Global Auxilliary Rudder

S/V High C's with Aux RudderAll models now incorporate the “Servo Equipe”. Weight reduced, strength increased. Improved Aux and Servo rudder plan form, cord profiles and aspect ratios. Enhanced steering performance in all wind conditions.

Stainless steel construction incorporating Fleming benchmark cast components.

The auxiliary rudder / servo powered steering system is the most powerful type of this concept built today.

Reports on 2006 Transpac San-Francisco to Honolulu reports on using a auxiliary servo-rudder system.

I used the rig in all manner of conditions from 2 kts boat speed to 7 kts and 10 knots of wind to 35+. The crossing (race) to Hawaii took 21 days and I used an autopilot almost exclusively. The return to San Francisco took 22 days and I used the wind vane almost exclusively. Sea state reached 15+ ft. in the heavier wind. More beating and reaching than running. I never adjusted the slide it was at the bottom of the slide the whole time.
I’m a firm advocate of having a wind vane for offshore. Racing I’d lean towards an autopilot but for passage making I prefer the wind vane.
Overall, I like the rig and do recommend it when asked.
Bill Merrick

  • Most powerful design available
  • For boats 30 to 45 ft – 9 to 14 m
  • Excellent complement to vessels with Hydraulic Steering & No deck Control Lines.
  • Friction clutch. Adjustable power ratio. 33/44 aux rudder.
  • Servo rudder swings 165/95 , stores out of water.
  • Emergency rudder, manual override.
  • Auto pilot add on.
  • Easy 2 bolt servo system removal.
  • Sleeve connection with pivot for easy lift up when not in use.
  • 4 point hull connection spreads transom loading.

  • Why an Auxiliary Rudder?

    Advantages over a basic servo-only device :
  • The Fleming-Servo rudder’s geared design provides increased power proportional to wind, which enables systems to be built to steer vessels as large as 45 feet.
  • The slack, wear, stiffness, slop and other inefficiencies in the main steering system have no detrimental effect on the Auxiliary Rudder Steering System. It in independent of the main rudder, as opposed to a servo which is not, and therefore completely avoids these problems.
  • With no control line require to the wheel or tiller, line stretch and time lag is also eliminated completely. This is particularly important to center cockpit yachts, which require longer lines, magnifying the problem. Innefficiencies in accompanying pulleys and turning blocks are also eliminated.
  • The main rudder still does the lion’s share of the work (as it was designed for) so only small Auxiliary Rudder adjustments are required to steer the vessel in the lightest of airs.
    The Servo rudder always requires slightly more hull speed to overcome rudder inefficiency, weight, and turning inertia, as well as “control line baggage”
  • Hung well aft, the semi-balanced Auxiliary rudder, with a long lateral turning moment, produces a great power in a compact rudder profile. An area as small as 20 percent on the main power will turn the vessel when set up correctly.
  • Comments are closed.