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HelicopterMain Discussion › CAUTION Permatex locktite!!!
03-23-2009 01:08 AM  8 years agoPost 1
smallplanes

rrElite Veteran

S.C. ,SSA

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Do not use the Permatex Medium Strength Threadlocker Blue GEL. I used this locktite on my servo horn bolts on my brand new Trex 700 and i was on my third take off when all of a sudden the heli fliped forward on our cement heli pad and tore my Radix 690 main blades and my align tail blades to pieces. I was very pissed off so i walked up to the heli to see what had happened and one of the CHEAP align servo wheels was slam off the elevator servo and the bolt and grip washer was laying on the pad. I got it back to the table and checked the other servos and everyone i could turn the bolts with my hand. I cleaned my bolts in denatured alcohol and i cleaned the servo threads also,well when i picked the bolt up the locktite was still wet it had not hardened and it was like this one all the servo bolts. I've had the locktite on the bolts for about two weeks now so i know it should have been hard. A friend of mine was also tesing his Trex 600 NSP and he had a lot of bolts back out on him to and he used the same locktite. I know for sure i had locktite on the bolts as you could see the wet locktie still on the threads and the end of the bolt. Well now i'm going to have to get a new set of blades and i'm also going to change the horns to ether the hitec servo wheels or the cnc aluminum servo wheels from Ron's. Has any body else had there bolts back out using this brand of locktite? I'm going to have to pull the main shaft to make sure its not bent. I'm not very happy at this moment.

Thanks


Spectra G 26cc
Jewel
Bat 27cc
Trex 700<br

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03-23-2009 01:21 AM  8 years agoPost 2
LaurenceGough

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Reading, UK

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I think it's safe advice to say use only Loctite threadlocker.

Also sorry to hear about your crash .

www.laurencegough.com
Sponsors:
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OPTIFUEL
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03-23-2009 01:23 AM  8 years agoPost 3
LONEWOLF2440

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MYRTLE BEACH S.C

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Darn that sucks

MIKADO LOGO 600 TREX 550

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03-23-2009 01:28 AM  8 years agoPost 4
baddynergy

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sierra madre, ca-​usa

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cnc aluminum servo wheels from Ron's
Dont use the aluminum servo horns. In a crash you need to have a part that will give. Better the servo wheel than the gears in the servo IMHO.

**Unattended children will be givin a shot of espresso and a puppy**

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03-23-2009 01:29 AM  8 years agoPost 5
empty1

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chicago,ill

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Not a chemist but the way it was explained to me was locktite reacts with the metal. Unfortunately it does not react with all metals. See http://www.devcon.com/prodfiles/pdfs/fam_tds_350.pdf and note alot of screw come plated with zinc or cadmium. I am sorry about your crash.

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03-23-2009 01:32 AM  8 years agoPost 6
Pureadrenalin

rrApprentice

Waipahu,Hi. 96797

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So what is the answer to this? I looked on heliproz and they have all sort of different versions. What is the most widely used locktite threadlock?

hammerhead_customs

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03-23-2009 01:35 AM  8 years agoPost 7
Duckster

rrApprentice

Brunei

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i use the same brand with quick uk roller horn got no problem soo far i flew about 5 gallon through it and happy with it check all the linkage and bolt before and after flight, got once my servo screw flown off but i didnt put a loctite on it

Trex 600,700 AND 450, GY611, GY401, OS5H, OS91HZ, MGP, HS65HB, Scorpion 2221-8,

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03-23-2009 01:35 AM  8 years agoPost 8
tukkus

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ma

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I've used the Permatex gel on my Trex 600n and haven't had any problems.

I've also taken some screws out to upgrade parts and the gel has worked liked it's supposed to. Maybe you got a bad batch, it's hard to say.

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03-23-2009 02:07 AM  8 years agoPost 9
carzan

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Lone Star State

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???

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03-23-2009 02:23 AM  8 years agoPost 10
TaleGunner

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Deer Park WA

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Bummer maybe they had a bad batch
I only use the permatex blue gel and have never had a problem.

CRASH! GLUE! REPEAT!
Spectra-G, Ion X-2

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03-23-2009 02:23 AM  8 years agoPost 11
smallplanes

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This is the very first time in my whole hobby carrier that i have EVER had a horn to come off and it was only on the third flight. Well it would have been the third flight i flew it twice yesturday and none today. Why does this have to happen to me,i'm so tired of having problem that i could just cry like a girl. It hurt me very bad today to see that happen it was kinda like a family member had died. The only good thing that happened was it never got airborn,had i been flying it would have cost me hundreds of dollars to get it fixed. I know one thing i'm not going to take off on the cement pad any more had i been on the grass it might have not got my blades. Do you guys think i could use a soring and quirt denatured alcohol up into the threads of the servo to clean out any oil from when it was made? The thing is my buddy had a lot of his bolts back out also on his 600 and we both flew ours for the first time yesturday and we used the same type of threadlocker.
I had the bolts tight i took the phillips bolts out and put allen head bolt in so i could tighten them up better with out the head stripping out. I was getting low on money from this build now i need more blades and maybe a main shaft. I've been building a gasser at the same time and man has it been bad on the wallet. I will never build two helis at the same time again.

