JR 8700G and Futaba Gyros don't work
Gary Quiring
tail servo is a JR 8700G.
When powering on the flight pack (TX is on first), the servo goes 90
degrees clockwise and then returns to normal. I then tried my GY501
and it also does the same thing with a 8700G.
What's gives?
Gary Quiring
Gary Quiring
>you are using PCM, right?
Yes, S-PCM using 10X.
The servo moves with the gyro just fine, it's the initial 90 degree
swing when you turn on the flight pack, obviously that movement is
going to jam/break something.
Gary Q
John E. Contreras
Futaba receiver in FM. It works great! I don't understand what that sticker
on the 8700 box that says "PCM ONLY" means. And YES, the gyro is in the "super
servo" mode.
BScott7361 wrote:
> The 8700 was made for the 5000 gyro says curtis youngblood ,he has tried it
> with futaba and said they are not compatable.
BScott7361
Kevin Hannigan
seconds.
I have the same setup (GY240 and 8700G) on a Freya and it is superb.
"Gary Quiring" <gqui...@netlabs.net> wrote in message
news:a844vsg88sr57bf4k...@4ax.com...
Kevin Hannigan
Again,- the combo works really well on my Freya.
"Kevin Hannigan" <KH...@MCIWorld.com> wrote in message
news:AjtI5.361$Xw....@pm01news.wcom.com...
Kevin Hannigan
might be caused by the high frequency noise generated by the servo.
There is a higher likelihood that this noise will cause glitching in PPM
mode rather that PCM. The previous model JR 2700 and the initial run of
8700(to the best of my knowledge) did not carry this warning. I believe this
warning results from hard practical experience.
"John E. Contreras" <jho...@postalzone.com> wrote in message
news:39F26D6A...@postalzone.com...
> Uh...............I use the 8700G servo with a CSM 540 gyro connected to a
> Futaba receiver in FM. It works great! I don't understand what that
sticker
> on the 8700 box that says "PCM ONLY" means. And YES, the gyro is in the
"super
> servo" mode.
>
> BScott7361 wrote:
>
SIMPHL
Gary Quiring
wrote:
>Ignore what happens as the gyro initiates. In fact, take walk for those 3
>seconds.
>
How do you ignore a 90 degree swing!!!!!!!!!!!!!!!!!!!! What do think
that does to the tail linkage? It's not make out of rubber!!!!
Gary Q
Andi Gysi
> When powering on the flight pack (TX is on first), the servo goes 90
> degrees clockwise and then returns to normal. I then tried my GY501
> and it also does the same thing with a 8700G.
If you can read German, you'll find a circuit here which might help you.
It was designed for using a 8700 together with the GY501.
Click on "Pulszeitlimiter"
Please note that I haven't tried this, so use it at your own risk.
However I'm sure it's better than destroying your tail linkage...
Andi
Nick M.V.Salmon
> How do you ignore a 90 degree swing!!!!!!!!!!!!!!!!!!!! What do think
> that does to the tail linkage? It's not make out of rubber!!!!
Reduce the servo arm size until it doesn't jam against the end stop with the
90Deg. swing..? <LOL>
Nick...
Doucoursey
if you limit the travel??? the only way it could damage anything is if it over
drives the travel. just disconnect the linkage and see if this happens. DOUG
Ryan
using some JR Digital Servos with a GY501, GV1 Governor, he had the whole
setup , and he kept burning them up, the servos that is. We found it was
due to the initial 90 degree movement when he turned it on. We ended up
having to call JR to see what was going on, and they basically told us what
has already been stated. The servo was not designed for use in such
systems, and officially is not compatible. Basically it will always have
that 90 degree jump, which is not a good thing, especially for this guy who
was burning up servos. If you want to use that setup, you will either have
to ignore the jump, or maybe find some third party hardware that would
intercept this. One of the people who replied to your thread seemed to have
an idea of something that would work.
