Rob's Hangar

As posted before, the Walkera RX2609 can be modded to a 2.2gm gyro-less RX for micro planes etc. Now here is the mod to use all 6 channels. The 6th channel is gyro-sense which normally goes directly into the gyro. Ive routed the gyro-sense to the SX servo socket. The SX socket was originally used to output the tail servo signal generated by the gyro. Now it put out the gyro-sense / AUX2 signal directly. Only to pad on the PCB have to be connected for this.

Walkera RX 2609 6 Channel mod

Here is my Walkera 4G6 landing gear. Hybrid design made from parts of the original 4G6 gear and an old HM52#1 gear (see my older post here), held together by shrink tube and ca. The 4G6 gear is super lightweight and unbrakable and the HM52#1 mounting provides a wider spread so the heli has more stability on the ground and during landings. Total weight incl. screws is 2.2gm only, so its weight is even less then the original Walkera 4G6 LG (2.4gm).

Hybrid 4G6 / HM52 landing gear on the 4G6 - sideview

Hybrid 4G6 / HM52 landing gear on the 4G6 - mounting

Hybrid 4G6 / HM52 landing gear on the 4G6

only 2.22gm 4G6 / HM52 landing gear

Now its official. The Walkera 4G6 2609 RX can be separated. One of the boards is the gyro, the other one is RX only (that is the board with all the servo connectors). After seperating the RX board is only 2.25gm (see pic below). As is the thing has 5 channels but it might be possible to use the gyro sens. channel as well, making it fully 6 ch.

The RX will be used in my BLiX-Twin.

Here is a short video with the seperated RX alive:

gyroless RX2609 2.25gm

As the 30mm wide Zippy lipos (450, 600mAh) wont fits into the stock Walkera 4G6 landing gear i have removed the battery holder from and cut the LG in the middle of the front mounting. Drilled a second whole and used a longer screw to mount it.

Now the distance between the struts big enough for 30mm Zippys. Lipo is held by a rubber band. Maybe not the most elegant solution, but less weight than any other landing gear. Stabilty of the LG is still strong.

Walkera 4G6 landing gear modified for Zippy lipos

There have been questions about how to set up the Gaui mixerarms on the Walkera 4G6 heli correctly.

When using the metal bladegrips you will need spacers in order to have the ball links exactly in the center over the flybar.
I took some M1 hexnuts, drilled them to 1.5mm inner diameter and used them as spacers. they are about 0.7mm thick, this is perfect for my setup. What kind of spacer thickness to use depends on how tight your bladegrips are on the feathering shaft, the space between rotorhead and bladegrips. 0.7mm spacers should be perfect for the stock setup. If you use the plastic bladegrips the bosses have to be trimmed down a bit.

The video shows how to check if you have the correct spacers. Notice that the ball links line up almost perfectly in the video. If they are not in line you will get friction and vibrations in the rotorhead.

Image below shows all the detail to look for.

Gaui Mixerarms on the Walkera 4G6 - correct setup

The stock Walkera 4G6 mixer arms have way too much play, also no ball bearing. So i took some aluminum mixer arms from the Gaui EP100 V2 aka Minizoom Pro V2, part 203580 (silver) or part 203640 (black). The original ball links can be removed and the Walkera ball links fit into the threads in the Gaui parts. The Gaui parts work with the plastic Walkera bladegrips, if you use the metal bladegrips some spacers are necessary. The Gaui arms are a bit shorter but that doesnt seem to change the feel.

Result: The heli feels much more precise and most unexpected pitch-jumps are gone. Still have to shorten the plasic on the bladeholders where the screw goes in.
Thanks to Don on RCGroups – i first saw the mod from him.

Here is a video from RCGroups user jaguar_5, showing the difference:

Walkera 4G6 with Gaui EP100 mixer arms

Gaui EP100 mixer arms

Walkera 4G6 mixer arms (left) vs. Gaui EP100 mixer arms (right)

X-Twin Acrobat elevator actuator controlled via an old Walkera servo board from a WK03-02 (4#3B) servo. First step towards the 2.4Ghz brushless X-Twin.

Actuator: 50 Ohm
SMD Pot on the servo board: 5 kOhm (for centering)
Actuator soldered to the servo motor output

Walkera 4#3B and the 2801Pro - Micro Heli Dreamteam

With the 2801Pro (2801 and 2801e should be similar) it is possible to setup the throttle curve, dual rate and expo for the 2406/A/B RX range. This is done by switching stickmode (COMPTB) to 2801, doing the setup, and then switching back to 2401 stickmode. The settings made will stay.

After going back into 2401 stickmode the bind should automaticly come back (if you left the rx connected to the battery). if not, just do a re-bind.

This video show how:

How to get rid of the play in the pitchslider (Walkera part no.: HM-4G6-Z27 “Tail Steering Set”) on the Walkera 4G6.

Using pliers to press the plastic part on the metal part of the slider. CA to keep it in place.

I just opened the 2801Pro from my 4G6 (great little helicopter) because i didn’t like the trottle stick tension. Tension was too strong and i dont like the snapping.

To get rid of the snapping i carefully sanded down the little plasic teeth inside the throttle stick mechanics. A very small amount of grease on the plasic and the metal locking-part makes the throttle stick movement even smoother.

I wanted to be able to adjust the tension screw without opening the Tx casing, so i drilled a 4mm hole into the back of the Tx.

Walkera 2801 Pro throttle stick tension adjustment mod

Another thing to do would be to replace the bushings with bearings like Spektrum on the DX7. Heres a great how-to for the bearing mod on the Spektrum DX7 – should work pretty much the same way on the 2801.