Rowing rigging

Gearing

Concept: The gearing is the calculated ratio between the effective outboard handle and the effective inboard handle. The gearing is a measure of the heaviness experienced by the rower while rowing. To make the stroke lighter, lower the gearing. 
Sizes: Dimensionless number 1.9 – 2.3 (lower = lighter)
Effect:
+ outboard handle/inboard handle ratio increases, oar becomes heavier, lever speed decreases.
outboard handle/inboard handle ratio smaller, oar becomes lighter, lever speed becomes higher.
Measure: Is not measured but calculated by dividing the Effective outboard handle by the Effective inboard handle. The Effective inboard handle is the distance in centimeters from the center of the oarlock pin to the point of application of the hand force on the handle. In sculling this is the point of application of the hand force on the handle, in sweep rowing the point between the two hands. The effective outboard handle is the distance in centimeters from the center of the oarlock pin to the point of application of the force on the blade. Calculator: Calculate oar offset.

   Effective inboard handle Effective outboard handle
 Sculling Inboard handle + 2cm  – 6cm Outboard handle – 2cm – 20cm
Sweep rowing Inboard handle + 2cm – 15cm Outboard handle – 2cm – 25cm

Adjust: There are four options for changing the gearing: 
1.  place an (orange) clam, with a clam the inboard handle longer and the gearing therefore lower;
2. adjust the collar and make the : Inboard handle longer or shorter;
3. extend the oar (inboard handle) and make the gearing lower (see also: Oar length);
4. extend the oar (inboard handle), move the collar and leave the gearing as it is.


The four possibilities to change the gearing.

Clams


Inboard handle
Span (sculling)

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