Sincerely,
Ryan
Product Support
Great Planes Model Distributors
www.realflight.com
"Gary Quiring" <gqui...@netlabs.net> wrote in message
news:a844vsg88sr57bf4k...@4ax.com...
> I just got a new Futaba 240 gyro and decided to try in my Raptor. The
> tail servo is a JR 8700G.
>
> When powering on the flight pack (TX is on first), the servo goes 90
> degrees clockwise and then returns to normal. I then tried my GY501
> and it also does the same thing with a 8700G.
>
Fritz Blackburn
drives the 8700 digital servo past any set ATV point and hard against the internal
physical limits. This will give a surge of 1.5 to 2 amps and may damage the
geartrain of the 8700. So even disconnecting the linkage may not prevent damage
to the servo itself. Do ask me what kind of signal comes out or why the Futaba
servos don't do this.
Fritz
matt
expensive gyros out there (as well as in the worst/cheapest). I'm curious if
there's a correlation between sensor type and price or is performance and
quality merely a function of manufacturing and electronics surrounding the
sensor . I've found a number of inexpensive sensors from Murata , Tokin and
others used for camcorder image stabilization and vehicle GPS navigation
systems and was wondering if they're the same types as in the heli gyros.
John E. Contreras
Don Yoo wrote:
I think you are going wrong way.8700 servo works with 5000T gyro only.
I don't understand why you want to mix JR and Futaba.Don
Gary Quiring <gqui...@netlabs.net>ÀÌ(°¡) ¾Æ·¡ ¸Þ½ÃÁö¸¦
news:ba47vsgo6sig19inc...@4ax.com¿¡ °Ô½ÃÇÏ¿´½À´Ï´Ù.
> On 22 Oct 2000 18:47:59 GMT, douco...@aol.com (Doucoursey) wrote:
>
> >the GY501 has end point adjustment for the travel, how could it hurt
anything
> >if you limit the travel??? the only way it could damage anything is if it
over
> >drives the travel. just disconnect the linkage and see if this happens.
DOUG
>
> The travel adjust is useless during the powerup, the servo does a 90
> degree turn regardless of the travel adjust.
>
> Gary Q
>
Gary Quiring
Don Yoo
I don't understand why you want to mix JR and Futaba.
Don
Gary Quiring <gqui...@netlabs.net>이(가) 아래 메시지를
news:ba47vsgo6sig19inc...@4ax.com에 게시하였습니다.
Doucoursey
I think you are going wrong way.8700 servo works with 5000T gyro only.
I don't understand why you want to mix JR and Futaba.
Don>>
i think thats because futaba doesn't make a servo as good as the 8700 yet and
people are wanting the best and fastest servo.
Don Yoo
John E. Contreras <jho...@postalzone.com>ÀÌ(°¡) ¾Æ·¡ ¸Þ½ÃÁö¸¦ news:39F3BE69...@postalzone.com¿¡ °Ô½ÃÇÏ¿´½À´Ï´Ù.
Sorry, You're wrong! The 8700G servo works just fine with the CSM 540 gyro
Don Yoo wrote:
I think you are going wrong way.8700 servo works with 5000T gyro only.
I don't understand why you want to mix JR and Futaba.
Don
Gary Quiring <gqui...@netlabs.net>ÀÌ(°¡) ¾Æ·¡ ¸Þ½ÃÁö¸¦
news:ba47vsgo6sig19inc...@4ax.com¿¡ °Ô½ÃÇÏ¿´½À´Ï´Ù.
Ken Bryant
Why mix? Well every manufacture out there makes several servos, each
servo has its use. When some one wants the best they pay for it. I
know of many pilots that have servos from 3 brands in their
Helicopters. Then a gyro from another. All work well together. Price,
features and functionality go in to there descisions. Not everyone is
hung up on one brand for everything. Not suggesting you are just
thought I'd say it.
Like other pilots I plan to own more than 1 heli. I will mix
components to get the best performance for the dollar. Once I move
into the 2 or more heli hanger I'm sure parts will get swapped around.
