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 Align GP gyro is now certainly one of the best, but lucky for us average Joe fliers on a budget, far from the most expensive.
If you are just new to the hobby and getting your first single rotor collective pitch machine, this is a gyro that you will appreciate for many years as it will grow with you. Yes it is certainly capable of the most demanding 3D performance, but as I said, the holding ability, zero drift, easy programming, and versatility is something every heli pilot no matter what your skill level will appreciate flight after flight.
Of course if you are one of the gifted few who have 3D reflexes and nerves of steel, the Align GP gyro will keep up to what ever you want to throw at it. You Might Like These :. My RC Helicopter eBooks are here to help you with those exact problems. Click Here For More Information. I looked high and low for an RC switch that had multiple switched outputs controlled by a single proportional RC channel. I couldn't find bugger all! Are my sear…. I've been getting lots of RC Helicopter stabilization questions lately.
Basic questions such as what is self level mode vs. RC Helicopter Fun. Align GP Gyro. Align DS Tail Servo. DS Metal Gear Set. Enjoy this page? Please pay it forward. Here's how Would you prefer to share this page with others by linking to it? Click on the HTML link code below.
Copy and paste it, adding a note of your own, into your blog, a Web page, forums, a blog comment, your Facebook account, or anywhere that someone would find this page valuable. Go to Flybarless System "Direct mode bypassing gyro, for mechanical travel and neutral point setup" to adjust the level of the swashplate and then re-complete the setup. Should there be changes such as 3GX software update, pitch reconfiguration, or subtrim adjustments, the setup process must be repeated for the flybarless system.
If incorrect movements or servo has no movement, please check servo connection to 3GX as well as radio control system. Version 2. Se "Trottle Calibration" at the end. In this mode the 3GX unit works just like a Rx and output the servo signal from the Tx. Pay extra attention to these setup steps. Incorrect neutral points will affect flight stability, and even lead to loss of control. Press and hold the SET button while powering up the receiver. REV begin to flash in sequence.
Release the button before the flash sequence complete, the DIR green LED will light up indicating the 3GX has been bypassed for mechanical neutral and travel range setup. Adjust the servo neutral point and main blade pitch. Adjust the maximum collective pitch using the transmitter's swashplate mixing function pitch swash AFR.
Should any changes made to the endpoints or subtrims on the transmitter in the future, the 3GX flybarless system initial setup must be performed again. The recommended collective pitch range for various T-Rex helicopters is degress depending on preferenses. Set the right aileron and front elevator to 8 degrees. Only right aileron and front elevator measurement is needed.
Aileron and elevator rates can be adjusted in 3GX panel or cyclic pitch rate adjustment under flight mode settings. For the rest of the setup: The throttle stick position where main pitch is 0 degree must be maintained. While keeping swashplate level and main pitch at zero degrees, press the SET button to register the neutral point and enter E.
LIM setup mode. The E. With all channels stationary, move the transmitter elevator stick forward, and then back to center position. This completes the swashplate mixing type recognization process. The control unit will determine the CCPM mixing ratio or traditional mechanical mixing maximum elevator endpoints.
Press the SET button to enter E. REV setup mode. LIM turns off. This setup mode sets the elevator gyro direction. Tilt the helicopter forward and check if swashplate is tilting correctly toward the back.
Press the SET button to enter A.
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