Page 4

Questions and Answers

All helicopters will be checked carefully before shipping, however during transportation always something might get loose or shifts. Always check carefully your helicopter before using. In case of doubt always check with an expert.
It is assumed that you always prepare well before starting to fly helicopters and practise with a simulator.

In this section you will mainly find answers on issues you might encounter with your Dragonfly HM004 (DF04) RC Micro Helicopter.
With this information we would like to support you with your new RC Micro Helicopter hobby, to prevent problems and to answer the most common questions you might have.

When things are not clear, are missing or seem incorrect, please let us know, so we can adjust or extend these support pages so other RC Helicopter flyers can also benefit from it.

What is the battery charging time ?

The with the RC Helicopter shipped batteries (8.4v 650mAh) are fully charged within 2 hours with the included charger.
For the standard batteries it is recommended to use a timing device so power is cut off automatically after the two hours. Longer charging times may damage your batteries.
The 7.4v 1200mAh LIPO batteries are fully charged within an hour with a special Li-Ion charger. The charger provided in this shop for LIPO batteries automatically detects when batteries are full, indicated by a LED.
Frequently check your batteries while charging, when batteries get hot stop charging immediately.
Never charge or use damaged, broken or swollen batteries.

How to replace the paddle bar

The paddlebar is connected with two screws in the rotating frame. First dismount the screws in the rotating frame, so the paddlebar can be removed/replaced.

How to replace the rotorhead core

First remove the main rotor blades by pushing gentle but firm between the bearings and rotorhead, so it will come loose. Remove the paddles using a precision screwdriver, loosen the balllinks, the paddlebar and rotating frame. Now push the metal pushpin through the rotorhead core (use for example the side of you screwdriver, so you can push better and more stable). Try to limit pulling on the pushpin to avoid bending or breaking down some other parts. Next try to push the pushpin in even more using another smal pin, so you can gently pull it out on the other side. When the pin is being removed the rotorhead can be replaced and in reverse order attached again.

How to replace the tail boom

The replace the tail boom, you first have to solder loose the tail motor. Next turn loose the tailholder with a small philips screwdriver and loosen the screw at the main frame where the tail boom is attached. Now the tail boom can be removed and a new one can be placed in reverse order.

How to put the rotorhead back into position

As a safety measure, saving money in your helicopter hobby, the rotorhead can sometimes at crashes pop out. Ofter only one side the bearings are out of the rotorhead. Generally speaking this initially looks worse than it really is.
Placing it back into position can be done best by using a screwdriver (not too small one). Place the rotorhead on top of the bearings of the rotorhead core. Put your finger on the rotorhead to give some pressure. Next push with the flatside of your screwdriver against the bearing so it pops in position again. If the other side was also popped out, repeat this step also for the other side.

Your RC Helicopter does not respond at all

- Battery of your helicopter well connected ?
- Battery of your rc helicopter charged ?
- Transmitter batteries inserted well ?
- Trasnmitter batteries charged ?
- Have you placed all 8 batteries in your transmitter ?
- Have you released the safety mechanism of your helicopter ?
- Are all connectors attached ?

Main Rotor and or Servo's move automatically (hickups)

- avoid as much as possible any interference / reflections of other electrical devices.
Think of, tv, computers, cellphones, wireless equipment.
- Check whether the crystals of transmitter and receiver are still connected well.
When this is not the case, this might lead to serious interference and the main rotor can spin uncontrolled.
- Check whether the antenna is still in one piece (never shorten the length of the antenna) and wrapped around the landing gear as delivered out of the box.
- Check whether all connections are still ok and that the - pole of the motors are well connected to the motor housing. If not solder it again, as this will help getting rid of the energie fields created by the rotating parts.

Helicopter main rotor is spinning automatically

- Put the trim (vertical) of the throttle more down.
- Check whether the crystal in the receiverbox is still mounted correctly, fixed tight.

My RC Helicopter tail rotor spins too fast/slow

- Change the horizontal trim of the throttle more to the left/right.
- Placing the trim more to the right will make it spin faster.

My RC Micro Helicopter leans to a side

- Note that a helicopter is always leaning a bit, it will never fly completely horizontal ! - Have you balanced the helicopter correctly (move the battery in the correct position) ?
- Is the training set well fixated ?

My Helicopter is moving into a certain direction

- Is the weight balanced well (using the battery) ?
- Servo arms angle 90 degrees ? - Swashplate trimmed in horizontal position ?
- Servo links move smooth with swashplate ?
- Are Paddles in parrallel with rotating frame ?
- Trims for servo's not well set ?
- Paddlebar not balanced well ?

Helicopter is shaking / wobbling

- Main rotor blades correctly balanced ?
- Main rotor blade mounted too tight ?
- Main rotor blades too loose ?
- Paddlebar broken/in rotorhead core split ?
- Paddlebar not balanced ?
- Paddlebar not mounted well in rotating frame ?
- Paddlebar length on both sides of rotorhead core of equal length ?
- Paddles in parallel with the rotating frame ?
- Main gear not straigth anymore ?
- Trainingscross / training set not proper mounted ?
- Tailboom still in one piece / not broken ?

