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HelicopterMain Discussion › Saved Crash-R50 Tail Yoke..
12-16-2003 01:23 AM  13 years agoPost 1
kauaison

rrApprentice

Alameda, CA

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Yesterday while flying i noticed that my heli required more and more left rudder to keep it straight, upon my first 'nose-in' emergency landing i found the tail yoke (metal) that screws onto the brass sleeve had loosened it self (held on by 1 thread!!). I could see the left over red locktite on the threads which was discouraging...

Now i know that in normal flight, the torque applied to the tail should tighten this yoke onto the sleeve...only conclusion is that maybe it loosened on decelleration or by vibration...

Just curious if this has hapened to anyone? seen one post regarding this,,,and they were using blue locktite

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12-16-2003 01:31 AM  13 years agoPost 2
RappyTappy

rrProfessor

North Denver, Colorado

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Use the plastic tail yoke, it works better

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12-16-2003 01:40 AM  13 years agoPost 3
RobG

rrApprentice

Duncan BC. Canada

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Not only is the plastic better, but also very cheap to replace when the inevitable happens. Somethings gotta give.
I've never had one come loose either.
Rob

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12-16-2003 01:09 PM  13 years agoPost 4
Drunk Monk

rrProfessor

Preston, UK

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Well I noticed quite a bit of play in mine where the slider connects to the plastic arm underneath which was making it wag a little in backwards flight. So I thought I'd upgrade to the metal pitch slider which is a better fit. Threadlocked the metal slider onto the brass fitting, went flying and one flight later just as I was bringing it in to land at about 2 feet in the air the heli did a nice piro right into the floor after checking I found that the metal slider had unscrewed altogether. Crash damaged was NHP main and tail blades, main shaft, feather spindle, fly bar. Not too bad all things considered.

So I decided to put my plastic one back on flew it again, landed after 2 mins to check it (I was feeling a little paranoid) and what do you know it had unscrewed itself again and was hanging on by a couple threads! Typical, so I locktited it on again with 5 min stuff but left if for an hour and half and I couldn't move the thing with pliers this time so I thought that must have gotten it. Went flying again, 2 mins later the bloody thing started to piro but i manage to get it down only knocking the ends off my tail blades, went to look and the thing had unscrewed again It just wasn't my day, only thing I can think of is that it was that too cold for my epoxy so it didn't bond properly.

I know the QWW tail is pretty naff but one good thing about it is that the pitch slider dosen't screw on to the brass fitting but there is a round nut that fastens on to brass bit which keeps everything nice and tight. This seems a much better idea and even after i went back to a standard tail I kept that bit on.

I suppose the moral of the story is, if it isn't broken don't try to make it better Guess ya learn the hard way......


Stephen

I only open my mouth to change feet.....

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12-16-2003 01:15 PM  13 years agoPost 5
Doug

rrElite Veteran

Port Saint Luice Florida....

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This is a "Blingless" area

First member of Member of Bearings Anonymous

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12-16-2003 01:44 PM  13 years agoPost 6
Drunk Monk

rrProfessor

Preston, UK

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Well I got the Quick UK pulley guide and tail shaft with pulley and I did replace the pins with the ones with e-clps so it isn't totally without bling


Stephen

I only open my mouth to change feet.....

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12-17-2003 01:45 AM  13 years agoPost 7
kauaison

rrApprentice

Alameda, CA

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Coincidentally it was very cold (35-40's) when i went out, from my warm room (70+)...i also was in some 2inch thick wet grass when i landed so i know that probably unscrewed my metal yoke off all together...maybe the temp has a bigger part in this...is the expansion/contraction of brass much different than cast alluminum?

Something CA can fix? does it really need to be blingless?

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12-17-2003 11:02 AM  13 years agoPost 8
Drunk Monk

rrProfessor

Preston, UK

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Well i tried an experiment yesterday with an old metal pitch slider. I put 24 hr expoxy on the brass thread and screwed on the metal fork part to the brass and left it all night. This morning I tried to unscrew it and couldn't so put a 7mm spanner on one end of the brass fitting and tried to turn the metal forked part at the end and the brass bit sheared off inside the slider. So I think it's safe to say that the glue held I didn't twist it with that much force which is a little worrying though. So I guess it must have been down to the cold why they came off in flight

I've re-glued a new slider this morning and won't be flying till weekend which will be plenty of time for the glue to set properly and if it comes of this time I'm going to be more than a littled anoyed. I'm just wondering if it's the glue I'm using. Haven't used it before but bought it from my LHS last week and I know he's sold a lot of it. What i did notice though was when my pitch sliders unscrewed and my heli came down the pitch slider and shaft where very warm?


Stephen

I only open my mouth to change feet.....

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12-17-2003 11:47 AM  13 years agoPost 9
Al Magaloff

rrMaster

12,199 Posts- Enough Time Wasted. See Ya!

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The plastic stock one works just fine. I have never had an issue with the many I have running. They can never unscrew if put together with care. No glue/epoxy/red LocTite needed. You smash the tail, they break. On the new Rap90, the metal slider has threads cut into it, for the brass sleeve. Something the cheesy "upgrade" one does not.

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12-20-2003 04:17 PM  13 years agoPost 10
crash1953

rrVeteran

Washington State

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I found that if you put a metal yoke on the tail ,You have to use red locktite to keeo it on .. Also I primered the brass and the yoke first with locktite primer .. On the use of a plastic yoke ,NEVER reuse one or back it off once you started it on ..For some reason if will always fly off if you do .. I take great pains to put that part on now .. I lost one reusing it yrs ago ..Hard and qucik lesson ..Also if you use locktite just a very small amount will do .. It is really hard to keep it out of the bearings there ..

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12-20-2003 04:22 PM  13 years agoPost 11
Drunk Monk

rrProfessor

Preston, UK

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I'm still waiting for a new tail shaft so i've had a week to get that bit perfect now. I've gone back to the plastic one and put a little locktite on it, it ain't going anywhere this time


Stephen

I only open my mouth to change feet.....

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12-28-2003 06:16 AM  13 years agoPost 12
kauaison

rrApprentice

Alameda, CA

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Ok, i noticed that the red loctite was only getting on the bottom couple of threads of the sleeve, so i really cleaned everything, put red loctite on the sleeve and yoke, made sure none in the bearings. After it dried i put some thick CA on the visible threads and let it sit under a lamp for a couple hours.....so far i put a gallon on it and have no probs...

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