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Don’t just put any servo in there. Most standard servos provided with a Tx/ Rx kit are “basic” and simply won’t handle the task required there and the effort from the water on our IOM rudder. Only 1 meter long but nevertheless the pressure on the rudder is still substantial. Well worth spending few bobs on a good servo. I decided to write this article since I lost control of my TS2 in medium conditions after the U-shape connector from the rudder rod to my Futaba S9202 snap clean. I did some research since and this is my findings. Below I have listed my short list of, in my view, the best servos able to do the job on our IOM boat. Hope this will help you in deciding which is the one for you.
Note : the above data is for information purpose only based on various sources. Please let me know if you notice anything wrong but I am not responsible for the content.
The Pros
The digital micro processor is 10 times faster than an analog servo
The standing torque of a digital servo is 3 times that of its analog counterpart.
Programmable for failsafe
The cons
Higher power consumption than analog
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S9202b

S9402

S9451

HS-645MG

HS-985MG

HS6985HB
Servo
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Type
Analog
Analog
Digital
Analog
Analog
Digital
Weight
50g
55g
56g
55.2g
62g
52g
Torque @ 6.0V
7.1Kg
8Kg
8.7Kg
9.6Kg
12.4Kg
12.4 Kg
Speed (60deg)
0.21sec
0.10secs
0.11secs
0.20sec
0.13 secs
0.13sec
Current @ 6.0V Idle / Running
N/A
N/A
N/A
9.1mA / 450mA
6.6mA / 500mA
3mA / 240mA
Gears
nylon
Metal
Metal
Metal
Metal
Karbonite
Dimension
41x20x36
41x20x38
41x20x38
40.6x19.8x37.8
39.4x20x37.8
40x20x37
Avg Price
€ 70
€ 90
€ 100
€ 45
€ 60
€90
Other Info
Great entry level & reliable
A good upgrade on the 9202
Not sure if worth the price tag
Great entry level & Reliable
Huge Torque packed in a small size
Programmable and huge Torque
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