380 Tail grip bind - Solved - HeliFreak
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Old 01-14-2018, 09:01 PM   #1 (permalink)
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Default 380 Tail grip bind - Solved

I am recently replacing most of the tail components except the tail box and tail box cover from a crash. Both the spindle and grips are new, but something is lightly binding up in the grip. I thought it was that the tri-flow synthetic grease was too thick, but I cleaned that off, and used white lithium which is considerably thinner. However it still will bind up.
The grip feels great when it is just assembled, but when you spool it up, it gets the slowish mechanical wag. I pull it apart, and one grip is tight now. I've tried switching the shims, switching the order of the 2x5x2 bearings, and still, it will tighten up. Without the grip, I will stack the bearing assembly on the spindle and it feels great. I'm wondering if i have a grip that was cast incorrectly. The bearings are really tight to load into the grip.
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Last edited by Dowquest; 01-17-2018 at 08:39 PM.. Reason: Found issue
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Old 01-15-2018, 12:25 AM   #2 (permalink)
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Make sure the tail pitch bushings are installed properly. (MSH 41176)

They both need to be right or you will get the slow wag.

ROG
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Old 01-15-2018, 07:56 AM   #3 (permalink)
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They are, you can see them in the picture, also have a paper width of space to be sure they are not too tight. Also, you can see in the picture the grip is loose, with the blade at 90į, and the grip has enough resistance to hold the blade out without dropping. The other grip rotates freely and falls with the weight of the blade. The bearings all feel good, I've been working on this for a week.
I'm thinking I'll get some 600-800 grit sandpaper and try smoothing out the shims in case 1 has a bur. It's gotta be something small.
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Last edited by Dowquest; 01-15-2018 at 08:40 AM..
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Old 01-15-2018, 03:06 PM   #4 (permalink)
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After sanding the shims and the outsides of the thrust bearings, the issue still exists. I think it is a bad bearing that came with the new grip set. I can hear and feel a very small pop when pulling on the grip, and then it tightens up.
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Old 01-15-2018, 03:11 PM   #5 (permalink)
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How much in/out movement do you have on your grips, out of interest? One of mine pulls out about 0.5mm and the other doesnít....normal?


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Old 01-15-2018, 05:11 PM   #6 (permalink)
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Quote:
Originally Posted by AndyO View Post
How much in/out movement do you have on your grips, out of interest? One of mine pulls out about 0.5mm and the other doesn’t....normal?


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So, the grip only slides out until it catches on the bearings,(It's kind of a one way shoulder, that uses centrifugal force to hold it in the out position) but can slide in until it hits the hub out of position.
Does that make sense? you can only pull it out until it catches on the shoulder in the grip, but can push it in, out of position.

If you look at the picture i posted, the grip are in their flying position, bearings against the shoulder on the inside of the grip.
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Old 01-17-2018, 08:20 AM   #7 (permalink)
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Is your thrust bearing installed correctly? I only ask cause my recent pack of tail blade grips came with thrust bearings that are marked incorrectly. The larger inside diameter should be inside not outside

Maybe worth a shot
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Old 01-17-2018, 09:24 AM   #8 (permalink)
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Interesting Colin....I am using the original pre-assembled tail assembly from the kit, I think Iíll take it apart and double-check everything


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Old 01-17-2018, 08:37 PM   #9 (permalink)
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Quote:
Originally Posted by Colin Broughton View Post
Is your thrust bearing installed correctly? I only ask cause my recent pack of tail blade grips came with thrust bearings that are marked incorrectly. The larger inside diameter should be inside not outside

Maybe worth a shot
That is the email I received last night from Alex. And is the case. I never even looked for that, just went by the markings. Any way, I'm charging my packs for it, and it'll be my flights tomorrow. Looked to be holding solid tonight after making the swap, it was a little dark, but looked good.
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Old 01-17-2018, 08:52 PM   #10 (permalink)
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Good to hear it's sorted
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Old 01-23-2018, 03:58 PM   #11 (permalink)
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I had thrust washers marked incorrectly as well. And I had tail grips that were so tight on the thrust bearing that I had to force the thrust bearing assembly in. I had two sets of badly moulded (internally sized) tail grips.
which caused the slow wag.
The heli was flyable but just annoying after spending out a lot!
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Old 01-23-2018, 04:36 PM   #12 (permalink)
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I took my grips off the hub and couldn't get the bearings out to check if the thrust washers were correct, gave up after realising that it was going to take a LOT of force....I've ordered a new set to make up myself.

I have already dialled out a lot of unwanted/erratic tail movement in a nose-to-the-wind hover, but there's just that little bit of me wanting to check the thrust-bearings anyway, but I'm not forcing them out until I've got a complete new set of bearings and grips on hand too!
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