Harken: Big Boat Use Chart

BIG BOAT USE CHART

Big Boat Chart This chart is designed to help you select the correct size hardware for each system on your boat. Match the specified dimensions on your boat to the maximum values shown in the chart.

Note: These hardware specifications assume a boat of moderate displacement sailing in normal conditions. ULDBs may often use smaller hardware. Heavy displacement boats and multihulls often require stronger hardware. Please contact Harken if you have any questions regarding the suitability of hardware for your applications.

Technical Service:
technicalservice@harken.com
262-691-3320 phone 7:30-4:30 CST

MAINSHEET	SPINNAKER - Symmetrical/Asymmetrical
RUNNING BACKSTAYS	GENOA ADJUSTABLE LEAD CAR
MASTBASE LEAD BLOCKS	GEANOA FOOTBLOCKS

Mainsheet

Maximum mainsail area

57 mm Low-load Black Magic®		57 mm High-load Black Magic®		75 mm Low-load Black Magic®/ 75 mm ESP		75 mm High-load Black Magic®/ 75 mm Stainless		100 mm Black Magic®/ 100 mm Stainless		125 mm Black Magic®		150 mm Black Magic®/ 150 mm Stainless
ft²	m²	ft²	m²	ft²	m²	ft²	m²	ft²	m²	ft²	m²	ft²	m²

End-boom Single Attachment
450	41	550	51	600	56	750	70	900	84	1250	116	1550	144

End-boom Multiple Attachment*
500	46	675	63	720	67	900	84	1100	102	1500	139	1750	163

Mid-boom Single Attachment
400	37	400	37	450	42	550	51	700	65	1000	93	1375	128

Mid-boom Multiple Attachment*
450	41	575	53	600	56	700	65	950	88	1300	121	1525	142

*Assumes two or more shackles share load on both boom and deck.

Running Backstays

Breaking strength of runner

3" Stainless steel runners		4" Stainless Black Magic®		5" Stainless Black Magic®		57 mm High-load Black Magic®		75 mm Black Magic®		100 mm Black Magic®		125 mm Black Magic®		150 mm Black Magic®
lb	kg	lb	kg	lb	kg	lb	kg	lb	kg	lb	kg	lb	kg	lb	kg

Flying Blocks
10000	4535	12500	5670	19000	8618	2500	1134	10000	4535	15000	6800	22000	10000	30000	13605

2:1 Separate Deck Blocks
12100	5490	15250	6920	23150	10500	3025	1372	12100	5490	17550	7960	26500	12020	36136	16388

2:1 Becket Deck Blocks
7500	3400	9470	4295	16500	7485	1875	850	7500	3400	10900	4945	16500	7485	22500	10204

3:1 Deck Blocks (Block #1)
14850	6735	18750	8505	28500	12928	3713	1684	14850	6735	21600	9800	32700	14835	44550	20203

3:1 Deck Blocks (Block #2)
18100	8210	22875	10375	34750	15760	4525	2052	18100	8210	26300	11930	39850	18075	54300	24625

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Mastbase Lead Blocks

57 mm Low-load Black Magic®		57 mm High-load Black Magic® & fixed MBL* blocks		75 mm Low-load Black Magic® & Mastcollar post block/ 75 mm ESP		75 mm High-load Black Magic® & fixed MBL* blocks/ 75 mm Stainless		100 mm Black Magic®/ 100 mm Stainless		125 mm Black Magic®
ft	m	ft	m	ft	m	ft	m	ft	m	ft	m

Main Halyard - Maximum "P" Dimension
47	14.3	52	15.8	60	18.3	74	22.6	80	25	90	27.5

Genoa Halyard - Maximum "I" Dimension
45	13.7	50	15.2	58	17.7	72	21.9	76	23.2	87	26.5

Spinnaker Halyard - Maximum "I" Dimension
47	14.3	53	16.1	60	18.3	74	22.6	82	25	93	28.4

*MBL = Mastbase Lead blocks
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Spinnaker - Symmetrical/Asymmetrical

Maximum mainsail area

57 mm Low-load Black Magic®		57 mm High-load Black Magic®		75 mm Low-load Black Magic®/ 75 mm ESP		75 mm High-load Black Magic®/ 75 mm Stainless		100 mm Black Magic®/ 100 mm Stainless		125 mm Black Magic®		150 mm Black Magic®/ 150 mm Stainless
ft²	m²	ft²	m²	ft²	m²	ft²	m²	ft²	m²	ft²	m²	ft²	m²

Spinnaker Sheet, Tack Line
720	67	1200	111	1400	130	2000	186	2650	246	4300	400	5600	520

Afterguy*
790	73	1320	123	1500	140	2200	204	2900	269	4700	437	6100	567

*Assumes maximum deflection of 45° to winch
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Genoa - Adjustable Lead Car

Maximum sail area

Small Boat		Midrange		Big Boat 3000		Big Boat 4500		Mini- Maxi
ft²	m²	ft²	m²	ft²	m²	ft²	m²	ft²	m²

#1 & #2 Genoa
450	41	750	70	1500	139	2700	251	4400	409	Assumes 155% Genoa /25 knots apparent wind /45° sheet lead angle

#3 Genoa
175	16	330	31	435	40	650	60	1300	121	Assumes 100% Genoa /40 knots apparent wind /60° sheet lead angle

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Single Genoa Foot Blocks

Maximum 100% foretriangle sail area at 40 knots

57 mm Low-load Black Magic®		57 mm High-load Black Magic®		75 mm High-load Black Magic®/ 75 mm Stainless		100 mm Black Magic®/ 100 mm Stainless		125 mm Black Magic®		150 mm Black Magic®/ 150 mm Stainless
ft²	m²	ft²	m²	ft²	m²	ft²	m²	ft²	m²	ft²	m²

180° Turn
110	10	180	17	365	34	540	50	800	74	1100	102

120° Turn
125	12	210	20	420	39	630	59	920	85	1256	117

90° Turn
155	14	260	24	515	48	770	72	1130	105	1540	143

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Double Genoa Foot Blocks

Maximum 100% foretriangle sail area at 40 knots*

57 mm Low-load Black Magic®		57 mm High-load Black Magic®		75 mm Black Magic®		100 mm Black Magic®		125 mm Black Magic®
ft²	m²	ft²	m²	ft²	m²	ft²	m²	ft²	m²

180° Turn
75	7	120	11	240	22	360	33	530	49

120° Turn
85	8	140	13	275	26	415	39	610	57

90° Turn
105	10	175	16	340	32	510	47	750	70

*Based on load on upper sheave
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