- Servo Database
- JR Servos
- DS821
JR DS821 - Digital Sport High Torque Servo
Specifications
| Last Updated: |
2024-07-26 |
| Modulation: |
Digital |
| Torque: |
4.8V: 72.00 oz-in (5.18 kg-cm)
6.0V: 88.00 oz-in (6.34 kg-cm)
|
| Speed: |
4.8V: 0.19 sec/60°
6.0V: 0.15 sec/60°
|
| Weight: |
1.50 oz (42.5 g) |
| Dimensions: |
Length:1.50 in (38.1 mm)
Width:0.74 in (18.8 mm)
Height:1.47 in (37.3 mm)
|
| Motor Type: |
3-pole |
| Gear Type: |
Plastic |
| Rotation/Support: |
Single Bearing |
| Rotational Range: |
(add) |
| Pulse Cycle: |
(add) |
| Pulse Width: |
(add) |
| Connector Type: |
JR |
| Brand: |
 |
| Product Number: |
JRPS821 |
| Discontinued? |
Yes |
| Typical Price: |
29.99 USD |
| Compare: |
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Notes
- This product has been discontinued. A suitable replacement you can purchase below is the Hitec D485HW.
- Manufacturer Warning: "Do not use any form of liquid thread lock to secure the servo arm screw to the output shaft of the DS821 servo. Chemicals in these liquids react with the polycarbonate gear set causing the plastic to become brittle, fracturing the final output gear."
- Manufacturer Warning: "Not recommended for planes over 1.20-size or helicopters over .30-size. Loads and vibration in larger models may cause premature failure of the servo, resulting in damage or injury to property and persons."
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Reviews of JR DS821 (6)
-
Rating:
Application(s): Thunder Tiger Raptor 30 V2
Comments: Used as my cyclic servos, and for my collective. When rebuilding the output gear on the collective servo broke clean off. I don't know if it's user error or not.
-
Rating:
Application(s): Sig Kadet Mark II w/OS 46LA
Comments: I lost my plane on the 3rd flight , doing a Loop with a Snap Roll on Top ,, lost the Elevator 75% of the way thought the loop and it flow in to the ground .. Out put shaft of the DS821 snapped , I used NO lock Tight or any thing else on it Will never use a DS821 ever again
-
Rating:
Application(s): All around except throttle, OMP Yak
Comments: First servos I ever bought, six plus years now, sent them in a year ago and they all checked out fine. Recently bought more to replace Hitecs, my 5245 jammed and crashed my plane, no more Hitec for me.
-
Rating:
Application(s): Seagull Edge 540, OS120, throttle servo
Comments: I lost a nice Seagull edge 540 when the throttle servo
gears jamed and it pulled the battery voltage down
to 3.5v, causing the other servos to wander around
aimlessly. I wouldn't recomend this servo on anything.
I'm also switching to Hitec servos in the future.
-
Rating:
Application(s): Extra 330 68" span all EX rudder
Comments: good nice servo for the price NEVER USE THREAD LOCK it kills the gears. good sports servo not doing 3D so no need for silly fast speeds. done 50 flights with them now with no problems and still tight..
-
Rating:
Application(s): for my invention
Comments: Very good servo. Powerful and fast.
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