Tail motor does not work

- Is the horizontal Trim (of the throttle) not enough to the right ?
- Tail motor connected well ?
- Tail motor contacts soldered well / good connections ?
- No short-circuits on your tail motor ?
- Can the tail rotor spin easy ?
- Tail motor broken / worn out ?
- 3in1 box broken ?

The tail is turning away, does not steer well

- Turns your tail rotor smooth ?
- Tail rotor rubber sleeve to tight ?
- Tail rotor broken ?
- Tail rotor not connected well / inserted ?
- Tail motor mounted straight ?
- Tail motor not too tight to pinion ?
- Pinion still fixed on tail motor ?
- Bearings not dirty ?
- Tail boom not broken ?
- Tail holder mounted in 90 degree angle with tail / helicopter ?
- Tail motor worn out ?
- Tail motor broken due to crash ?
- Antenna placed correctly ?
- No extranal interference (tv/computer) ?

Helikopter tail hickups
- see also The tail is turning away, does not steer well
- Tail rotor balanced well ?


Batteries In the Walkera Dragonly Transmitters fit 8AA (1.5v) batteries. It is allowed to use re-chargeable batteries, use batteries with a high mAh for long usage.

Safety Mecahnism
The Walkera Dragonfly HM004 (DF04) has a safety mechanism on board that prevents sudden unexpected take offs at the time of powering up your helicopter (by connecting the battery of the heliopter). Watch out, it is a good practice to turn on the transmitter first and next connect the battery of the helicopter. Turning of always in reverse order, so first disconnect the battery then it is safe to turn off your transmitter. Releasing the safety mechanism of the helicopter can be accomplished by pulling the throttle of your transmitter to the lowest position first. Now when moving up the motors will get power.

DIP switches
At the back side of the transmitter there are dip-switches to control the behavior of your controls. Factory setting should be ok. The default settings for the Dragonfly HM004 transmitter are: DIP switch 1, 3 and 4 are default on, all other are in off position.

What's the purpose of the switches on thr trasmitter
The button and both switches have no particular purpose on the transmitter of the Walkera Dragonfly HM004 (DF04).

Power Indicator
The Power Indicator on the RC transmitter indicated the power left of the transmitter batteries.
Green: Transmitter has enough power.
Orange: Transmitter power is getting low. Stop flying and replace or recharge the batteries.
Red: Transmitter power too low. Stop flying and get the RC helicopter safe on the ground. Replace transmitter batteries or recharge.

PC Simulator Cable
The PC Simulator cable can be connected at the back side of the RC transmitter. Using the PC Simulator cable (and PPJOY and FMS) flying RC helicopters can be practiced from behind your PC using your transmitter. Note that really flying a RC Micro Helicopter is a different thing.

Changing the length of your transmitter sticks for better control
The height of the transmitter sticks can be altered to your prefered setting. Increasing the length of the sticks allows you to relatively move more with less steering effect. This is very handy when starting this new hobby. Put the with the helicopter provided tool (a hexagon screw driver) in the top of the stick and hold it. Now turn the stick counter clock wise to increase the length of the stick. At the required height ive with the screw driver a final twist to the right to fixate it.

The trims are the controls below and next to the sticks. Finetuning of you helicopter movements is controlled with that. For example on a mode 2 transmitter, at the left stick the horizontal control changes the power sent to the tail motor. Trim more to the right will give more power and makes the helicopter tail spin to the left.

Transmitter Frequency
The Frequency of the transmitter (and helicopter) can be read from the back of the helicopter and on the label attached to the crystal mounted in the receiver box. From this shop standard 35Mhz is being delivered.

In America 72Mhz is standard.


Collective Pitch
A Collective Pitch RC Helicopter has symetrical non curved main rotor blades. The pitch is created using an additional servo that controls the turning of the blades creating more or less pitch. By creating more pitch the helicopter will gain attitude faster.

Fixed Pitch
A Fixed Pitch RC Helicopter has fixed main rotor blades. These main rotor blades are curved to create the pitch that is needed to lift the helicopter. The difference with collective pitch is that gaining height is controlled with the motor speed only.
More power to the main motor will make the main rotor blades spin faster and as such creating more lift.

The gyro makes sure that the helicopter flies stable and measures the differences in movement of the tail. The changes measured will be sent to the mixer (in the receiver box (3in1)) and combined with the other steering signals coming from your transmitter to keep the tail in the correct position. The Gyro in fact prevents the helicopter from uncontrolled spinning.

Mode 1
Mode 1 indicates the type of transmitter used. A mode 1 transmitter indicates that the throttle is on the transmitter right stick.

Mode 2
Mode 2 indicates the type of transmitter used. A mode 2 transmitter indicates that the throttle is on the transmitter left stick.
This modus is offered in this shop as it is most commonly used (is very similar to game controls where the direction movements are on the righthand side).

Copyright © 2022 RC4me.