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HomeRC & Power✈️Aircraft🚁HelicopterRadio - Servo - Gyro - Gov - Batt › Using the new JR 820G as a fast governed throttle servo?
08-05-2007 07:05 PM  13 years ago
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Climax

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Using the new JR 820G as a fast governed throttle servo?
Hi all,

Has anyone tried using the new JR 820G tail servo as a throttle servo in conjunction with a Throttle Jockey Pro? (or any other governor that supports fast digital servos)

The 820G is the updated replacement for the older 810G super servo, supposedly the 820G is a true digital servo.

Thanks!
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08-06-2007 09:23 AM  13 years ago
RotorHead486

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England

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Hey,

Never used the JR 820G but i do use the Futaba 9254 quite regularly on my machines and find it works very well, as long as it's not a specialised gyro specific servo like the Futaba 9251/9256 that come with the Futaba GY601/611 it should work fine.

Hope this helps,
RH486
One Reason For Crashing'Rogue Servo Bent on World Domination'!!
FLP Flight Team
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08-06-2007 10:14 AM  13 years ago
Climax

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The nice thing about the 820G is that it's only £30 and is almost as fast as the 9254.

I sent an e-mail to Model Avionics asking the same question to which they have just replied, apparently it will work...

The older version of this servo, the 810G (and its big brother the 8700G), have a compatibility issue with Futaba gyros. They work fine once initialized, but during their initialization they would briefly crank hard over to their end point, temporarily binding linkages etc. The new replacement for the 8700, the 8900 is now OK in this respect. I don’t yet know if the same is true for the 820? I assume that the 8900 and the 820 are now “modern” digital servos as opposed to the hybrid super servo design of the former versions.

Anyway, I was concerned that if the 820 still behaved like the 810, then it may have suffered from the initialization issue when used with a TJ Pro or other governor. Apparently not, so I’ll get one and try it out...
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03-29-2008 09:37 AM  12 years ago
Stolla

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Port elizabeth South Africa

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820 on gov
I've just added a 820g to my multigov, will let you know the result
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03-29-2008 10:49 AM  12 years ago
DS 8717

rrProfessor

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JR servo's ending with a G are not digital servo's,they are super servo's. They are high frame rate servo's,but not digital.I use a 810G with an RL 10 governor with no problems.YOU ONLY LIVE ONCE..IF YOU LIVE IT RIGHT THATS ALL YOU NEED
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03-29-2008 02:22 PM  12 years ago
Climax

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I think in the case of the 820G and 8900G they are now conventional digital servos.

It was certainly the case that the older 810G and 8700G were "super servos", a JR precursor to digital.
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03-31-2008 03:44 PM  12 years ago
DS 8717

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After looking at horizon,the 8900 is a digital servo and is listed as a DS8900G,the 3500 is also a digital and is listed as a DS3500G.YOU ONLY LIVE ONCE..IF YOU LIVE IT RIGHT THATS ALL YOU NEED
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04-01-2008 01:17 PM  12 years ago
Xircom

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Kuala Lumpur - Malaysia

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I wonder if a very fast servo really makes that much difference, I heard because the engine has some lag as well as you operate the throttle already in a small range (compared to the pitch for example), many say a normal servo (e.g. 20-25ms) is enough, less that that is waste ... what is your experience ?*** fly more ***
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04-01-2008 01:28 PM  12 years ago
Climax

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West London, United Kingdom

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You're probably right, I can't say that I've noticed a great deal of difference...
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04-01-2008 01:53 PM  12 years ago
DS 8717

rrProfessor

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a fast servo doesn't help,the throttle doesnt have to move very far most of the time.A .15 is plenty fast.YOU ONLY LIVE ONCE..IF YOU LIVE IT RIGHT THATS ALL YOU NEED
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