Boom Brake Installation

Created: Tuesday, 11 November 2014 Written by Ed. Martin

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Components for Capt. Don Boom Brake tension line. See the video at: http://youtu.be/yCkFUGl12xw
Boom Brake attached to boom at 48” back from gooseneck using length of 1/8” AmSteel-Blue Dyneema AS-78 single braid. Attachment was made by square lashing the line around boom (main is loose footed) through top eye of boom brake and finished with a rolling hitch around lashing between Boom and Brake. Another option that is bullet proof in preventing any boom damage is to rig it to a line that extends between either end of the boom. Another option is to attach it to the center of a line that is attached to the boom in 2 places preferably spaced apart at least 1/3 as long as the boom. In other words the load is spread across 2 attach points to the boom and not a single point.

Run the tension line up through, around and back down through the Brake so the line leading to either side is between the brake loop and the vessel's deck.
 
BB Attachment

After several trials using different diameter line, the final Tension Line was determined to be New England Rope, 3/8”Sta-Set, Polyester Double Braid. Length will vary with the vessel. Attach a Ronstan, Standard 2 11/16” S-Bail Snap Shackle to the working end of the line using a Buntline Hitch, Fisherman’s Bend or Bowline. Attach point of shackle according to what is suggested in directions, our point is the Port lower after stay turnbuckle.
Snap Shackle

In order to adjust the tension of the lin,e a block and tackle was constructed that could be actuated from the cockpit. The running end of the Tension Line affixed to the swivel of a Ronstan, Series 40, All Purpose Fiddle Block. Construct the Double Tackle using New England Rope, 5/16” Sta-Set, Polyester Double Braid. (3850 Lb breaking strength) eye attached to a Ronstan, Series 40, Fiddle/Becket/Cam so control line leads back to vessel cockpit. Attach another Ronstan, 2 11/16” Standard S-Bail Snap Shackle to the Fiddle/Becket/Cam swivel. Attach this Snap Shackle according to what is suggested in directions, our point is the Starboard lower after stay turnbuckle.
 
UPDATE: A block and tackle is not always necessary. Use a block with clam cleat and extend the friction line a foot or two past the cleat. Running it back to the cockpit creates a potential tripping hazard and once the boom brake is adjusted, it rarely needs any further adjustment.
Friction Line

Parts List:
Samson, 1/8” AmSteel-Blue Dyneema AS-78, single braid (2,500 Lb Breaking Strength)
New England Rope, 3/8” Sta-Set, Polyester Double Braid (5,100 Lb breaking strength)
New England Rope, 5/16” Sta-Set, Polyester Double Braid (3,850 Lb breaking strength)
1 Ronstan, Series 40, All Purpose Fiddle Block (882 Lb breaking strength), Part # RF41500
1 Ronstan, Series 40, Fiddle/Becket/Cam (882 Lb breaking Strength), Part # RF41530
2 Ronstan, Standard 2 11/16” S-Bail Snap Shackle (1,870 Lb working load), Part # RF6110

Comments   

+1 #1 Donna Benson 2016-08-04 17:34
:-) ALL great brand names used !
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