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Old 12-15-2019, 08:45 AM   #1 (permalink)
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Default Wag Question

Wag varies by HS.
Does this tell me something useful in diagnosis?
Like, the tail shaft isn't bent?
Or...
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Old 12-15-2019, 10:22 AM   #2 (permalink)
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Not that I've found. Increasing rpm is basically increasing your mechanical gain. So if you have wag at low rpm, you'll certainly have more at high rpm.

Also I've never had a wag from bent tail shaft or bent tail hubs. Just bad vibes. However on some flybarless units that can manifest itself into a wag.

Slow wag is 99% mechanical issue. Wrong servo horn, wrong servo, stiff mech, bad tail bearings.

Whatcha got going on?
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Old 12-15-2019, 10:25 AM   #3 (permalink)
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Quote:
Originally Posted by RCFred View Post
Wag varies by HS.
Does this tell me something useful in diagnosis?
Like, the tail shaft isn't bent?
Or...
are you asking us to diagnose a bent tail shaft?

ive noticed that using a Mikado heli, I keep my tail endpoints less than 100.. that might mean moving the servo ball out one hole.
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Old 12-15-2019, 10:36 AM   #4 (permalink)
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I'm in the process of throwing the kitchen sink at a wag, so was trying to decide what to throw next. Sounds like sanding the shaft rather than ordering a new one.
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Old 12-15-2019, 11:35 AM   #5 (permalink)
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the logo 550's and 600 have some wag issues.. lots of threads about them.. some people don't have it, like thickfog.. he's lucky
different thrust bearings is a normal fix. as are earlier stock grips.
I would try moving the servo ball out one hole and re-doing the tail end points. might have to back off the tail gain after moving the ball.
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Old 12-15-2019, 11:40 AM   #6 (permalink)
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Donít rule out the governor.
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Old 12-15-2019, 07:00 PM   #7 (permalink)
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Is this a tail wag or a tail kick?
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Old 12-21-2019, 12:10 PM   #8 (permalink)
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So many posts on tail wag on Mikado 500 - 690 Helis. Quotes from some of the posts.

Quote: Based on my experience, the 100% sure fire fix is to throw the stock tail grips in the trash and drop in a pair of Tarot grips. Fortunately the Tarot grips are cheap, a pair of metal grips with bearings and shaft is about $15


https://uploads.tapatalk-cdn.com/201...71e5568cce.jpg
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Old 01-15-2020, 02:55 PM   #9 (permalink)
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Tail wag on logos are normally attributed to the tail thrust bearings. I had a brand new Glogo with a wag and Jesse Kavros had the trick. We removed the brass washers in the thrust bearings and removed some flashing on them. Popped in a new set of thrust bearings and wag was fixed. Hope this helps anyone chasing their logo tail wags.
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Old 01-17-2020, 11:19 AM   #10 (permalink)
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Quote:
Originally Posted by smittylube View Post
Donít rule out the governor.

How about being more explicit? More helpful? What lead you to think it was the GOV. Using VBAR GOV or ESC? Moved gain up or down?
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Old 01-17-2020, 11:40 AM   #11 (permalink)
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Quote:
Originally Posted by RCFred View Post
I'm in the process of throwing the kitchen sink at a wag, so was trying to decide what to throw next. Sounds like sanding the shaft rather than ordering a new one.
Ready to throw the Heli in the sink.....
Troubleshooting this wag for a month.

What has been done;
1. Replaced servo with the servo from my TREX 550.
2. Replaced all the tail parts. Had colleagues at my field check the mechanics for binding. All good.
3. Performed Autotrim.

Haven't moved the ball up. I'll do that next.
Haven't utilized tail optimizer. Waiting for the weather to improve.

How can you tell the issue is with the thrust bearings? Or as someone else posted, check the Governor?

What has myself and others at my field scratching heads, it that for a few seconds the wag stops. I make cyclic or collective movements, the wag starts again.

600SX Vbar/Control and Scorpion Motor and ESC 96mm Edge Tail Blades.

If I can't get this issue sorted out. You'll see this airframe in the classifieds.
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Old 01-17-2020, 12:20 PM   #12 (permalink)
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Don't give up-this a a very good helicopter with (normally) excellent tail performance.

Have you removed the mold seam/parting line from the balls molded into the tail blade grips?

These are still present on current models and can (not always) be the cause of a slow wag. Very carefully sanding them off has corrected the issue for many people (there are old threads on this).

A friend of mine built a Logo 550 last year and it flew great, other than the tail wag. Sanding the parting line off of the balls eliminated the issue.

As someone above mentioned, using the Tarot tail grips (no parting lines on the balls) seems to correct this as well.
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Old 01-17-2020, 01:44 PM   #13 (permalink)
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Quote:
Originally Posted by Ah Clem View Post
Don't give up-this a a very good helicopter with (normally) excellent tail performance.

Have you removed the mold seam/parting line from the balls molded into the tail blade grips?

These are still present on current models and can (not always) be the cause of a slow wag. Very carefully sanding them off has corrected the issue for many people (there are old threads on this).

A friend of mine built a Logo 550 last year and it flew great, other than the tail wag. Sanding the parting line off of the balls eliminated the issue.

As someone above mentioned, using the Tarot tail grips (no parting lines on the balls) seems to correct this as well.
Yes. Thanks. Neglected to mention that.
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Old 01-17-2020, 05:48 PM   #14 (permalink)
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Quote:
Originally Posted by Freeskiken View Post
So many posts on tail wag on Mikado 500 - 690 Helis. Quotes from some of the posts.

Quote: Based on my experience, the 100% sure fire fix is to throw the stock tail grips in the trash and drop in a pair of Tarot grips. Fortunately the Tarot grips are cheap, a pair of metal grips with bearings and shaft is about $15


https://uploads.tapatalk-cdn.com/201...71e5568cce.jpg
Is this the tail grip to use:


http://www.hawk-creation.com/index.p...product_id=258
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Old 01-17-2020, 07:35 PM   #15 (permalink)
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I believe it is this one:

Tarot RC Heli 550/600 tail rotor clamp MK6066 - Tarot Drones | RC Helicopters

You might check the thread on RCG for more specifics:

https://www.rcgroups.com/forums/show...eli-from-Tarot
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Old 01-17-2020, 08:37 PM   #16 (permalink)
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The tarot parts are a direct fit. I am using some to try out.

I guess I'm lucky. 12 logos later, using new grips and bearings, old ones, mixed ones, bad ones. Never had a logo wag.
Weird.

That's
2 550
2 500
1 690
1 570
4 600
1 700
1 480
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Old 01-18-2020, 12:13 AM   #17 (permalink)
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I went through this on a logo 550. Another logo pilot came to watch and 5 seconds after I took off he said land raise Governor gain. Went away snap of the fingers just like that.
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Old 01-18-2020, 08:21 AM   #18 (permalink)
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One of life's paradoxes.


So this: Tarot RC Heli 550/600 tail rotor clamp MK6066 - Tarot Drones | RC Helicopters
Rather than this:

Tarot RC Heli 550/600 Metal Tail Rotor Holder Set MK6078 - Tarot Drones | RC Helicopters
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Old 01-18-2020, 10:16 AM   #19 (permalink)
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Your still going to need the bearings and thrusts with the plastic ones. Putting your current ones in new plastic grips may or may not solve it. However, that would be an interesting experiment to see.
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Old 01-18-2020, 05:28 PM   #20 (permalink)
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The experiments I'll leave to you TF.
I'm more of a 'path of least resistance' guy.
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