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[JamesE1]

I am currently building a tug (Brakengarth from MMM) and fitting running gear. I have got a servo (25KG High Torque Metal Geared Waterproof Digital Servo DS3225 ) with rotation 180degrees as couldn’t find any with a smaller rotation. How do I reduce the rotation for steering as I only need a rotation of around 70degrees.

[kinmel]

The easiest way is to use different radius servo arms.
Fit the servo with a short arm, this reduces the travel distance of it's tip.   Fit the rudder with a long arm which can then reduce the turn of the rudder.
With a series of holes along each arm, you can vary the link rod's position between them to find the degree of turn you need.

[Barney Magrew]

Depending on your tarnsmitter you can reduce the throw of the servo by altering the end points on that particular channel.

[dougal99]

Your rudder channel is proportional (or shoukd be) so just move the stick enough to get the turn you want. Anything over 45 startto act as a brake.

[JimG]

First off there are plenty of standard servos you could get to replace this with normal amounts of rotation. There is no need for a waterproof servo in a scale boat, this is for buggies where the servo is exposed and liable to get wet. In a tug where the servo is mounted above the bottom of the hull is it very unlikely to get wet. Probably not really needing a 25 Kg torque servo as it doesn't really take that much force to turn a boats rudder.
Check out Hitec servos, probably a bit more expensive than the one you have but good quaility, the HS-645MG is a good all rounder with plenty of torque at 7 Kg for the vast majority of models.
Jim

[Big Ada]

Use less thumb movement!

[roycv]

Hi can we just check on this please?  You can buy servos marked as 180 degrees but when in use with transmitters they only turn through 90 degrees.  They need to have a servo expander circuit inserted between the receiver and the servo to get 180 degrees.

Have you plugged into your receiver and checked it?


Roy

[JamesE1]

Thanks for all the advice. Still waiting for the servo to arrive but will test when it arrives. Next time will ask the questions and seek advice before buying.

[Joseph-D]

Asking questions is how we learn!!