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Old 03-01-2017, 06:32 AM
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Matt, do you know the torque specs for the NXB 8921 at 8.4 volts? or where I can find this info


thanks


Cam
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Old 03-01-2017, 06:47 AM
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Happy contrails
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Quote:
Originally Posted by orthobird View Post
Matt, do you know the torque specs for the NXB 8921 at 8.4 volts? or where I can find this info


thanks


Cam
To my knowledge they only publish specs to 7.4V, Matt may have more info than me.
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Old 03-01-2017, 06:51 AM
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I hammer at 1500 feet
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Quote:
Originally Posted by jwilliams View Post
To my knowledge they only publish specs to 7.4V, Matt may have more info than me.
thank you!
Yes, I read this:

Torque: 363 (4.8V)/456 (6.0V)/562 (7.4V)
Speed: 0.19 (4.8V)/0.14 (6.0V)/0.13 (7.4V)
Dimensions (L/W/H): 1.55x0.82x1.59 in
Weight: 2.96 oz
Input Voltage: 4.8-8.5v
MPU: 32 Bit
Shaft Support: Dual Ball Bearing
Comparable to DS8911HV and NX8921

and what I am looking at in particular is this:

Input Voltage: 4.8-8.5v


the 8.5 is what I am most interested in, and I will tell you why:


I am running a power system for the airplane, using 3S lipos, and down regulated to 8.2 volts.

I can adjust it to even 8.5 volts.

But, just for safety reasons, I have it set at 8.2 volts. SO i was interested to know what the torque is at 8.5 volts.
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Old 03-02-2017, 10:50 AM
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Quote:
Originally Posted by orthobird View Post
thank you!
Yes, I read this:

Torque: 363 (4.8V)/456 (6.0V)/562 (7.4V)
Speed: 0.19 (4.8V)/0.14 (6.0V)/0.13 (7.4V)
Dimensions (L/W/H): 1.55x0.82x1.59 in
Weight: 2.96 oz
Input Voltage: 4.8-8.5v
MPU: 32 Bit
Shaft Support: Dual Ball Bearing
Comparable to DS8911HV and NX8921

and what I am looking at in particular is this:

Input Voltage: 4.8-8.5v


the 8.5 is what I am most interested in, and I will tell you why:


I am running a power system for the airplane, using 3S lipos, and down regulated to 8.2 volts.

I can adjust it to even 8.5 volts.

But, just for safety reasons, I have it set at 8.2 volts. SO i was interested to know what the torque is at 8.5 volts.

We don't have it published anywhere because they aren't meant to run at 8.5v... but if you're going to properly setup your regulators, you need to set them by setting the voltage at the longest lead and verifying that it's not too high with the shortest. I would not put 8.5v consistently into the servos... I think that's the MAX operating voltage... stick with the 8.2v at the lead.
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Old 06-25-2017, 02:56 PM
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I hammer at 1500 feet
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ok, anyone have any performance info on this servo?

I have them in a Carden, 40%, with a 200 cc motor, with over 30 flights on them, all performing ADVANCED IMAC sequence. over 6 hours of operation, and 3 contests. They have been working flawless.


Anyone else have positive or negative experience. My flight time is quite low on them, as I do not get to practice as much as I wish I could.
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Old 06-25-2017, 03:04 PM
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I've got them installed in jets and my 3D players. Great servo with resolution, centering and power we've come to expect from JR servos
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Old 06-25-2017, 03:15 PM
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I hammer at 1500 feet
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Quote:
Originally Posted by gmilo View Post
I've got them installed in jets and my 3D players. Great servo with resolution, centering and power we've come to expect from JR servos

How many flights would you say you have on a single aircraft?
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Old 06-25-2017, 03:44 PM
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Maybe someone knows,,, where instructions or information about HOLDING, DUMPING, DEAD BAND, BOOST, ALARM LEVEL, ALARM DELAY, ANGLE, SLOW START and STOP MODE,,, for use with XBUS / NXB 8921's

Had a couple of NXB8921's die on me recently.
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Old 06-25-2017, 04:18 PM
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Quote:
Originally Posted by Bill Vargas View Post
Maybe someone knows,,, where instructions or information about HOLDING, DUMPING, DEAD BAND, BOOST, ALARM LEVEL, ALARM DELAY, ANGLE, SLOW START and STOP MODE,,, for use with XBUS / NXB 8921's

Had a couple of NXB8921's die on me recently.
Hi there Bill.... I've had the NX8921 servos (NOT the NXB) on my ailerons and also my rudder on the Dalton ML 300. I've had 244 flights on them and all are intact. I'm not sure why yours went kaput....

Here is a copy of the instructions to program the servos from the transmitter. These instructions are for the NX servos. I am checking with Matt to see if these are also used on the NXB servos. I'll post back regarding the outcome.
Wayne
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Last edited by wmat7039; 06-25-2017 at 08:45 PM. Reason: Checking on NXB vs NX instructions.
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Old 06-25-2017, 06:17 PM
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i have 5 in my viperjet that seem very smooth while working with them on setup. you can really "feel the difference" i'm close to a madian flight next week i hope.
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Old 06-26-2017, 07:50 AM
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Hey Bill. I got confirmation that the instructions above will work for the NXB servos.
Wayne
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Old 06-26-2017, 06:13 PM
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Quote:
Originally Posted by orthobird View Post
How many flights would you say you have on a single aircraft?
About 100 flights on my 3D GS airplanes. So far, gear trains remain tight. Replaced 8911HV's that did develop slop after 175 flights.

The centering precision and resolution is what's key for my preferances. I have a PNP jet that came with OEM servos from a well known, but not disclosed supplier and I can feel the difference in resolution and centering, so replaced them with NX8921's.
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Old 06-26-2017, 07:01 PM
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I hammer at 1500 feet
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I agree with you. This is by far my favorite servo, but I do not have the number of flights like you all
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Old 06-26-2017, 07:52 PM
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Quote:
Originally Posted by wmat7039 View Post
Hey Bill. I got confirmation that the instructions above will work for the NXB servos.
Wayne
Yup,,, thanks Wayne


BV
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Old 06-26-2017, 09:28 PM
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I have been trying to order these servos, I have been contacting a distributor in Japan but no response, I will order about 100 of these like I did with my 8911HV purchase 3 years ago. Then they can be out of stock and I could care less.

The 8911HV came out to $73.00/each when the yen was 130/1 usd. They usually last 400-600 flights on jets before needing new gears and case bushing, the pot still remains solid.
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