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SELECTION GUIDE

Choose a Selden Single Line Reef boom: the BS boom range with maximum foot length and outhaul purchase, inboard-end sizes, the reefing routine and the Emax / Ymax section-choice tables for masthead and fractional rigs.

DocumentSelden Single Line Reef Selection Guide
FormatPDF · 4 pages · 0.8 MB
LanguageEnglish
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The SystemSLR BoomsReefingSection ChoiceProducts
Selden Single Line Reef — Selection Guide

How Single Line Reef Works

Ease the halyard to premarked reefing points and haul in on the reefing line: luff and leech are pulled down at the same time. Guided blocks inside the boom keep the lines from tangling, and the system has a 2:1 gear ratio, so the reef goes in without leaving the cockpit.

  • Booms B087 to B250.
  • Each BS boom in the table carries an outhaul plus 2 Single Line Reef lines, all led aft to the cockpit.

Single Line Reef Booms

Art. no. Boom section Emax (mm) Remarks
BS 087-61 B087 3410 Outhaul (2:1) + 2 Single Line Reef, aft
BS 104-61 B104 3560 Outhaul (2:1) + 2 Single Line Reef, aft
BS 104-62 B104 4060 Outhaul (2:1) + 2 Single Line Reef, aft
BS 120-62 B120 3635 Outhaul (3:1) + 2 Single Line Reef, aft
BS 120-63 B120 4135 Outhaul (3:1) + 2 Single Line Reef, aft
BS 135-62 B135 4105 Outhaul (3:1) + 2 Single Line Reef, aft
BS 135-63 B135 4605 Outhaul (3:1) + 2 Single Line Reef, aft
BS 152-62 B152 4305 Outhaul (3:1) + 2 Single Line Reef, aft
BS 152-63 B152 4605 Outhaul (3:1) + 2 Single Line Reef, aft
BS 152-64 B152 5105 Outhaul (3:1) + 2 Single Line Reef, aft
BS 152-65 B152 5605 Outhaul (3:1) + 2 Single Line Reef, aft
BS 171-61B B171 4625 Outhaul (3:1) + 2 Single Line Reef, aft
BS 171-62B B171 5125 Outhaul (3:1) + 2 Single Line Reef, aft
BS 171-63B B171 5625 Outhaul (3:1) + 2 Single Line Reef, aft
BS 171-64B B171 6225 Outhaul (3:1) + 2 Single Line Reef, aft
BS 200-61B B200 5665 Outhaul (4:1) + 2 Single Line Reef, aft
BS 200-62B B200 6765 Outhaul (4:1) + 2 Single Line Reef, aft
BS 250-61B B250 5670 Outhaul (4:1) + 2 Single Line Reef, aft
BS 250-62B B250 6170 Outhaul (4:1) + 2 Single Line Reef, aft
BS 250-63B B250 7170 Outhaul (4:1) + 2 Single Line Reef, aft
BS 250-64B B250 7670 Outhaul (4:1) + 2 Single Line Reef, aft

Aft = lines to cockpit.

Inboard end

Boom section A (mm) B (mm) C (mm)
B087 8 8 16
B104 8 8 16
B120 14 10 20
B135 14 12 20
B152 14 12 20
B171 16 12 20
B200 20 16 30
B250 18 16 30

A, ØB and C are the inboard-end dimensions marked on the B087–B250 drawing in the PDF.

How to Operate a Single Line Boom

  1. Release the Rodkicker.
  2. Slacken the mainsheet.
  3. Ease off the main halyard to the premarked reefing points.
  4. Tension the reef line up to the marked position on the line. The reef is in.
  5. Remove any slack in the other reefs.
  6. Adjust the mainsheet.
  7. Adjust the Rodkicker.

Boom Section Choice

To select the boom section you need the sail foot length (E) and the righting moment (RM at 30°). If RM is not known, displacement is an alternative. E and Y must also be known for dimensioning. Boom length is sometimes set by other factors than E (for example an over-length extrusion so the mainsheet clears a sprayhood), so the S measurement is needed as well.

  • Find your RM (kNm) or displacement (tonnes) row.
  • Read across to a section whose Emax and Ymax (m) both cover your boat; sections B087 to B300 are listed.
  • Use the masthead table for masthead rigs and the fractional table for fractional rigs.

Masthead rigs, Emax and Ymax (m)

Selden boom section choice table for masthead rigs: Emax and Ymax by righting moment and displacement, sections B087 to B300

Fractional rigs, Emax and Ymax (m)

Selden boom section choice table for fractional rigs: Emax and Ymax by righting moment and displacement, sections B087 to B300

Need a part that isn't listed? Ask us to source it and quote the part number from the PDF.

Products in this Selection Guide