DCS5209CHV  is a good spec for high voltage rudder servo in all non DF classes, including IOM, EC12M, Marblehead, 10R, or any other large boat class that uses a standard servo size for a rudder servo. It has great torque, but is also high speed!

This is a great sail arm servo in RG65 / Micro Magic/ Victoria size classes that want to use a high voltage setup

Compare this servo to HiTec HS‑5665MH

This dual bearing, metal gear features O rings on the screw holes and case seal for good water ingress protection, however for truly waterproof performance we recommend treating this (or any servo)  with Corrosion X  !

THIS SERVO IS NOT LEGAL FOR DF CLASS RACING

FEATURES:
-- High performance digital standard high voltage servo
-- High-precision metal gears
-- High quality brush motor
-- Dual ball bearing
-- Water resistant with screw & case seals

SPECIFICATIONS:
Dead band: 3μs
Working frequency: 1520μs / 330Hz
Operating Voltage:  DC6.0~7.4 V
Operating Speed (6.0V): 0.13sec/60 degrees at no load
Operating Speed (7.4V): 0.11sec/60 degrees at no load
Stall Torque (6.0V): 9.3 kg.cm(129.19 oz/in)
Stall Torque (7.4V): 10.2 kg.cm(141.96 oz/in)
Dimensions: 40x20x38.7mm /1.57x0.79x1.52 in
Weight: 52g (1.83oz)
Connector Wire Length: JR - 300 mm (11.81in)