Swap Pages. Members Current visitors. Log in Register. What's new. New posts. Log in. For a better experience, please enable JavaScript in your browser before proceeding. Spektrum DX 7 will not work. Thread starter Maddog Start date Mar 2, Maddog New member. Thanks Maddog. Blade Scraper Banned. Maddog said:. Check them out. Try this. Try This Out Setting for Realflight 3. You don't have to do all that. You're probably just in "Heli" mode instead of "Acro" on your radio.
Switch to Acro, do the calibration, and then do channel mapping to set everything properly. How do you switch to ACro mode. On a Spektrum transmitter, bind the transmitter and receiver using the bind plug and set the fail-safe state to low-throttle and throttle-hold switched on.
This will essentially prepare for a soft landing by cutting the power and increase the blade pitch if the transmitter signal is unexpectedly lost. Also re-bind the Rx when the heli is set-up.
When dealing the RC helicopters, always remember to power on the radio first then the receiver and power to the engine, reverse the rutine to disconnect. The helicopter could spin-up unexpectedly if the receiver doesn't have contact with the radio. Low throttle stick and throttle hold is also important before flight.
The head setup should mechanically be as symmetrical and zero-pitched as possible. The radio should have a straight pitch curve in normal mode before starting the adjustments. This is only the mechanical build, the tweaking is mentioned below. Install the servos and mount a suitable servo arm 90 degrees to the swashplate. Connect the rods to the swashplate with the length specified in the manual. Figuring out the correct direction of the swash servos is a two step process.
Move the throttle stick slightly up and watch the servos, all three should move collectively up to raise the swashplate, if one servo goes in the opposite dirrection go into the radio setup and reverse the direction of the affected servo.
Alternatively if the swashplate is moving down while the stick is moving up, go into the swash mix and invert the pitch value, from positive to negative. Do the same for aileron and elevator. That's determined by the lengths of the link-rods connecting to the arms.
Both arms should be identical length for each level. The washout arms should be positioned in the middle of the shaft for maximum and minimum pitch travel when moving throttle stick. If everything seem level, use a digital caliper verify and duplicate the length of related link rods. This will reduce vibrations and tracking issues.
It's called collective because there are 3 servos involved. There are two types of CCPM, mechanical bell crank and electronic mixing. The latter one is used on most helicopters today but requires precision servo setup and radio configuration. The radio is setup to mix, or compute the values, for the 3 servos in order to move the swashplate in the right direction and plane.
Be it up-down, left-right, or forward-backward. It's imperative that the head is precisely setup mechanically to get a good CCPM configuration. First check if the servos are going in the right direction, if one servo goes in the opposite direction, reverse that channel.
Alternatively, if you move aileron left, but the swashplate moves right, go into the swash mixing, change the positive aileron percentage to negative value to reverse the movement. Swash mixing controls the pitch of the blades. A pitch gauge is mounted on the main blades and is used to measure a predetermined pitch against the level flybar. The higher the value, the steeper the pitch. A regular setup usually use collective pitch The maximum and minimum pitch should never bind and lock the servos.
Aileron and elevator pitch is normally 6. After the process below is done, everything should be level and swash mixing complete, the movement of the collective pitch to maximum or minimum should keep the swashplate level.
But it's not always true if the servos move in different speed or travel range. This issue is called CCPM interaction and can be handled by watching the flybar at aileron and elevator position side, front while moving the pitch up and down. Use travel adjust not sub-trim to counter the reaction and dial in the appropriate servo travel to keep the swashplate level for the full top to bottom range.
The idea behind pitch and throttle on one stick is to keep a constant headspeed. If the pitch is steep more engine power is required to keep the headspeed revolutions up.
This is accomplished by setting up curves on the radio for controlling the pitch and throttle individually. There is usually a 5-point coordinate system to set the percentage at a specific stick position.
A last mode is Throttle Hold for auto-rotation on engine failure, a second switch is normally used for this. Useful when battery is empty or when a crash is inevitable less damage. Normal Mode is used during spin-up and hovering. These parameters are mainly set-up on the radio by altering the engine throttle and rotor pitch curve. With Stunt Mode turned on the hovering mode is turned into a flexible mode where the helicopter can perform acrobatics and be flown a up-side-down.
Look at the picture below to understand the difference between Normal and Stunt. While setting up the curves, there is an option to enable Exponential. More stick movement is required to get to the same servo movement. But it's not recommended to keep expo. The throttle curve dips on the middle because the pitch is close to 0 degrees, thus requiring less power.
Higher pitch requires more engine power to keep the headspeed constant. Dual Rates, as the name suggests, can be used to setup two different servo ranges to limit the maximum throw, or travel. This lowers the sensitivity and can be used to lower the sensitivity of the helicopter in flight but requires more stick movement. Making dual rates useful for new users and hovering. The later kits and SE model has the 3rd revision of the tail blade holders and incorporate dual "chinese weights" on each side of the holders.
These weights and the centrifugal force helps to eliminate the blade holders from flickering back and forth. GP settings move rudder stick to left for Green and right for Red :. The gyro is a device connected between the receiver and the rudder servo, it will stabilize the tail by counter the torque reaction of the main rotor.
There are two types, heading hold mode continuously tries to hold the tip of the helicopter at a constant angle, while the other mode, rate mode, dampens any external push to the tail. The former is preferred for normal hovering and acrobatics, while the second is mostly used for scale models. Don't move the heli or touch the transmitter sticks when powering on the receiver and gyro.
A green light will indicate heading hold mode and red rate mode GP The gyro is connected to the receiver by two plugs. One for the rudder input and one for gain. Gyro gain is used to control how much the gyro tries to control the tail or hold authority and is measured in percentages.
Rudder stick input will notify the gyro and the gyro will then try as hard as it can to rotate, or move the tail, in the direction of the input. Dialing in the gyro gain is essential to get a stable tail. If the tail wags back and forth the gain amount has to be reduced and if the heading isn't holding pirouetting the gain has to be increased. Note that the gain wire is electronically connected like any regular servo and if the channel is reversed so will the rates.
On most radios, the gyro mode can be setup at specific rates for different flight modes. There are two ways to set gyro gain, either via the gyro menu or set the channel end points, a.
The former is preferred. It's important to not use any sub-trim on the rudder and adjust the link rod instead, this will leave the gyro in command. Although the ESC is pre-programmed from factory, do re-program it to make sure the settings are at the supposed values. It eliminates any issues that might be introduced during manufacturing or storage. Higher BEC voltage will give the servos more torque and reaction time. For specific servos requiring 5.
Futaba , use a servo step down voltage regulator. What makes a good battery pack good is the ability to hold voltage under load. When you start to fly aggresively, some battery pack will drop more voltage than other, resulting in bogging of head speed.
A good battery pack will have minimal voltage drop during heavy load, resulting in more punch and consistent speed. There are two main types of battery connectors, Deans and JST.
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