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HUTTON BoomBrake Fitting Instructions

 Refer to diagram 1.
a) Determine the two strongest points to anchor the fastenings for the BoomBrake Control Line (A & C).
The aft most chain plate is ideal, but a well affixed metal toe rail can be used. However, it is well to remember that considerable forces can be generated at the point of attachment.
If in doubt as to the strength or suitability of any selected fitting method, seek professional advice.
In some cases, for example where the point of attachment is through a deck or cabin top, it is wise to fit a reinforcing plate behind the point of attachment in order to spread the load.
Chain plates can be drilled to allow for the fitting of a sturdy shackle.

b) Select (A or C) the point to which you will tie off your BoomBrake Control Line.
On the opposite of the vessel, affix (by a shackle) a swivel metal sheathed turning block to the attachment point (A or C)

Refer to diagram 2.
Positioning the BoomBrake at the right position on the boom is important.
 Mark a point on your boom which is directly above the attachment point (A or C). Measure from this point 150mm (5-7/8") aft along the boom and mark this point as teh point of attachment on the boom for your BoomBrake (B).

c) The BoomBrake is affixed to the underside of the boom (B).
Use a sturdy attachment such as is used for attaching a conventional boom vang or for a mainsheet attachment.
Again, remember that the load on this attachment point can be considerable.

d) Affix the BoomBrake attachment fitting to the boom (B).
By using a swivel, affix the BoomBrake unit to the boom fitting (B).

Fitting the HUTTON BoomBrake Control Line

e) The Control Line should be a pre-stretched 'Dacron' type rope. The rope size will depend on the BoomBrake model and size of the sail you wish to control:
Model M100: Rope size 6mm to 10mm [1/4" to 3/8"]
Model M125: Rope size 8mm to 13mm [5/16" to 1/2"]
Model M150: Rope size 10mm to 15mm [3/8" to 9/16"]

f) Affix one end of the BoomBrake Control Line to your chosen attachment point (A or C).
Ensure that the rope will not chafe.

g) Lead your Control Line from the fixed point (A or C) up and through the guide hole in the end of the guide arm.
Feed the line around the helical drum so the the line lies in the machined groove.
Continue to feed the line back down through the other guide hole in the opposite guide arm.
The line then continues to the turning block and is fed through this block.

From here it is usual to lead the Control Line aft to the cockpit, or some other area, from where it is easy to control the BoomBrake Control Line, using a small winch or purchase block system.

Note: On racing yachts and larger vessels using the Model M150, it may be desirable to run the Control Line aft to the cockpit on both sides of the boat, so that the Control Line can be tensioned from either side of the BoomBrake helix.

h) Once your BoomBrake is installed, check all fixings and attachment points to see that the Control Line is secure at the originating point and that it can run freely trough the blocks etc, back to the cockpit.

Now you are ready to sail with your HUTTON BoomBrake - fair winds!