Fly-Sky Configuration
and Helicopter Setup Manual

Checking for Servo Direction

When the throttle stick is moved up, all three cyclic servo horns are also supposed to move UP. As you test each servo in the following procedure, check the direction of the servo using the left stick. If a servo is not moving in the correct direction, visit the REVERSE button in the program and check or un-check that channel, and test again.

Now use the radio right stick to slowly move full left and full right. Make sure the servo horn will not make contact with any component on the model. If it does, consider changing the horn to a smaller size. As a last resort when there is no possible way of preventing contact with another part, you can use the ENDPOINT adjustment to limit the travel of the horn. As stated already, this is not the recommended approach. You need the proper servo horn.

Recenter the right stick and verify the mechanical sub trim sliders for the right stick are centered.

With the servo horn for the Aileron servo position as close to 90 degrees to the linkage as possible, go to the SUBTRIM setting for channel 1 of the T6Config application and adjust the value until your servo horn is perfectly 90 degrees to the linkage. Since this is the reference point for the remainder of the setup, it is critical to be correct.

Perform the same servo horn checking steps and 90 degree adjustments with the remaining cyclic servos. Remember to check for interference and without the linkage attached.

At this point, all the cyclic servo horns are exactly 90 degrees to the rod linkages. You have adjusted the SUBTRIM settings for each to accomplish this.

Unplug the model, and save the transmitter settings to a file as setup_step1 (see instruction on page 4 to save the configuration file). Then power off the radio if you would like to save the batteries.

Measure the Aileron Linkage to verify it is the correct length. The TREX 450se V2 Manual calls out for this linkage to be approximately 45mm (1.771609095 inches, or roughly 1 ¾ in.) from the center of the ball link to center of the opposite ball link. The intent of this length is to place the swashplate exactly center between its top and bottom travel limits. Before attaching the linkage between the servo horns and the swashplate, you should find the center of travel the swashplate can travel up and down the main shaft. You want to adjust the Aileron linkage length so that with the Aileron Servo horn at 90 degrees, the swashplate is at that center of travel location on the main shaft, and is level. It doesn't have to be exact, but the closer you get to perfect the better off you will be later on when you want to experiment with maximum blade pitch angles.

Connect the Linkage rods to the servo horns. All ball links are made with one side having a slightly larger opening (hole) than the other side. Link manufactures mark one side of the plastic link to indicate which a specific side. That side marking may be for the smaller or larger hole. Align uses a mark to indicate the small hole side, where the EXE links use a bevel or a circle around the larger opening. The link will go on one way with a little effort, whereas the other side is very difficult if not impossible. The link should make a snapping sound as it is fit over the ball. The ball should not have any play, but should also not be tight. It should move freely on the ball. If the fit is too tight, use a ball link sizing tool to correct the sizing issue.

Make sure you use the same hole on the cyclic servo horns or better described; the horn linkage connections are exactly the same distance from the center of the servo hub gear. Make sure the linkages are straight up and down. Look from the side and the front, rear (all angles) and verify they are as straight up and down as possible. Do not tighten the servo horns in place yet.

Note: If you are using the common Teflon/plastic servo horns, you make have to use a small 1/16th in. drill bit to open the hole, and then thread the horn screw through the hole threading as you go. I have never seen a screw back out of one of these horns, but it is possible. Check them as a part of your pre-flight inspection. Some old school modelers get longer screws, and place a Teflon nut on the other side. You can also purchase threaded balls.

At this point the cyclic servos are connected to the swash plate, the servo horns are at 90 degrees to the linkage rods, the linkage rods are parallel to the main shaft. And the swash plate is half way between its top an bottom travel along the main shaft. The servo horns travel in the correct direction.

   Prev    Next - Leveling the Swashplate

Skip Navigation Links.