V120D05 v2 tail wont hold .

[akiraceo]

Hello fellow heli freaks !

Firstly i'd like to say , this is my first post in this forum , though i've been lurking around as a guest for a long time since i got my walkera v120d05 v2 heli last week!

Okay, straight to the point -

I've tried the heli only a few hovers , nothing more than that as I'm no experienced CP flyer. Had experience with FP flying last time though .

I noticed that when i push the throttle higher quickly, the tail wont hold! it rotates counter clockwise and stops there , if i keep pushing, it will eventually rotate a whole rotation.

I suppose i may not be very familiar with the WK-2603 transmitter, I've played with RUDMIX GYRO , v1 and v2 knob , V1 knob now at 80% for HH mode , V2 knob is gyro sensitivity , so i set it at 70% , tried all ranges from 0-100% , with no improvement , but worsens the case ( Rate mode in V1 0-50% , does not hold the tail at all )

Other than that, is there a problem with the gyro? i noticed after some time, it loses tail control , ( Might be low battery i suppose , cause i noticed it does that a min before cut-off )

Help is much appreciated guys ! CP Heli scene is very challenging indeed :clappp

[w4llet]

I have this model too...

For a throttle kick that tail behavior is normal.

Try to increase headspeed, it will help.

If you dont know how to do it, try to hover in stunt mode, you will see tail will hold better.

Cheerz!

[akiraceo]

Hey guys , seems that i got another problem!

Now, at a certain throttle during hover , tail suddenly kicks to the right !

it should be the gyro doing that right? .

From what i can come up with , it seems that the vibration at a certain throttle extent is messing with the gyro .

Im using V120D02 blades, it was working fine before, i checked blade tracking , all good.

When it spins, i can see it bends a little , seems softer than the v120d05 blades?

Also , is there suppose to be a little "Give" on the blade grips that are connected to the main head? it seems that i can actually make it see-saw a little bit. :roll:

again , help is much appreciated! learning every step :YeaBaby:

[vronny]

Hey guys , seems that i got another problem!

Now, at a certain throttle during hover , tail suddenly kicks to the right !

it should be the gyro doing that right? .

From what i can come up with , it seems that the vibration at a certain throttle extent is messing with the gyro .

Im using V120D02 blades, it was working fine before, i checked blade tracking , all good.

When it spins, i can see it bends a little , seems softer than the v120d05 blades?

Also , is there suppose to be a little "Give" on the blade grips that are connected to the main head? it seems that i can actually make it see-saw a little bit. :roll:

again , help is much appreciated! learning every step :YeaBaby:The 4G6/120s size all use the same blades just different colors. The problem with that heli was gear ratio to tail is to low. Did you balance blades an did you crash? If so you could have bend feathering shaft or main shaft. You could have also stripped main gear check to see if main gear is missing teeth. Get more batteries.

[w4llet]

I have this problem a couple of times.

Since its a belt driven, you need the right tension on belt.

I think you had the heli tail hitting the ground. Sometimes, when that happens, the tail boom moves a little bit to the frame and the belt comes a little loose.

Just unscrew a little bit the tail screw and pull the tail a little bit back. After doing this regularly, tail wag is history in my bird.

I hope you can solve your problem.

[akiraceo]

Hello guys,

Thanks for ur swift reply and suggestions ,

I have already replaced the main shaft , checked the blade tracking , turned the feathering shaft to see if its bent , but all is good :roll:

@w4llet ,

I think my tail has enough tension , unless ur using a tool to force it back while screwing it tight?

I've just tested using a ziptie to force the tail back while i screw it in , but doesnt seem to make a difference.

at a certain throttle , it still spins madly counter-clockwise .

I've repositioned the Gyro a little more to the front to avoid it touching the servos minimizing any vibration to it , double stacked double tape under it , repositioned the ESC a little lower than the original position as so the heat wont get to the gyro.

