Dutchman Boom Brake Installation and Use – Mainsheet May 2005

Dutchman Boom Brake Installation and Use
Kevin Murray
Mainsheet Date: 5/1/2005
Hull #: 88

The Dutchman Boom Brake is designed to control the speed of the boom as it crosses the boat during jibing. This can be a dangerous situation in moderate or higher winds. It also makes a great preventer for use when running downwind. As shown in Figure 1, this brake consists of three sheaves mounted between two plates in a triangular configuration; a line wraps around these in a serpentine fashion. The two upper sheaves are fixed and do not rotate; the lower sheave either rotates or is fixed depending on the setting of the control knob on the front of the device.

When the line running through the brake is tensioned, it grips the line with greater tension yielding more grip. By adjusting the knob and/or tension, more or less braking friction is in winds below

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