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HomeRC & PowerAircraftHelicopterRadio - Servo - Gyro - Gov - Batt › G770 gyro with 8700G servo
04-21-2009 02:39 PM  9 years agoPost 1
HRCH

rrNovice

Hillsborough, NJ

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Has anyone tried this set up? I have a G770 and I want to use my 8700G. I was reading the G770 manual and it says to set the gyro mode to high when using digital servos and JR gyro servos. The JR 8700G is an analog servo. Any suggestions?

I was hoping to use this set up in either my Vibe 50, or Airskipper 50.
By the way does anyone know what the torque spec of the the 8700G servo is?

thanks,

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04-21-2009 02:50 PM  9 years agoPost 2
JRjoe

rrElite Veteran

Jonesville , IN USA #1

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Key Features
Coreless motor
Dual ball bearing
Works with PCM and DSM2 radios
Overview
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.
Specs
Size Category:Specialty
Type:Analog
Application:PCM Only Heli tail servo
Torque:49.3 oz/in @ 4.8V
Speed:.09 sec/60° @ 4.8V
Dimensions (WxLxH):.73" x 1.52" x 1.32"
Weight:2.0 oz
Bushing Or Bearing:Bearing
Bearingual
Motor Type:Coreless
Gear Type:Metal


JRjoe.....
Indoor plumbing??? No, we don't need that!!!

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04-21-2009 03:09 PM  9 years agoPost 3
Russell Bear

rrApprentice

League City, Texas USA

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Just flip the switch on the gyro to "Low". This is for the analog servos.

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04-21-2009 03:10 PM  9 years agoPost 4
HRCH

rrNovice

Hillsborough, NJ

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Thanks, this is why I like Runryder so much.

thanks,

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04-21-2009 03:25 PM  9 years agoPost 5
HRCH

rrNovice

Hillsborough, NJ

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Thanks, but you know something the G770 manual is a little confusing and it can cause someone to burn out their JR gyro servo by switching it to high. The manual on the G770 says to switch the gyro switch to high when using digital servos "and JR gyro servos". It then says to use select the switch to low mode when using analog servos. The JR 8700G servo is a gyro servo G=gyro.
Being that the 8700G servo is an older JR gyro servo, I will play it safe and switch the G770 gyro to low.

thanks,

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04-21-2009 03:36 PM  9 years agoPost 6
Russell Bear

rrApprentice

League City, Texas USA

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It will make a difference in how the gyro / servo setup works. It may be beneficial for you to contact Horizon Hobby (JR) to make sure where it should be set.

1-877-504-0233

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04-21-2009 03:47 PM  9 years agoPost 7
HRCH

rrNovice

Hillsborough, NJ

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I called Horizon, they said to use the G770 on low mode. when using it with a JR 8700G servo. He agreed that the manual of the G770 is a little confusing regarding the use of JR gyro servos. The JR 8700G servo although a gyro servo, it is still and analog servo.

thanks,

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04-21-2009 03:52 PM  9 years agoPost 8
Russell Bear

rrApprentice

League City, Texas USA

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I called Horizon, they said to use the G770 on low mode. when using it with a JR 8700G servo. He agreed that the manual of the G770 is a little confusing regarding the use of JR gyro servos. The JR 8700G servo although a gyro servo, it is still and analog servo.

thanks,
Cool.

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05-05-2009 12:37 PM  9 years agoPost 9
12 volts

rrNovice

Sunnyvale, Ca.

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You can use it on high mode. The 8700g is an analog servo; However, it is designed for a high frame rate. I looked up its specs, and its capable of a frame rate of 250 fps. Then I put my frequency counter on my 770 gyro and on the high setting the output was exactly 250 hz.
So it is the same- output vs. servo specs. Hope this helps. Also I flew a trex 500 with my 770 and a 8700g on high mode and it worked.

- Steve

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05-05-2009 12:53 PM  9 years agoPost 10
9387ASH

rrElite Veteran

UK

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The 8700 is actually a SuperServo. It was the fore runner for the Digital Servo's if my memory is correct.

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05-05-2009 01:28 PM  9 years agoPost 11
HRCH

rrNovice

Hillsborough, NJ

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I had a feeling the 8700G could be run on digital. The 8700G is indeed a super servo. If some one has tried an 8700G servo on digital mode and it was ok, it must then be ok.

What are the advantages of running a gyro on digital mode?
I did notice that my vibe 90 did not hold as well as it could after switching over to the 8700G servo. I removed the 8900G from my Vibe 90 because I wanted to use that servo with my Vibe 50. I don't need a fastest stuff on my Vibe 90 because I have no intention of flipping it. The cost of a crash would be too high.

thanks,

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05-06-2009 06:12 AM  9 years agoPost 12
12 volts

rrNovice

Sunnyvale, Ca.

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Be sure to use PCM only or 2.4 Ghz to prevent interference.

- Steve

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