Will try troubleshooting more later on , as i've spent 2 hours this morning trying to rectify the problem on the radio , to no avail :dontknow

Again, Help is much appreciated! :peace

[vronny]

Hello guys,

Thanks for ur swift reply and suggestions ,

I have already replaced the main shaft , checked the blade tracking , turned the feathering shaft to see if its bent , but all is good :roll:

@w4llet ,

I think my tail has enough tension , unless ur using a tool to force it back while screwing it tight?

I've just tested using a ziptie to force the tail back while i screw it in , but doesnt seem to make a difference.

at a certain throttle , it still spins madly counter-clockwise .

I've repositioned the Gyro a little more to the front to avoid it touching the servos minimizing any vibration to it , double stacked double tape under it , repositioned the ESC a little lower than the original position as so the heat wont get to the gyro.

Will try troubleshooting more later on , as i've spent 2 hours this morning trying to rectify the problem on the radio , to no avail :dontknow

Again, Help is much appreciated! :peaceDid you balance the blades & ziptie rx to frame. Tracking & balancing the blades you use a balancer to make sure they are the same weight with tape.

[w4llet]

After binding do you have a red light lit on receiver?

[akiraceo]

Hello ,

Sorry for the Late reply,

honestly, i'm giving up on this heli already.

I've balanced the blades with tracking tape , checked the main shaft again , tied the RX down to the frame with zip ties

Yes, i have a red light after binding .

I think i might have gotten a faulty heli :thumbdown::thumbdown:

[Jskrapper]

I have this problem a couple of times.

Since its a belt driven, you need the right tension on belt.

I think you had the heli tail hitting the ground. Sometimes, when that happens, the tail boom moves a little bit to the frame and the belt comes a little loose.

Just unscrew a little bit the tail screw and pull the tail a little bit back. After doing this regularly, tail wag is history in my bird.

I hope you can solve your problem.

Look at you giving great advice like a pro!

Love to see the knowledge spread. :clap:clap

[w4llet]

Jskrapper,

I am a quick learner and fortunate to have the best teacher.
Thank you for sharing your knowledge unconditionally.

:clappp

[w4llet]

Hello ,

Sorry for the Late reply,

honestly, i'm giving up on this heli already.

I've balanced the blades with tracking tape , checked the main shaft again , tied the RX down to the frame with zip ties

Yes, i have a red light after binding .

I think i might have gotten a faulty heli :thumbdown::thumbdown:


Maybe a faulty tail servo?

I am out of ideas.

I think my tail servo is almost fried. Since last month it starts doing something like parkinson`s disease..... Its working yet, but shakes are getting often every week.

[czynot]

Here is a great fix for all the v120d05 weak tail.
http://www.rcgroups.com/forums/showthread.php?t=1456406&page=2

10.00 fix. My v120D05 feel like a new Heli with solid tail. no drift of any kind. TRY IT!

All you need 4G6 (HM-4G6-Z-18) main gear and CB180 (HM-CB180Z-14) tail gear.

[Mikey2]

Maybe a faulty tail servo?

I am out of ideas.

I think my tail servo is almost fried. Since last month it starts doing something like parkinson`s disease..... Its working yet, but shakes are getting often every week.

Walkera tail servos are notoriously unpredictable and given to exactly the condition you describe. Encountered exactly the servo condition you describe on a 4G6, replaced servo and problem solved. As someone else has already stated however, the D05 has an inherent design flaw that automatically limits its directional authority and tail control to "symptomatic" cures. I debated for 2 months between the D05 and the shaft driven M120D01 cuz I prefer "belts" to torque tubes. It just doesn't sound like Walkera's gonna re-engineer the drive train for the D05 or leave it to the aftermarket to resolve the issue.

[w4llet]

Well, I have a spare tail servo ready to replace it. Despite the shakes i did not notice any strange tail behavior during ff or hovering. Its like a centering problem when heli is not having any tail input and its on the ground.

Have you ever tried to mod another brand tail servo to this heli?

I do not like TT either. I have one here. Just because those gears melt like butter and does too much noise.