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Rudder Adjustment


Gudgeon Adjustment | Rudder's Blade Angle Adjustment | Adjusting Kick-Up Pressure | Blade Fixing | Shock absorber


Gudgeon adjustment for compatibility with boat transom/stern

Gudgeon
Screw
Track

Sailors can adjust the distance between the upper and lower gudgeon, thereby enabling compatibility with diverse boat transoms/sterns. The upper gudgeon slides freely along the rudder box track. Position it according to your boat's specific transom/stern dimensions and fix it in the track by screwing in the four screws supplied.


Variants of a rudder setting with holes in the gudgeons.
rudder gudgeons setting


Variants of a rudder setting with pins in the gudgeons.
rudder gudgeons setting



When installing, make sure the upper gudgeon swivels freely when the rudder is turned
rudder installing
The track of the rudder box should not be obstructed by any transom/stern fitting when the rudder is turned one way or the other.
incorrect rudder installing
rudder installing
The lower gudgeon can encounter boat transom/stern fitting/s when the rudder is turned one way or the other, without any problem.
correct rudder installing


Blade Angle Adjustment
The angle of the blade can be adjusted fore and aft by lengthening or shortening the coulisse connector. To rake the blade to fore, simply rotate the coulisse connector in an anti-clockwise direction. To rake the blade to aft, simply rotate the coulisse connector in a clockwise direction. Screwing the coulisse connector one turn anti-clockwise will rake the blade to fore by 2.1°. If the connector is rotated 8 times, the blade is raked to fore by a maximum 16.8 °. This feature is important when sailing under different weather conditions.

Nut
Coulisse
Blade
Bolt
Coulisse
Blade



Adjusting the Pressure under which the Rudder Kicks Up
You can easily adjust the rudder to kick up at various pressures with a 3-position rubber stopper (located on the inside of the rudder box).
Tiller Housing
Coulisse Connector
Rubber Stopper
See a,b,c below
Blade
Bolt & nut

To open the rudder box in order to adjust the rubber stopper, disconnect the coulisse connector from the blade by undoing the nut and removing the bolt.
Lift up the tiller housing.

Unscrew the bolt on the Lock.
Insert the rubber stopper into the position you require (see a, b, c below).
Reassemble the system (reconnect the blade to the coulisse connector and close the tiller housing).


Check to verify that the pressure required to kick up the rudder matches your requirement.


Three rubber stopper positions for 3 levels of pressure under which the rudder kicks up.
a) b) c)
Rubber stopper in uppermost position - highest pressure will be required for the rudder to kick up.
Rubber stopper in middle position - average pressure will be required for the rudder to kick up. Rubber stopper in lowermost position - the least amount of pressure required for the rudder to kick up.


Disabling the Kick-Up Feature, Fixing the Blade in its Vertical Position

Fixing of the rudder blade The Dotan's kick-up feature can be disabled by an optional lock-pin feature. The lock-pin can optionally be inserted into the rudder box's lock hole, fixing the blade in an up or down position, thereby disabling all kick-up/lowering capability.
If you use this feature, don't forget to remove the pin before putting to shore!

You can use this feature when:
  • You need a safety catch when sailing in deep water to prevent the blade from being kicked up by accident
  • You're sailing in jellyfish conditions
  • You're sailing in storm conditions
  • You're an inexperienced "first time" sailor
  • You're transporting your boat on a trailer/dolly in an up position (you don't need a rope)




Shock Absorber
Dotan's rudder system features state-of-the-art damper technology that smoothes wave impacts, amortizes overloads on the rudder and damps off all other hydrodynamic vibrations. Your Dotan rudder will never vibrate and drone when sailing at speed under dynamic loadings as so many other rudders do (especially catamaran rudders). How? A U-shaped rubber clamp grips the fore of the rudder blade in the lower gudgeon arms. A shock absorber containing a silicone pusher, built onto the rim of the blade, is connected to the coulisse, which is connected to the tiller housing.
These two technologies together firmly grip the blade, totally preventing all leeward/windward fore/aft blade movement. Enhanced by the composite material of which the rudder box is made, the two technologies enable perfect amortization. Your boat control will never have been better, especially during racing. Blade vibrations / resonance and, as a result, blade fatigue, deterioration and breakage will not occur with your Dotan rudder as it so often does with other rudders. (This technology applies to Rudder 25).

 Shock Absorber for rudder


Gudgeon Adjustment | Rudder's Blade Angle Adjustment | Adjusting Kick-Up Pressure | Blade Fixing | Shock Absorber


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