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View Full Version : 6HV Maiden, weird twitch?


glowster21
06-25-2011, 08:32 PM
Hey all, I finally maidened my 6HV today and half way through the flight I started to get a really weird head twitch. Was only doing basic hovers and circuits, I have to admit I was a bit scared as I've never flown anything this big, and I'd get this occasional twitch. I checked it and everything is nice and tight, anyone experience this? I set it up initially with an Align GP750 before my Beastx goes in, I'm also using Savox 1258's on the cyclic and an Align 650 on the tail. My bls251 for some reason wouldn't power up so I stuck with the 650. Anyone?

360Wings
06-25-2011, 08:37 PM
The BLS251 use 760 frame rate so it wont work with your gyro.. You will need a Quark, ds760, Solid G, GY601 or similar gyro that supports the 760 frame rate... The 650 is a 1520 rate frame which is what the align gyro uses..

The BeastX supports 760 frame rate servos so you can use it.

Jason O'Connell
06-25-2011, 09:37 PM
Have you grounded the boom?

John Cook
06-25-2011, 10:44 PM
align gyros can use 760us tail servos, but you will need to reference the instructions on how to set it. I know with the Outrage tail servos people sent them back saying they were bad, when they weren't. There was also some problems with the Align instructions. Search on how to set the 760 frame rate and the BLS251 will work fine. That said, the BLS251 feels soft to me, I prefer the feel of the Align 650 over the 251. The MKS BLS tails I'm liking as much as my Outrage tail servos(who are made by MKS).

glowster21
06-26-2011, 06:53 AM
Guys, the tail is rock solid with the 650, that's not the twitch. It's in the head itself and happened about 3 minutes into my maiden. I brought it down, checked everything and went back up. It happened 2 more times over the final 2 minutes. They were brief head twitches. No I haven't grounded the boom, think that may be the issue? Again, tail is perfect my concern is from an intermittent head "twitch". Back to the servo though, shouldn't it have worked plugging directly to the receiver? Got nothing when I tried to center it.
Thanks!

bostonkiter
06-26-2011, 07:18 AM
If I've learned anything about this hobby, it's GROUND YOUR TAIL BOOM!

Also, get some pure silicone spray for the belt. Spray it every 12 flights or so through the tail box.

360Wings
06-26-2011, 07:46 AM
No I haven't grounded the boom, think that may be the issue? Again, tail is perfect my concern is from an intermittent head "twitch". Back to the servo though, shouldn't it have worked plugging directly to the receiver? Got nothing when I tried to center it.
Thanks!

It will need to be plugged into a gyro and the gyro set for 760 frame rate, if not the servo will appear to be 'dead'.

As for the twitch, I agree with the others, it could very well be cause from build up of static from the boom/belt.. Doesnt take long to ground it, and will more than likely fix the twitch..

Dflyer
06-26-2011, 07:55 AM
Hi glowster21,

are you flying the stock Hobbywing ESC ?? If so and you're flying it in governor mode this could explain the twitch. Try using a flat throttle curve without governor.

Grtz,
Dirk

glowster21
06-26-2011, 11:31 AM
Thanks guys. Going to ground the boom and try again. I am using the stock esc, no governor, with a cc pro bec. Didn't realize I had to plug the bls251 into a gyro set at the correct frame rate just to center, great to know. Geez 25 years around this stuff and I still learn TONS every day :noteworthy
Thanks for the info all and I'll get back later with my results. I'm going to fly my Atom now since it's gorgeous, I'll ground later:lolol

blackcataps
06-26-2011, 05:10 PM
If I've learned anything about this hobby, it's GROUND YOUR TAIL BOOM!

Also, get some pure silicone spray for the belt. Spray it every 12 flights or so through the tail box.

I had the same twitch and I didnt know about grounding the boom so after a little research I carried out the grounding at both the front and tail of the heli and sprayed graphite spray on to the belt and I've never had the twitch during the 30 or so flights since. It's an instant fix.

Castel
06-27-2011, 11:59 AM
Hey Glowster, how did it go, did you fix it? How are you liking the 6HV! ?:)

Ah Clem
06-27-2011, 12:03 PM
I had the same twitch (except mine was on the tail, too) after I converted to FBL.

The twitch was completely cured by grounding the boom to the motor mount.

I also treated the belt with silicon, just to be sure.

glowster21
06-27-2011, 01:43 PM
Hey Glowster, how did it go, did you fix it? How are you liking the 6HV! ?:)

I'd love to say everything is all sunshine and roses but I didn't get a chance to ground the boom yet. I was too tied up flying my Atom to work on the 6 :)
Keep you posted, planning on grounding it tonight.

blackcataps
06-27-2011, 02:20 PM
I'd love to say everything is all sunshine and roses but I didn't get a chance to ground the boom yet. I was too tied up flying my Atom to work on the 6 :)
Keep you posted, planning on grounding it tonight.

Flying, fixing? Flying or fixing???

Flying every time for me! Soon be winter with plenty of time to be fixing. :clap

glowster21
07-17-2011, 08:18 AM
Totally forgot to update you guys. Thanks sooooo much for all the guidance and suggestions. Grounding the boom worked, twitch is non existent, bird is AMAZING to fly!!! I cant get over how fast yet controllable she is, absolutely amazing. After I did the grounding I took her up for a basic shakedown hover to make sure the issues were gone. After that, it was on!!! My 11 year old and I had a total "Frank Barone" from Everybody Loves Raymond moment. I took her up high, basic tail in, then went into a series of forward and backward flips. After the first one with my son standing next to me we both shouted at exactly the same time....."HOLY CRAP!" :wow2: we couldn't believe how fast she was.
Thanks to all of you for the suggestions, you rock!

Ah Clem
07-17-2011, 09:31 AM
glowster21,

OUTSTANDING SIR!

Glad that you got the issue corrected and are enjoying your 6HV!

sarpilot
07-17-2011, 06:13 PM
I have been following multiple threads in the hope that I will glean info to fix my problem.... Awesome flying just now 6 flights with big girl and 5 on my 450 gonna tic-toc before I die.....

I am seeing all this grounding success and I thought what could I do to improve mine so although resistance checks were fine I figured grind all the paint off at the boom where lug terminal is for better connection? 4 flights 16 minutes throwing everything I have at it to make it glitch and perfect the whole time.

I am about to pronounce it all better then 5th the same rpm change 1 time, no tail kick anymore which is weird but may be cause no more silicone overdose.....
:arggg:

sarpilot
07-17-2011, 06:29 PM
After 3 years at this I have come to the following hypothesis:
We have all lost our f ing minds......

Trying to make unstable models fly with stability, much less trying to defy gravity with countless tricks and "sleight of hand". Nonstop mechanical issues, bizarre electrical demons which attack us almost daily. Yep we have all gone over the freaking edge....

And I didn't even mention MONEY......

:rotf

Airworks
07-17-2011, 11:37 PM
i grounded boom to motor using a burned out servo , (used the wire from it) soldered a washer on one end , and used one of the motor washers for the motor end, little self tapping screw into the boom , total time taken to do 10 minutes.
static can make anything glitch , doesnt always end in the gyro/tail , can be any servos etc on the heli.