International One Metre
Irish National Class Association

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. I am not responsible for the content.
Digital
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.
But typically higher power consumption than analog hence requiring more powerful batteries

Brushless
At least FIVE TIMES longer-lasting than brushed servos.
30% faster response times.
Greater resistance to jolts and vibration.
Smoother operation.
Same power consumption as brushed digital servos.
Same compact case size as standard servos.
Exceptionally durable geartrain.
Smooth dual ball bearings and strong Samarium Cobalt magnets.
Futaba
S3003/4
Futaba
S3010
Futaba
S9202b
Futaba
S9402
Futaba
BLS451
Futaba
BLS351
Futaba
S3050
Futaba
S9452
Type
Analog
Analog
Analog
Analog
Brushless
Brushless
Digital
Digital
Weight
37g
41g
50g
55g
57g
62g
45g
51g
Torque @ 6.0V
4.1Kg
6.5Kg
7.1Kg
8Kg
10.5Kg
15.6Kg
6.5Kg
9.2Kg
Speed (60deg)
0.19 sec
0.16 sec
0.21 sec
0.10 sec
0.10 sec
0.13 sec
0.16 sec
0.11 sec
Gears
nylon
nylon
nylon
Metal
Metal
Metal
Metal
Karbonite
Dimension
41x20x36
41x20x36
41x20x36
41x20x38
41x20x38
41x20x38
41x20x38
40x20x34
Approx Price
€20
€30
€55
€ 90
€90
€130
€50
€90
Other Info
Ball bearing avail as option
A good starter
Enough torque for our IOM and good speed
Great reliable servo used in a lot of IOM
A good upgrade on the 9202
In my favourite list
Huge torque & quick enough servo
Same as its analog brother but digital
A good digital one
Rudder Servos

Analog vs Brushless vs Digital
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