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DS821

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Old 01-25-2007, 02:43 AM
  #1  
vr2yww
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Default DS821

Since so many menbers here mentioned about somethings wrong with ds821! I just wonder is it possible to transplant the pc board of the ds821 to other analog servoes!? thanks for your valuable inputs.
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Old 01-25-2007, 07:58 AM
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rmh
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Default RE: DS821

No-motorand board n pot are integrated.
Problems?
some stuff about arm breakage which has not been thoroughly explained .
Mine all work great.
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Old 01-25-2007, 08:17 AM
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Nickrc3
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Default RE: DS821

Problems? I'm thinking about buying a half dozen of these for my new Great Planes Gee Bee ARF. Thought I'd try the 821's over the HiTec 545's.

NICK
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Old 01-25-2007, 08:45 AM
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Edwin
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Default RE: DS821

I havent had any problems with mine. Then again, I just started using them so there isnt a lot of time on them. I like them.
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Old 01-25-2007, 10:54 AM
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Carpilot
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Default RE: DS821

My DS821's all work great. I like them, accurate, fast, and strong.
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Old 01-25-2007, 05:45 PM
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mtwister
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Default RE: DS821

I think some of the early 821's had problems, but they seem to have that fixed. They work great for me on all my planes.
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Old 01-27-2007, 09:47 PM
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Jack Skip
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Default RE: DS821

No changes on the DS821s, according to DSnyder, the JR support rep.

And we have had terrible results with the DS821s. There have been many other posts with similar problems. On ours the output shaft has sheared off clean with the top of the servo case.

Seems to be a problem with the gear material being too brital (vibration and shock break the material) and the servo arm screw being too short. But just my guess. PM me if you want details.

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Old 01-29-2007, 09:29 AM
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Nickrc3
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Default RE: DS821

Are the gears made of the same "karbonite" material used on the Hitec 635's?

Please PM me on the specific's of your failures.

Thanks,
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Old 01-29-2007, 01:50 PM
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Jimnie
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Default RE: DS821

Jack,
By any chance have your guys been using LocTite on the output screw into the plastic output?
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Old 01-29-2007, 04:57 PM
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Jack Skip
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Default RE: DS821

Not sure. I'll ask. Does that cause problems?
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Old 01-29-2007, 05:28 PM
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mtwister
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Default RE: DS821

Loc-Tite will deteriorate any type of nylon or plastic.
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Old 01-29-2007, 07:24 PM
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Jack Skip
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Default RE: DS821

Well that seems to explain it. It appears that LockTite on the screws waekened the gear materials. Locktite was used on all servo screws.

I have some big appologies to make now.

Sorry to any and everyone. My bad. My mistake. My humble appology please.

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Old 01-30-2007, 12:58 PM
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Jimnie
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Default RE: DS821

Thanks Jack,
Actually I discovered the issue with my first nitro helicopter that had screws running into plastic, it more or less ruins the plastic. CA does not have the same issue but it acts like a permanent thread loc so I would not recommend that on servos either. The plastic should provide sufficient thread locking without anything else.

Thanks for being such a straight up person with your response, I really appreciate that. I am sure JR will appreciate it as well.
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Old 06-03-2007, 09:45 PM
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goroviro
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Default RE: DS821

There was no locktite applied on screw

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Old 06-04-2007, 01:42 PM
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Default RE: DS821

Same thing I witnessed, no locktite on a 40 gp extra 300, one servo on each aileron, he got it back in one piece. The helicopter guys have been staying away from them due to the vibration warnings that have been posted by JR/Horizon about them not suitable for anything over 30 size helis (but up to 120 size planes??)
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