- Servo Database
- JR Servos
- 4721
JR 4721 - Ultra-Torque Servo
Specifications
| Last Updated: |
2024-08-17 |
| Modulation: |
Analog |
| Torque: |
4.8V: 119.00 oz-in (8.57 kg-cm)
6.0V: 140.00 oz-in (10.08 kg-cm)
|
| Speed: |
4.8V: 0.22 sec/60°
6.0V: 0.19 sec/60°
|
| Weight: |
1.72 oz (48.8 g) |
| Dimensions: |
Length:1.52 in (38.6 mm)
Width:0.73 in (18.5 mm)
Height:1.32 in (33.5 mm)
|
| Motor Type: |
Coreless |
| Gear Type: |
Plastic |
| Rotation/Support: |
Dual Bearings |
| Rotational Range: |
(add) |
| Pulse Cycle: |
(add) |
| Pulse Width: |
(add) |
| Connector Type: |
JR |
| Brand: |
 |
| Product Number: |
JRPS4721 |
| Discontinued? |
Yes |
| Typical Price: |
84.99 USD |
| Compare: |
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Notes
- JR 2721 is effectively the same servo, but with metal gears.
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Reviews of JR 4721 (2)
-
Rating:
Application(s): 90 size nitro helicopter cyclic servo
Comments: I used same servo long ago in a 30 size trainer for aileron control and during the flight the servo was stuck. same problem I experience again with my 90 size nitro heli and cyclic servo stuck again. after investigation after removal the gears I found that the motor was dragging with hand spin. Previously with the trainer mentioned above same problem was occurred and after dismantling the motor found the cores were damaged and contacting with magnates. I feel this was very unpredictable failure and could cause a model to be crashed without any sign of malfunctioning.
-
Rating:
Application(s): Collective control for Raptor 60 helicopter
Comments: This servo got a workout about every weekend for a year on my Raptor 60 and I never had any complaints. Solid servo.
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