Page 32 - Harken

Ordering Midrange Blocks

1. Determine block size and type
The tables below are guidelines for typical applications. Additional rigging tips are available at http://www.harken.com. P
2. Contact E I
If you have questions, please contact your dealer or Harken Technical Service. J
Note: Multihulls and heavy displacement monohulls should reduce the maximum sail areas shown by as much as 25%.

Mainsheet Mainsheet
The farther forward a mainsheet system is on Maximum mainsail area (P x E x .5 x 1.1*)
the boom, the higher the loads. Systems with ft 2 m 2
multiple attachment points spread the load over End-boom system Single attachment 500 46
the boom. Use the table to determine if Midrange Multiple attachment† 540 50
blocks are strong enough for your mainsail area. Mid-boom system Single attachment 425 39
See pages 262 - 264 for common configurations. Multiple attachment† 500 46
*Assumes 10% roach. †Assumes two or more shackles share load on both boom and deck.

Genoa Footblocks Genoa Footblocks
Determine the area of your foretriangle and Maximum 100% foretriangle sail area at 35 knots (I x J x .5)
how many degrees the footblock will deflect ft 2 m 2
the line to select footblock size. For system 180˚ turn 150 14
loading details, see the Block Loading vs. 90˚ turn 215 20
Angle of Deflection and Genoa System
Loading sections on page 279. See
page 259 for common configurations. Spinnaker
Maximum spinnaker area (P x E x .5 x 1.8)
Standard High-load
ft 2 m 2 ft 2 m 2
Spinnaker: Symmetrical/Asymmetrical Sheet Plain 1100 100 1300 120
Use the spinnaker’s sail area to determine what Ratchet 900 83 — —
size Midrange or high-load Midrange blocks to Afterguy* Mounted amidships 1100 100 1250 115
use for the sheet and afterguy controls. See Mounted on transom 900 83 1000 93
page 269 for common configurations. Maximum "I" dimension
Masthead halyard 48 14.6 53 16
*Assumes maximum deflection of 45°.

Mastbase Lead Blocks Mastbase Lead Blocks
Attach blocks to padeyes or 1634 Midrange Standard High-load
ESP stand-up bases, or mount mastbase halyard ft m ft m
leads to the deck. Use mainsail luff length and Maximum "P" dimension
foretriangle height to determine what size Main halyard lead 48 14.6 52 15.8
Midrange or high-load Midrange blocks to use. Maximum "I" dimension
Carbo blocks or 1986 mastbase halyard leads Genoa halyard lead 46 14 50 15.3
may be appropriate for applications with lower Maximum "I" dimension
loads. See page 268 for common configurations. Spinnaker halyard lead 48 14.6 53 16

Running Backstays Running Backstays
The table below shows if Midrange or high- Maximum breaking load of runner wire
load Midrange blocks are strong enough for Standard High-load
the backstay, based on the breaking strength 2:1 fl ying blocks lb kg lb kg
of the runner wire. 1:1 afterguy deck 2200 998 2800 1270
2:1 afterguy becket deck 3600 1633 3600 1633
2:1 afterguy single deck 4500 2040 5000 2268

Vang Vang
See page 265 for common configurations. Maximum mainsail area (P x E x .5 x 1.1*)
ft 2 m 2
Fiddle 400 37
Triple 450 42
*Assumes 10% roach.
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