featuReS
Unique features built into your Twister Medevac are designed to prevent accidental damage to the power,
drive and electronics systems.
LBW (LOW BATTERY WARNING) BEACON
The LED on the cabin of the helicopter will flash blue when the battery needs charging.
You must land immediately and recharge the battery. If you ignore the LBW beacon you risk damaging your
battery!
WARNING!
Damage caused to the battery is not covered by warranty.
MOPS (MOTOR OVERLOAD PROTECTION SYSTEM)
In the event of a crash or tip-over where the blades become stalled, MOPS cuts power to the drive motors
and electronics in order to prevent damage to these components.
If you crash the helicopter badly causing a blade stall, MOPS will kill the power automatically. You should
return the transmitter throttle stick to the low power position. The system will automatically re-arm some
seconds later.

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how doeS a helicopteR fly?
A helicopter must be controlled about 4 axes simultaneously; yaw, pitch, roll and height. Your transmitter
has 2 dual-axis precision stick units with two controls on each stick.
In a throttle left (mode 2) transmitter
 The left stick controls height (climb or descent) and tail rotor controls yaw (left or right).
 The right stick operates the cyclic steering controls which are used to pitch the helicopter nose
up/nose down and to roll the helicopter left or right.
In a throttle right (mode 1) transmitter
 The right stick controls height (climb or descent) and cyclic aileron control to roll the helicopter left
or right.
 The left stick operates the tail rotor controls yaw (left or right) and cyclic elevators controls which
are used to pitch the helicopter nose up/nose down.
The revolutionary contra-rotating sytem used in the Twister Medevac transforms helicopter flight by
making control so easy that the helicopter almost flys itself!
Transmitter stick movements
Helicopters require relatively small control inputs of relatively small duration. Do not move the sticks to
extreme positions. A delicate touch is required on the sticks. The sticks should be allowed to return to
neutral almost immediately after a control input is made. If you watch an experienced pilot hovering his
helicopter, you will see that his transmitter sticks hardly move. This is the goal you will be working towards
in this guide.
Height control
A helicopters rotating wings - the rotor blades, generate lift, in the same way that a propeller generates
thrust. The lift generated by the main rotor blades increases as rotor speed rises causing the helicopter to
climb. Conversely as the main rotor speed is reduced, the helicopter descends.
This method of helicopter height control is called 'fixed pitch'.
Height is managed using the throttle stick of your transmitter.
Push forward to climb, pull back to descend.
Yaw control
Yaw control is achieved by altering the speed of one main rotor relative to the other which causes a
change in the torque generated by the main rotor and hence a rotation to left or right about the main rotor
shaft.
When a helicopter is in the hover it can be yawed left or right.
Push the rudder stick left to yaw the nose of the helicopter to the left and push to the right to yaw the nose
right.
Your Twister Medevac helicopter is fitted with a micro piezo gyro and electronic mixing system which
automatically helps stabilise the tail making for much easier flight.
Steering control - fore and aft cyclic
When hovering, a brief forward push on the cyclic control stick will tilt the rotor disc forward causing the
helicopter to move off in that direction. Pull the stick back gently to stop it. If you pull the stick back further,
you start flying backwards.
Steering control - roll cyclic
When hovering, a brief right control stick movement will roll the rotor disc to the right and the helicopter
will start moving to the right. By briefly moving the stick to the left any right drift or movement will be
arrested or reduced.
Mastering the hover
Both experienced model and full-size helicopter pilots in the hover will gently 'nudge' the cyclic controls
automatically in order to keep their helicopter in one spot and prevent it from moving away from that spot.
A large part of the initial learning phase in helicopter flight is about mastering the cyclic controls and
learning to hover. Control commands will become 'instinctive' when you have 'mastered' the hover.