Spars, Rigging, and Hardware for Sailboats

Rig-Rite, Inc.
 Phone: (001) 401-739-1140 -- FAX: (001) 401-739-1149
www.RigRite.com          Ordering/Questions

Isomat Booms
Listed below are the most common Isomat Boom Sections. Original Isomat Booms are easily identifiable by their angularity (they are essentially Octagonal, and hard chined), and an integral internal flat track on the bottom for special Boom Bails. Later Isomat Booms had smooth sides and an integral internal flat track on the bottom, See: Sparcraft FB Boom Sections.

For replacement Boom Parts, determine which Boom Section you have by measuring maximum Outside Dimensions.
Click on individual Boom Sections, below, to see hardware commonly used with those Sections.
 
Note that some Booms have been produced with the Isomat AutoReef (single line) Reefing System, using specially modified Boom End castings and additional components. For details, See: Isomat AutoReef System.

See also Isomat Mast Sections and Components,
Isomat Spreader Sections and Components.
And Isovang Solid Vang and Components.

Isomat Boom Sections
Cross-Section
(typical)		 Section # Maximum Outside Dimensions
(Height x Width)

Wall Thickness

Weight (lbs./ft)

 Moments of Inertia
Ixx           Iyy
(in4)          (in4)

NB-32 Boom Section

 NB-16 2 7/8" x 3 1/2" (72mm x 90mm) .070" 1.08 1.11 1.06
NB-26 4" x 3 1/2" (100mm x 90mm) .098" 1.76 2.48 2.07
           
NB-32 5" x 4 3/8" (128mm x 110mm) .098" 2.16 7.04 3.96
NB-40 5 7/8" x 4 3/8" (150mm x 110mm) .112" 2.71 11.22 4.97
NB-55 7" x 5 1/8" (180mm x 130mm) .114" 3.72 20.42 6.97
NB-70 10 1/4" x 4 1/4" (260mm x 109mm) .138" 5.16 65.09 12.88

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