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Goblin 280 SAB Heli Division - Goblin 280 Helicopters


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Old 07-10-2019, 02:04 PM   #61 (permalink)
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Originally Posted by echopoint View Post
I have ordered a SAB tail servo to replace my BK servo. I will see if that helps the problem.
Please let us know what it does.
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Old 07-15-2019, 01:37 PM   #62 (permalink)
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Wow. Replacing the tail servo is quite the pain! I have the servo replaced and just need to put everything back together and do a flight test.

Just curious how many people with the shaking issue are using the ESC gov versus the brain Gov. I am using the ESC Gov, and am considering making a cable to use the brain gov. But I will test with just the servo replacement first.
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Old 07-15-2019, 02:07 PM   #63 (permalink)
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I am using the Ikon2 governor.
When I first started working on the issue, I was told to try without the governor altogether, and I did with no change. I haven't tried the esc governor.
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Old 07-16-2019, 08:15 AM   #64 (permalink)
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Thanks for the info. I will see if the change in servo helps.
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Old 08-13-2019, 12:03 AM   #65 (permalink)
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I too am having this issue on my Havok am using Spirit fbl.
Wondering if esc setting has anything to do with it.
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Old 08-13-2019, 01:45 AM   #66 (permalink)
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I too am having this issue on my Havok am using Spirit fbl.
Wondering if esc setting has anything to do with it.
Funny you mention this as I was thinking the same thing just this weekend. After going through my tail several times the action on the slider is super smooth, will slide down under it's own weight. Ball links are not tight. Boom is solid. Bearing assembly correct in tail grips. So I was messing with gains, spirit as well, just can't seem to beat it. I went as low as 45 and settled around 55, for now. But it's still there so I started to think about disabling esc gov and using spirit gov to see if there's any difference.
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Last edited by blarks; 08-13-2019 at 03:33 AM..
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Old 08-13-2019, 02:12 AM   #67 (permalink)
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With all the upgraded goodies that's already on the Havok, this was the last thing on my mind Blarks. That 3m tape comment does make some sense to me, will give it a try & see what happens.
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Old 08-13-2019, 03:36 AM   #68 (permalink)
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With all the upgraded goodies that's already on the Havok, this was the last thing on my mind Blarks. That 3m tape comment does make some sense to me, will give it a try & see what happens.
Yes please report back if you try it and results. Seems so many people have this problem with the fireball there has to be something causing it. I'm not sure the backlash in the motor and shaft has anything to do with wag as once its spooled the lash would be gone as there is constant forward force, but anything's possible at this point.
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Old 08-13-2019, 06:36 AM   #69 (permalink)
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Isn't it strange that Sab isn't issuing any tech advice. I suspect if gov is disengage the issue will be solved & perhaps a firmware update.
As there's no owb I believe Sab uses the back lash as a sort of anti lag
device to help maintain proper hs under gov control.
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Old 08-13-2019, 07:12 AM   #70 (permalink)
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Quote:
Originally Posted by jchen View Post
Isn't it strange that Sab isn't issuing any tech advice. I suspect if gov is disengage the issue will be solved & perhaps a firmware update.
As there's no owb I believe Sab uses the back lash as a sort of anti lag
device to help maintain proper hs under gov control.
Yeah I don't know if there's anything about it on their FB page but I don't use FB and don't care to so wouldn't know but it would be nice if we could find a solid solution. i do find it surprising that so many people have had the problem and what seems to work for one may not work for another. I have 2 flying, one has stock setup and other is stock with savox servos and both have the same wag. I have 2 oxy 2's, an oxy 3 and a goblin 380 and all fly fine, the oxy 3 did have a small wag but after some mechanical tweaks it's fine. I was going to buy new thinking my 2nd hand ones were at fault but I'm not sure now.

