Rob's Hangar

Walkera 4G6 with HK250 tail rotor grips

Just tested the Walkera 4G6 with HK-250 GT tail rotor grips and hub. Very nice!

The HK250 tailshaft is 2mm so i had to use some shrinktube on the 4G6 tailshaft which is only 1.5mm. I removed the hub from the original Walkera tailshaft. With shrinktube, fit is perfect and secured by a grubscrew in the hub.

Walkera 4G6 with HK250 tail rotor grips - top view

The Walkera metal balllinks have been epoxied into the bladegrips. I also made some new 1mm CF tailblades with sanded airfoil. Had to use a little piece of 0.5mm CF as a space as the HK-250 GT tailblades are 1mm.

Walkera 4G6 with HK250 tail rotor grips - side view

Additional weight is 1.2 gm. Result is a perfectly solid tail. Only drawback is that the pitchslider trave is slightly reduced (by about 2mm), resulting i slower piro rates. I might make a custom tailshaft from 1.5mm steel which is slightly longer than the original walkera shaft.

Now i only need the new pitchslider from Hardy and this will be the perfect 4G6 tail.

size comparison

Also with Hardys blade grip mod (inlays) i will do a direct comparison between the modded Walkera plastic bladehoders and the HK-250 GT parts.

Hardy from rclineforum.de has some improvements for the sloppy Walkera 4G6 tail: Brass inlays for the bladeholders that will eliminate most of the play on the tailrotor hub are only the beginning. Then there is the custom aluminum/brass pitchslider (bearings inside) – looks like a major improvement over the stock part. Now thats some german engineering at its best! Hopefully these parts will be available soon, for now we can only catch a glimpse of the prototypes. A link to Hardy’s site can be found below the images.

tail blade holder with and without brass inlays

aluminum pitchslider with inserted bearings

aluminum pitchslider looks solid

You can find Hardys Website here (in german) http://www.byws.de/start.htm. Direct link to his mod (google translated) here.

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.