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Helicopter Safety R/C Helicopter Safety


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Old 10-26-2017, 05:59 PM   #1 (permalink)
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Default To Loctite or not to Loctite?

Re: To Loctite or not to Loctite?
I am not sure if this is the best place to post this enquiry, but here goes.
I have watched plenty of videos of builders assembling helis and have come to wonder if there is OVERUSE of Loctite?
I appreciate that it is good practice to Loctite the motor into position and to use it on rotating parts like feathering shafts, but is it really needed on every single metal to metal contact?
Any information gratefully received,
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Old 10-26-2017, 08:35 PM   #2 (permalink)
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Not needed if there is a locknut.
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Old 10-26-2017, 09:58 PM   #3 (permalink)
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I am not in favor of using so much loctite that you strip every bolt that you try to remove.
Maybe if you never have to rebuild anything it would be good practice.
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Old 10-26-2017, 10:12 PM   #4 (permalink)
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Small heli's don't vibrate as much and you get away without as much loctite. On big helis, any bolt/screw mating with metal threads should have loctite or you stand a good chance of paying dearly.

IMHO it is not worth the risk, if you think it possibly needs locktite then do it. A club member often forgets to locktite bolts, I have seen some very interesting near crashes and crashes on 600's and 700's from bolts backing out.
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Old 10-26-2017, 10:43 PM   #5 (permalink)
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Last weekend I smacked against the building with an Oxy3+...everything from the rotor hub outward was spread over the lawn...

No damage to the tail boom / tail assembly...

But close inspection revealed 4 of the 6 screws that hold the tail assembly to the boom...were loose

Every one had (blue) Loctite..."two fingers tight" makes it easier to loosen
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Old 10-27-2017, 12:16 AM   #6 (permalink)
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I'd turn the question around and ask why you wouldn't use Loctite on every screw (into metal)? I've seen too many helis crash due to the builder forgetting to Loctite.
Perhaps on some screws you could get away without it but figuring which screws need it and which dont would be a hit and miss affair at best, why take the chance? As long as you use the blue type, dont over-tighten and use quality wrenches they will come out ok when you need to do maintenance.
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Old 10-27-2017, 04:49 AM   #7 (permalink)
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Quote:
Originally Posted by Grumpy_Old_Man View Post
I'd turn the question around and ask why you wouldn't use Loctite on every screw (into metal)? I've seen too many helis crash due to the builder forgetting to Loctite.
Perhaps on some screws you could get away without it but figuring which screws need it and which dont would be a hit and miss affair at best, why take the chance? As long as you use the blue type, dont over-tighten and use quality wrenches they will come out ok when you need to do maintenance.
Many thanks to all who have responded. As one grumpy old man to another I shall take the advice offered above and Loctite all metal to metal.
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Old 10-27-2017, 06:54 AM   #8 (permalink)
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Quote:
Originally Posted by fastflyer20 View Post
Small heli's don't vibrate as much and you get away without as much loctite. On big helis, any bolt/screw mating with metal threads should have loctite or you stand a good chance of pay dearly.

IMHO it is not worth the risk, if you think it possibly needs locktite then do it. A club member often forgets to locktite bolts, I have seen some very interesting near crashes and crashes on 600's and 700's from bolts backing out.
I'm thinking the amplitude of the vibration would be less (less mass), but the frequency would be higher since things (blades, gears, motors, etc.) are rotating much faster.
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Old 10-27-2017, 06:56 AM   #9 (permalink)
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Sorry, duplicate.
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Old 10-30-2017, 10:30 PM   #10 (permalink)
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Quote:
Perhaps on some screws you could get away without it but figuring which screws need it and which dont would be a hit and miss affair at best, why take the chance?
There is no hit or miss. If there is a lock nut present or screwing into plastic, you do not use loctite. If you screwing metal into metal with no lock nut, then you apply a minimal amount of loctite. Typically blue is sufficient.
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Old 10-31-2017, 06:17 AM   #11 (permalink)
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Quote:
Originally Posted by Solmanbandit View Post
There is no hit or miss. If there is a lock nut present or screwing into plastic, you do not use loctite. If you screwing metal into metal with no lock nut, then you apply a minimal amount of loctite. Typically blue is sufficient.
Which is what I said if you had quoted the whole post.
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Old 12-03-2017, 03:35 AM   #12 (permalink)
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Quote:
Originally Posted by ic-racer View Post
Not needed if there is a locknut.
Locknuts aren't actually that great at preventing unthreading due to vibrations.

While this video is a marketing piece for locking hardware, the Junker-Vibration test is valid, and the results are accurate.

https://youtu.be/IKwWu2w1gGk?t=1m30s

Various locking methods are tested.

Suitable thread locking compound is superior, and if the correct release torques are selected for the application, there's no reason for them to become excessively difficult to undo.
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Old 12-24-2017, 01:51 AM   #13 (permalink)
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Just use a tiny amount and use blue. Use a toothpick and just put on enough to to coat the first 3 or so threads. Locktight should be used all the time on any size heli.
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