I will try the fbl gov this weekend to see if there's any change.
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Old 08-13-2019, 08:25 AM   #71 (permalink)
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I had mine on the Ikon2 governor, and also tried with no governor, and saw no change.
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Old 08-13-2019, 01:13 PM   #72 (permalink)
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I had mine on the Ikon2 governor, and also tried with no governor, and saw no change.
hmm ok, there goes that idea. Did you try the 3m tape inside the coupling area as was suggested?
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Old 08-13-2019, 03:59 PM   #73 (permalink)
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I had mine on the Ikon2 governor, and also tried with no governor, and saw no change.
Just wondering if you’ve looked at your vib logs. When I built my fireball, the motor side tail pulley was plastic and distorted when it was mounted. I replaced it with the Lynx aluminum. I wonder if the tail pulley (on the motor) is causing some of these issues.
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Old 08-13-2019, 10:18 PM   #74 (permalink)
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Just wondering if you’ve looked at your vib logs. When I built my fireball, the motor side tail pulley was plastic and distorted when it was mounted. I replaced it with the Lynx aluminum. I wonder if the tail pulley (on the motor) is causing some of these issues.
Interesting. I never considered this and just thought of the alloy pulley being bling, thanks JimJW, something else to check out.
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Old 08-14-2019, 04:59 AM   #75 (permalink)
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Haven't looked at the logs and haven't tried the tape in the couple yet. I guess I could try this and see what happens.
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Old 08-14-2019, 06:19 AM   #76 (permalink)
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Hi Guys
Found a partial solution to tail wag. This Im afraid might be specific to Spirit fbl users only, I not longer have tail wag in hover. The key is to move the servo ball link to the outer most of the servo horn. Rudder end points should be around 90/125. But in FF I have tail wag have to decrease gyro gain down to around 40 for 60% throttle & 31 for 70% throttle.
Had an email exchange with Tomas & he suggested to increase piroutte consistency to 170 & to try rudder revo mix between 3-4.
Will report back if the recommendation will works.
For other FBL perhaps you guys can try with moving the ball link to test.

Cheers
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Old 08-14-2019, 06:59 AM   #77 (permalink)
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Quote:
Originally Posted by jchen View Post
Hi Guys
Found a partial solution to tail wag. This Im afraid might be specific to Spirit fbl users only, I not longer have tail wag in hover. The key is to move the servo ball link to the outer most of the servo horn. Rudder end points should be around 90/125. But in FF I have tail wag have to decrease gyro gain down to around 40 for 60% throttle & 31 for 70% throttle.
Had an email exchange with Tomas & he suggested to increase piroutte consistency to 170 & to try rudder revo mix between 3-4.
Will report back if the recommendation will works.
For other FBL perhaps you guys can try with moving the ball link to test.

Cheers
Thanks jchen. I had gone down 45% at 75% throttle and from memory I think it was worse but will have another go on the weekend. Let us know if you have any luck in the meantime.
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Old 08-16-2019, 06:21 PM   #78 (permalink)
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So I tried a few things today, Tried gains from 25 to 65 and really didn't see a lot of difference, have it at 45 at the moment as a happy medium. Tried revomix from 0 to 10 with again not a lot of difference, put it back to 0. Tried rudder delay from 0 to 6, again not much difference. None of these seem to rid the wag altogether. I haven't got another servo horn at the moment to try the wider distance as mentioned above. So jchen if you have tried the outer servo hole let us know if it made any difference. At the moment I'm still at a loss as to what to do.

Has anyone else tried the 3m tape idea in the motor coupling area to see if this has made any difference to their wag?
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Old 08-16-2019, 08:03 PM   #79 (permalink)
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I had my tail gain at 23 with ikon2 gov with Futaba tape. My vib log was vey low. I also sanded the tail shaft so it was glassy smooth. Plus I’m not a very good pilot and can’t push a heli to its limits
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Old 08-16-2019, 08:05 PM   #80 (permalink)
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I had my tail gain at 23 with ikon2 gov with Futaba tape. My vib log was vey low. I also sanded the tail shaft so it was glassy smooth. Plus Iím not a very good pilot and canít push a heli to its limits��
Did you have wag and did the gain at 23 fix it?
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