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.
I had some problems with the tail not holding on pitchpumps with the Walkera 4G6 Helicopter. I’ve tried adjusting the rudder extent pot on the RX but even at maximum the tail wouldn’t hold. I always had some 20° turn on pitchpumps. I also played around with the gyro sense but that didn’t help either.
UPDATE: I’ve found that the pitchslider on the tail had too much play and caused the bad tail reaction. See my other post and vid on repairing the pitchslider. Still the longer carbon tail blades give a bit more power and a slighly better performance over the plastic ones.
I figured the tail might simply be too weak. So i made some tailblades from 0.6mm flat carbon, the same shape as the original ones, only about 5mm longer. They are 0.27gm before sanding and 0.26gm after sanding the profile and clear/white color (original plastic 0.3gm). The tail holds very well now, much more power. Also the piro rate is much higher now, i could turn the rudder extent way down and also decreased the D/R setting for the rudder channel. Only drawback is the increased risk of the blades hitting the ground – but im planning a new, longer carbon tailfin.