Radio gear is the most common item to move around. That's why people
mix!
To quote the JR/Horizon web site,
"8700G High Speed Super S (PCM Only)
The ultimate tail rotor servo. The 8700G offers a speed of .09 second
transit at 4.8 volts. Wider spaced bearings offer superior wear
characteristics and precision. The 8700's unsurpassed precision and
speed are essential for accurate tail control when used with
heading-lock style gyros. With the 8700G, heli enthusiasts will find
their tail more precise and longer lasting than ever. "
NO WHERE does it say works with the 5000T gyro only!
The fact is that the 5000T Gyro is made to uses the 8700, but it's not
limited to it. It can also use a 8417 servo.
It would be fool hardy for a manufacture to make a $150 servo for only
one application.
Ken Bryant
On Mon, 23 Oct 2000 02:21:30 GMT, "Don Yoo" <dy...@bellatlantic.net>
wrote:
Dennis Groves
applications and the GV-1 governor and never a problem w/ Futaba (9ZWC II),
but not w/ GY501.
But, I can't bight off on the 8700g for $150, since for $50 more I picked up
the new high frame rate GY401 w/9253 digital servo (.08 transit time @4.8
and plastic, no slop,cheap to replace gears, but perhaps low torque for a
60,only time will tell ). What a gyro combo!!!
"Ryan" <rfsu...@greatplanes.com> wrote in message
news:sAII5.42117$Ou2.1...@news-east.usenetserver.com...
Gary Quiring
wrote:
>That's different, as I also have been using the JR digital servo's on other
>applications and the GV-1 governor and never a problem w/ Futaba (9ZWC II),
>but not w/ GY501.
>
>But, I can't bight off on the 8700g for $150, since for $50 more I picked up
>the new high frame rate GY401 w/9253 digital servo (.08 transit time @4.8
>and plastic, no slop,cheap to replace gears, but perhaps low torque for a
>60,only time will tell ). What a gyro combo!!!
>
You can buy 8700G's for $109 at CyberHeli.com.
Bill Shepard
http://www.ronlund.com/Merchant2/merchant.mv?Screen=PROD&Store_Code=heli&Pro
duct_Code=JRPS8700G&Category_Code=Servos
It contains this:
"This servo is not compatible with the Futaba GY501 gyro. This information
was brought to us in early March and verified by a very well known JR Pilot
and his dad, who is probably the authority on gyros."
Bill
"Gary Quiring" <gqui...@netlabs.net> wrote in message
news:ba47vsgo6sig19inc...@4ax.com...
the_ewings
gyros. However: the 500T is optimized to use only the 8700G for best
performance.
Jeff
John & Michelle
AFAIK the piezo sensors used in heli gyros are the ones used for
camcorder stabilisation. I suspect that the price difference can be
attributed to the sophistication of the support electronics and
software. Probably the latter more than the former...
JM
Gary Quiring
Well it does not work with a Futaba GY501 or 420 gyro. I have tried
both. It has also been confirmed on several web pages that the servo
does work with several other gyros either.
It's pretty damm stupid for JR's top of the line servo to not be
compatible, considering there lower end servos are.
Gary Quiring
Nick Mueller
> inexpensive sensors from Murata , Tokin and
> others used
Ikarus uses TOKIN. I think, that most effort goes into software
development. The electronics outside of the sensor itself are damned
simple. Just look at the specs of the sensors at Tokin and you see that
you only need a differential op-amp and a uC with A/D input.
Nick
--
... at least I'm one of them!
J.W.Moore
Steven655
Steve
Ken Bryant
there radio configuration is. Compare that tho those that are not.
RX
All other servos
Gyro:
Maybe something in common here?
Ken Bryant
On 30 Oct 2000 02:05:39 GMT, stev...@aol.com (Steven655) wrote:
>I use a gy501 with the 8700 with no problems at all.
>Steve
Ken Bryant
http://members.tripod.com/volkul/
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