We should know the weight and speed of the model first to give a recommendation. But the Hitec 645 is probably the most common steering servo used by gas racers, racing boats weighing 13-17 pounds. The 645 has 133 oz-in of torque on 6 volts, but I prefer the 5645 as it has a much stronger centering force - and 26% more torque. If you have plenty of room in the boat the 755HB is a great servo with loads of power and pretty cheap. I have had trouble with cheap servos, if you need reliability Futaba or Hitec are at the top. There may be other good ones but I don't know them.
If you need steering power, be sure to run 6.0 volts with a 5-cell receiver pack, or set the BEC to 6 volts. Otherwise you are giving up 18% of the servo's power.
I have never had a 645 give up on me, but no servo likes getting wet. Spraying with CorrosionX is not enough, the servo lead hole needs to be sealed along with the output arm. Vaseline packed aroung the output gear works.
The best place I've found: http://www.servocity.com/html/hitec_servos.html
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Last edited by Fluid; 11-10-2011 at 11:51 AM.
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