Thanks for the replys


Spectra G 26cc
Jewel
Bat 27cc
Trex 700<br

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03-23-2009 02:51 AM  8 years agoPost 12
dave75d

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Jacksonville, FL

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that sucks, blades are expensive for something you didnt put in the dirt.

ten grand in helis and all i can do is hover

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03-23-2009 03:40 AM  8 years agoPost 13
Isaac F

rrKey Veteran

Panama Republic of​Panama

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Not a chemist but the way it was explained to me was locktite reacts with the metal. Unfortunately it does not react with all metals. See http://www.devcon.com/prodfiles/pdfs/fam_tds_350.pdf and note alot of screw come plated with zinc or cadmium. I am sorry about your crash.
I agree with empty1 on the coment above.... Also I read somewere that if you use stainless steel screws it can happend the same. It has to be with the way the locktite liquid react to the metal to dry and make a bond

Good luck,

Isaac

Speed of light is greater than speed of sound. Some people seem very bright until U hear them speak

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03-23-2009 05:21 AM  8 years agoPost 14
X-Gear LLC

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klamath falls, or

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what ever threadlock/sleeve retainer you decide to use, make sure it is anerobic (hardens with the absence of air), there may be metal reactive threadlockers out there, but unless you are a metallugist and can identify the metal, i wouldn't recommend them. You can never go wrong if you have the right strength anerobic thread lock and clean degreased parts.

Permatex is a very reputable brand and i've never had any trouble using their correct product in the correct manner.

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03-23-2009 06:16 AM  8 years agoPost 15
dkshema

rrMaster

Cedar Rapids, IA

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Technical Data Sheet:

http://www.permatex.com/documents/t...otive/24010.pdf
PERMATEX Medium Strength Threadlocker BLUE Gel is a medium strength anaerobic threadlocking gel conveniently packaged in a new Gel Twist or Gel Squeeze applicator. The product, like its liquid counterpart, is a single component, anaerobic gel that cures when confined in the absence of air between close fitting metal surfaces, ideal for all 6mm to 25mm (1/4 inch to 1 inch) diameter threaded assemblies.
Perhaps you need larger bolts for your ball links.

-----

Of course, even the normal blue stuff is designed for large diameter bolts. For hobby stuff, the PURPLE would be the right stuff:

http://www.permatex.com/products/Au...cker_PURPLE.htm

-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz

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03-23-2009 08:30 AM  8 years agoPost 16
asm

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California

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Not sure how long you waited to fly after the loctite was applied, but I remember there are minimal curing time require for most loctite. I beleive it can be as short as 15 minutes, but most won't develope full rated strenght until 24 hours later.

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03-23-2009 08:46 AM  8 years agoPost 17
30636086

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Tacoma, WA

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Not sure how long you waited to fly after the loctite was applied, but I remember there are minimal curing time require for most loctite. I believe it can be as short as 15 minutes, but most won't develope full rated strenght until 24 hours later.
Its says that product sets on 20 min and cures on 24 hrs. But there could be few factors that will determine the reaction; like the product not been shaken and it had set to the bottom of container? temperature when applied? time allowed to react? contaminants on the surface? and so on! But the bottom line is; that sucks, no questions about it!

I witness a similar accident last week and I just took my heli to the bench and went tru the entire heli; making sure that everything was were it was supposed to be and like it supposed to be.

Sorry to hear about it and hope it will be the last.

I dont suffer from mental iIlness, I actually enjoy mine!

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03-23-2009 09:03 AM  8 years agoPost 18
mchammer

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California,USA

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Also I read somewere that if you use stainless steel screws it can happend the same
loctight,wurth, and permatex threadlocker all work well on stainless steel.

I have used tons of the permatex brand blue threadlock on model helis with no problems at all. I have never used the gel type though. I think it is a new product.

Peace Through Superior Firepower!!!

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03-23-2009 09:10 AM  8 years agoPost 19
ch-47c

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san jose, ca

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I have used tons of the permatex brand blue threadlock on model helis with no problems at all. I have never used the gel type though. I think it is a new product.
I agree. Used it since 1972. No problems.

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03-23-2009 02:15 PM  8 years agoPost 20
smallplanes

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S.C. ,SSA

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asm I waited two weeks. I think that should have dried by then. I've used this type locktite on many helis (a different bottle) and i have never has the center horn bolt to loosen on me,as a matter of fact they always been hard for me to get back out thats why i use allen head bolts now in my servos. BTW there black steel not stainless.

Thanks for all the input


Spectra G 26cc
Jewel
Bat 27cc
Trex 700<br

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HelicopterMain Discussion › CAUTION Permatex locktite!!!
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