JR DS8411/DS8411SA Warning!

[Larry Diamond]

>From a manufacturing standpoint I would assume that JR is trying to
correlate the failures to shipments from the manufacture.

If JR can drill down to a servo date range (Born Date for the Bud fans) of
the failing servos, often they are traced back to a defective lot of
components. The problem may not be the motor, could be the application it's
used in that aggravates the defects. 6 volts Vs 4.8 volts for instance.
Possibly something in a lot of receivers is causing the servo failure.

Point being, There are way to many unknown variables to panic. It would be
interesting for Horizon Hobbies to Survey all the owners for failed servos
and ask specific questions regarding application. From Batteries to
Regulators and so on...

I'm not a JR guy and have always flown Airtronics and always will. However,
I would not want to see any -Company- get a bad reputation with out knowing
all the fact.

Why do I say this...I am a Program Manager for an Electronic Contract
Manufacturing Company. Some of my accounts are very high tech cutting edge
stuff (i.e. Pacemaker Programmers, High Speed Network Switches, latest and
greatest Hearing Aids...). I can tell you from experience that the problem
is more often where you don't look than it is the obvious.

As a kind gesture, I will extend advice to HH or JR if they wish to hear my
opinions and can contact me at home or work, free of charge and perhaps they
already have a great plan to sort it out.

Patience is a virtue.

Food for thought...

Larry Diamond
(812) 482-1633 - Home
(812) 634-4286 - Work
NSRCA 3083

----- Original Message -----
From: "Henderson,Eric" <eric.henderson at gartner.com>
To: <discussion at nsrca.org>
Sent: Thursday, September 12, 2002 8:56 AM
Subject: RE: JR DS8411/DS8411SA Warning!


Nope! the pattern servos fail too! - In my case it was an 8231.. Locked on
full up aileron.... very rough day! there was a recall last year on certain
servos. I sent all of mine in. Got then back in 5 days.

Eric.

-----Original Message-----
From: Oscar Suarez [mailto:suarez at pacific.net.ph]
Sent: Thursday, September 12, 2002 4:50 AM
To: discussion at nsrca.org
Subject: Re: JR DS8411/DS8411SA Warning!


Hmmm... there must be something on the heli's that the digital servos can't
take (even though they have so much holding power/torque) ... vibration
perhaps, but if you think about it, our YS engines gives our a/c stronger
vibrations than the helis, yet, they're holding very well.  I don't think
the problem is only w/the DS8425/DS8411s, in my own experience, I had 2
different DS8455/8417 fail on my Vigor heli early this year on 2 separate
occasions (luckily I was still hovering on both times) and a friend who had
one fail as well on the first flight on his Voyager 50.  So why do the DS
work fine in our pattern planes which subjects our servos to more
vibrations compared to those on the helis? Oscar

At 09:30 PM 9/11/02 -0400, you wrote:
>I just pulled this from the Horizon Site:
>
>Notice to Helicopter Pilots using JR 8411/8411SA Digital Servo (DS)  [ top
]
>
>As a result of our own investigations and feedback we have received from
>websites such as RC Universe and Run Ryder, Horizon and JR have dedicated
>all of our available resources to investigating reports of motor failures
in
>our 8411 digital servos when used in helicopter applications.
>
>Our findings thus far have revealed that only a small number of 8411 DS
>motors have failed. However, Horizon is taking these claims of failure very
>seriously - any failure is one too many. All additional findings will be
>immediately shared with you on this site so please check back soon for
>updates.
>
>Please know that your safety and trust is our foremost priority and will
not
>be compromised or taken for granted. We are committed to providing only the
>best products and service available in the RC industry so if you have ANY
>questions or concerns regarding your 8411/8411SA servos being used in a
>helicopter application, please do not hesitate to call our product support
>staff at (877)504-0233.
>
>________________________________________________
>
>Van Flowers
>AMA: 6216 IMAC: 2229
>IMAA: 26019 NSRCA: 2778
>www.rc-aerobatics.com
>
>
>
>
>----- Original Message -----
>From: "Ronald H. Filteau" <filteau at sk.sympatico.ca>
>To: <discussion at nsrca.org>
>Sent: Wednesday, September 11, 2002 8:40 PM
>Subject: Re: JR DS8411/DS8411SA Warning!
>
>
> > Hi Folks
> >
> > What is the web address.
> >
> >
> > Ron
> > ----- Original Message -----
> > From: "David Sweatt" <dsweatt at hotmail.com>
> > To: <discussion at nsrca.org>
> > Sent: Wednesday, September 11, 2002 8:30 AM
> > Subject: JR DS8411/DS8411SA Warning!
> >
> >
> > > I don't get on here very often, however I would like to make the
pattern
> > > community aware of some hubbub that is going on with the helicopter
guys
> > > right now. There have been quite a number of severe instances of guys
> > > crashing helicopters due to motors failing in the 8411 and 8411SA
>servos.
> > So
> > > much so that Horizon has made a official statement on their website
>about
> > > it. I personally fly these servos in both pattern ships and
helicopters
> > and
> > > have not had any issues, but I know several heli guys who have, and
> > several
> > > guys who were able to prove it to Horizon and have all of their crash
>paid
> > > for. Palomar RC field in San Diego has actually BANNED the use of
these
> > > servos in any aircraft at their field until JR/Horizon resolves the
> > problems
> > > they are having with them. And several other fields in California are
> > > following suit. Anyway food for thought, don't want to start a big JR
>vs.
> > > Futaba or whatever controversy here, I'm just passing along this
> > > information. I have several good pattern buddies that also use these
> > servos
> > > and I wouldn't feel right if their ship crashed and I had kept my
mouth
> > > shut! Thanks, David Sweatt
> > >
> > >
> > >
> > > _________________________________________________________________
> > > Chat with friends online, try MSN Messenger: http://messenger.msn.com
> > >
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> >
> >
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>
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