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Other › My 120deg Align swash seized in flight!
05-03-2005 09:33 AM  12 years agoPost 1
Paul_C

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Limpopo, South Africa

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There I was, beautiful day and the second flight with the Astro 020 heli motor, and this thing is going like a rocket, putting any raptor I’ve ever seen completely to shame, then suddenly, I have no cyclic control and had to just watch as it went in nose first.

No, it wasn’t the bearing, it was the little aluminium gimbal ball, it suddenly just seized up resulting in a completely stiff swash, those little servos had no chance of moving that swash, it’s really really stiff! I don’t understand it, that swash looked like a good quality piece of work, moved very freely with no slop – anyone else had such an experience?

Also, how do you get the swash apart? I’d really like to have a look inside to see what made it go stiff.

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05-03-2005 10:37 AM  12 years agoPost 2
MFIS

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The Netherlands

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Paul,

I had the same thing happen to me and made a post here about it. The swash is salvageable. For me i just oiled and greased it really good and found that there was some metal slivers inside where the ball is. You can just rotate it to get them out. Then oil it REAL good and just work it hard in all directions till it runs smooth again. This is what i did and i havent had any problems since then.

The metal on metal design is just the issue i think. If a foreign object gets in there you have a problem if you havent oiled it real good and thats what happened to me. I didnt bother to oil it out of the box. I would bet you did the same.

Cheers,
Anni

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05-03-2005 11:46 AM  12 years agoPost 3
Paul_C

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Limpopo, South Africa

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Yip, all the linkages were still on, the anti-rotation guide (situated in front of main mast) is still on and intact, even the feathering spindle appears to be perfect, I can’t see any signs of damage to the swash due to the impact – the canopy and my quite sturdy diy battery tray absorbed most of the energy - plus, I can find no other reason for what happened, I’m using eCCPM and still had collective control, so the servos were and still are working.

Anni: You’re quite right, I did not oil the swash, I just took it out of the box, admired it’s quality for a moment, and slapped it onto the main mast. When I now force the swash to tilt by hand (and it does take some force!), it does feel like something is grinding, like some metal is stuck in there, – I’ll have a closer look and see if I can get the foreign artefact out. But then, aren’t you left with a little slop? Doesn’t the oil mix with dust and help the gimbal wear out faster?

Is there no way to separate the bottom and top half of the swash? I still have a brand new standard swash (alu top, plastic bottom), if I could just change the top half, my 120deg swash would be as good as new.


Thanks…

Paul C

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05-03-2005 01:42 PM  12 years agoPost 4
WRXRonald

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Auburn, OH

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...
yeah sounds to me like a foreign object has found its way in there.....

but i don't know that oiling it much is a good practice... we've all seen how much that adding oil to anything can just be a recipe for gathering dirt, dust and grime. so adding oil will certainly be likely to pull dirt in their, and as the oil starts to dry, you might end up with another seize.

i'm not saying don't do it, and it appears to have worked for annihila.... just remember constant and preventative maintenance... keep checking that ball and its free rotation and make sure its free of foreign particles.


and thanks for the warning-- i'll be sure to keep a close eye on mine too in the future.

Good Day: crashed thx to dumb thumbs. Bad Day: crashed mechanical malfunction. Every Day: CRASH :)

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05-03-2005 03:19 PM  12 years agoPost 5
Gary Hoorn

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Annapolis Maryland USA

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Maintenance
I put a couple of drops of Triflow on my swash ball before every flying session. Same with the tail pitch slider, mainshaft at the washout base, the flybar seesaw bushings and the collective rocker bushings. This to me is just standard maintenance like cleaning and checking the Heli after each flying session. These are not things that you can just fly and ignore.
Gary

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05-03-2005 03:25 PM  12 years agoPost 6
WRXRonald

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Auburn, OH

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agreed...
i also am now putting the silicone lube on the belt... can feel that it is a smoother movement of the tail along with belt... hoping this helps with amp draw and maybe wag too? who knows.. but gary is right... you can't just expect to walk to the field and fly daily w/out spending a sharp eye on constant preventative maintenance.

Good Day: crashed thx to dumb thumbs. Bad Day: crashed mechanical malfunction. Every Day: CRASH :)

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05-03-2005 06:32 PM  12 years agoPost 7
Helichomper

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san diego,ca

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I use spray siicone lube on all moving parts after each flight and I have never had anything bind. It doesn't leave any mess either. great stuff

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05-03-2005 06:48 PM  12 years agoPost 8
roboto65

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Conroe,TX

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Would spray it out with nitro cleaner then oil it up

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05-04-2005 10:17 AM  12 years agoPost 9
Paul_C

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Limpopo, South Africa

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I’m all for maintenance and do in fact check my machines regularly, a swash seizure was simply something I never imagined could happen.

Well I had a closer look at the swash, could find no reason or pieces of metal or anything – it’s just really stiff. I also noticed that on the standard swash supplied with the kit, the ball is indeed lightly greased.

I also managed to get the hub and bearing out of the std swash base and put it on the 120deg base, so I now have a new 120deg swash again. The bearing actually came out of the base real easy, especially on the plastic one.

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05-04-2005 11:23 AM  12 years agoPost 10
idleup1

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rockwood,mi

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I had one seize also. Lack of lube. ball was scored but rest ok.I stole a ball from old plastic swash ,locklited together and lubed with silicone grease, no more problems.

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05-06-2005 03:55 AM  12 years agoPost 11
monts

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San Diego Ca

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Mine just froze on my 2nd flight! Bummer

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05-06-2005 04:25 AM  12 years agoPost 12
j5coat

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Phoenix

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are you guys oiling them before you use them? i just got mine today and it seems really smooth, just wondering if i should get some triflow and oil it. i fly in the dirty desert i dont think oiling will help me much with all the dust at the field.

Trex 700, Trex 600n

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05-06-2005 06:38 AM  12 years agoPost 13
lloyd

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Perth,Australia (South African)

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hi paul
i use prolong oil in a syringe with needle and oil both swash and tail shaft.good to go.
lloyd
P.E
trex,TP 2100,cc35,Neu motor,11t,gy 240,3xhs 56,1x3801 futaba on tai

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05-06-2005 06:54 AM  12 years agoPost 14
monts

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San Diego Ca

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My swash felt great while building. I didn't think it needed any lube. My first T rex never had a problem.

Now, 2nd flight on the new bird and it froze solid. I lubed it and it is almost as new. I may try it again but might get a new swash to be safe.

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