b"Ordering Big Boat BlocksTattler II, 19.2 m (63'), Gaff-rigged Sandbagger, Van Dam Custom BoatsAlison LangleySpinnaker: Symmetrical/AsymmetricalUse the spinnakers sail area to determine what size Black Magic, Element, or stainless steel blocks to use for the sheet and afterguy controls. See pages 269-270 for common configurations.Maximum spinnaker area (I x J x 1.8)80 mm Element*45 mm Element* 60 mm Element* 75 mm low-load 75 mm high-load 100 mm 150 mm57 mm low-load 57 mm high-load Black Magic/ Black Magic/ Black Magic/ 125 mm Black Magic/Black Magic Black Magic 75 mm ESP 75 mm stainless 100 mm stainless Black Magic 150 mm stainlessft 2 m 2 ft 2 m 2 ft 2 m 2 ft 2 m 2 ft 2 m 2 ft 2 m 2 ft 2 m 2Spinnaker sheet, tack line 720 67 1200 111 1400 130 2000 186 2650 246 4300 400 5600 520Afterguy** 790 73 1320 123 1500 140 2200 204 2900 269 4700 437 6100 567*Element blocks are appropriate for most cruising boats. For high-performance boats, choose Black Magic blocks. **Assumes maximum deflection of 45 to winch. Genoa Footblocks Footblocks route genoa controls from the lead car to a winch. Double footblocks or snatch blocks enable faster sheet changes. Determine the area of your foretriangle and how many degrees the footblock will deflect the line to select footblock size. For system loading details, refer to the Block Loading vs Angle of Deflection and Genoa System Loading sections on page 279. See page 259 for common configurations.Single Genoa FootblocksMaximum 100% foretriangle sail area at 40 knots (I x J x .5)45 mm Element* 60 mm Element* 80 mm Element*57 mm57 mm 75 mm 100 mm 150 mmCarga moderada Carga moderada Black Magic/ Black Magic/ 125 mm Black Magic/Black Magic Black Magic 75 mm inoxidable 100 mm inoxidable Black Magic 150 mm inoxidableft 2 m 2 ft 2 m 2 ft 2 m 2 ft 2 m 2 ft 2 m 2 ft 2 m 2180 turn 110 10 180 17 365 34 540 50 800 74 1100 102120 turn 125 12 210 20 420 39 630 59 920 85 1256 11790 turn 155 14 260 24 515 48 770 72 1130 105 1540 143*Element blocks are appropriate for most cruising boats. For high-performance boats, choose Black Magic blocks. Double Genoa Footblocks Maximum 100% foretriangle sail area at 40 knots* (I x J x .5)60 mm Element**57 mm low-load 57 mm high-load 80 mm Element** 100 mm 125 mmBlack Magic Black Magic 75 mm Black Magic Black Magic Black Magicft 2 m 2 ft 2 m 2 ft 2 m 2 ft 2 m 2 ft 2 m 2180 turn 75 7 120 11 240 22 360 33 530 49 120 turn 85 8 140 13 275 26 415 39 610 5790 turn 105 10 175 16 340 32 510 47 750 70*Based on load on upper sheave. **Element blocks are appropriate for most cruising boats. For high-performance boats, choose Black Magic blocks.44"