Dimensions of Irwin 3/4 t

Updated 10/25/2012

Selected Measurements for Irwin 3/4 t

BOAT	I	J	P	E	ISP	JSP	PY	EY	Disp	LWL	DRAFT
Irwin 3/4 t	43.8	14	37.1	12	0	0	0	0	10000	27.58	4.5

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Other Data Base Entries for irwin 3*

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BOAT	I	J	P	E	ISP	SPL	PY	PE	LWL	DRAFT	DISP
Irwin 3/4 T	43.8	14	37.1	12					27.58	4.5	10000
IRWIN 3/4 T	43.8	14	37.1	12			7.3		28.25	4.5	9715
IRWIN 3/4 TON	43.8	14	37.1	12	43.8	14
IRWIN 3/4 TON FK	43.8	14	37.1	12	43.8	14
IRWIN 30	41.68	13.5	35	11					26.92	5	9200
IRWIN 30	41.7	13.5	35	11
Irwin 30	41.7	13.5	35	11					26.4	5.4	10000
IRWIN 30	41.7	13.5	35	11	41.7	13.5
IRWIN 30 (1/2 TON FK)	39	12	33.2	9.5
Irwin 30 Cb	41.7	13.5	35	11					26.4	4.3	10000
IRWIN 30 CB	41.7	13.5	35	11					26.92	8.3	9200
IRWIN 30 CITATION	42	13	37	12
IRWIN 30 CITATION	42	13	37	12					26.92	5.3	10400
Irwin 30 Citation	42	13	37	12					26.92	5.3	10400
IRWIN 30 CITATION	42	13	37	12	42	13
Irwin 30 Citation Cb	42	13	37	12					26.92	4	10600
IRWIN 30 CITATION CB	42	13	37	12					26.92	8	10600
IRWIN 30 CITATION CB	42	13	37	12	42	13
IRWIN 30 CITATION DK	42	13	37	12					26.92	5.33	10600
Irwin 30 Citation Sd	42	13	37	12					26.92	4	10600
IRWIN 30 CITATION SD	42	13	37	12	42	13
IRWIN 30 COMP	41.7	13.5	35	11
Irwin 30 Comp	41.7	13.5	35	11					26.92	5.3	10000
Irwin 30 Comp Cb	41.7	13.5	35	11					26.92	4
Irwin 30 Comp Sd	41.7	13.5	35	11					26.92	3.9	10000
IRWIN 30 COMPETITION	41.7	13.5	35	11					26.92	5.33	10000
IRWIN 30 COMPETITION	41.7	13.5	35	11	41.7	13.5
IRWIN 30 COMPETITION CB	41.7	13.5	35	11	41.7	13.5
IRWIN 30 COMPETITION SD	41.7	13.5	35	11					26.92	3.9	10000
IRWIN 30 COMPETITION SD	41.7	13.5	35	11	41.7	13.5
IRWIN 30 SD	41.7	13.5	35	11					26.92	3.9	10500
Irwin 30 Sd	41.7	13.5	35	11					26.92	3.9	10500
IRWIN 30 SD	41.7	13.5	35	11	41.7	13.5
IRWIN 31	37	12.1	32	14
Irwin 31	37	12.1	32	14					22.5	3.3	9600
IRWIN 31	37	12.1	32	14			7.1		22.25	7	9600
IRWIN 31	37	12.1	32	14	37	12.1
Irwin 31 Citation	42	12	37	12					28.25	6	9300
IRWIN 31 CITATION	42	12	37	12					28.25	6	9300
IRWIN 31 CITATION	42	12	37	12	42	12
IRWIN 31 CITATION	42	13	37	12
IRWIN 31 CITATION CB	42	12	37	12	42	12
IRWIN 31 CITATION SD	42	12	37	12					28.25	4	9700
Irwin 31 Citation Sd	42	12	37	12					28.25	4	9700
IRWIN 31 CITATION SD	42	12	37	12	42	12
Irwin 31 Sd Tm	39.9	12.1	34	14					22.5	4
IRWIN 31 Tall rig	39	12.1	34	14
Irwin 31 Tm	39	12.1	34	14					22.5	3.3	9600
IRWIN 31 TM	39	12.1	34	14			7.1		22.5	7	9600
IRWIN 31 TM	39	12.1	34	14	39	12.1
IRWIN 32	39.5	13	34.5	14
Irwin 32	39.5	13	34.5	14					25	5	11300
IRWIN 32	39.5	13	34.5	14					25	7.83	11500
IRWIN 32	39.5	13	34.5	14	39.5	13
Irwin 32 Cb	39.5	13	34.5	14					25	3.5
IRWIN 32 CB	39.5	13	34.5	14	39.5	13
IRWIN 32 CB	40.3	12.9	34.9	13.9
IRWIN 32 CITATION	43	13.2	37.5	12.5
IRWIN 32 CITATION	43	13.2	37.5	12.5					26.75	6	10500
Irwin 32 Citation	43	13.2	37.5	12.5					26.75	6	10500
IRWIN 32 CITATION	43	13.2	37.5	12.5	43	13.2
Irwin 32 Citation Sd	43	13.2	37.5	12.5					26.75	4	10500
IRWIN 32 CITATION SD	43	13.2	37.5	12.5					26.75	4	10500
IRWIN 32 CITATION SD	43	13.2	37.5	12.5	43	13.2
Irwin 32.5	39	13	32	13					26	3.83	13000
IRWIN 32.5	39	13	32	13					26	3.92	13000
IRWIN 32.5 KETCH	39	13	32	11.75			18.5		26	3.92	13000
IRWIN 32.5 KETCH	39	13	32	11.8	39	13	18.5	7.3
IRWIN 32.5 KETCH	39	13	32	13			18.5	7.3
IRWIN 32.5ITA	39	13	32	13	39	13
IRWIN 33	44	14	37.5	11					27.5	5.5	10950
IRWIN 33 COMP	42	14	35.5	11
IRWIN 33 Mk 1	44	14	35.5	11
IRWIN 33 Mk 2	42	14	37.5	11
IRWIN 33 MKII	42	14	35.5	11					27.5	5.5	11950
IRWIN 33 MKII CB	42	14	35.5	11			8		27.5	8	12550
IRWIN 33 MKII SD	42	14	35.5	11					27.5	3.92	11950
IRWIN 33 SD	44	14	37.5	11					27.5	3.92	11800
Irwin 33-1	44	14	37.5	11					27.5	5.5	11500
IRWIN 33-1 CB	44	14	37.5	11	44	14
IRWIN 33-1 KE	44	14	37.5	11	44	14
Irwin 33-1 Sd	44	14	37.5	11					27.5	3.9	11800
IRWIN 33-1 SD	44	14	37.5	11	44	14
Irwin 33-2	42	14	35.5	11					27.5	5.5	11950
Irwin 33-2 Cb	42	14	35.5	11					27.5	4	12550
IRWIN 33-2 CB	42	14	35.5	11	42	14
Irwin 33-2 Sd	42	14	35.5	11					27.5	3.92	12550
IRWIN 33-2 SD	42	14	35.5	11	42	14
IRWIN 33-2 SD	42	14	35.5	11	42	14
Irwin 33-3 Sd	42	14	35.5	11					27.5	4	12550
IRWIN 33.9 (3/4 Ton)	42	13.3	37	10.5
IRWIN 33.9 (3/4 Ton)	43.8	14	37.1	12
IRWIN 34	42.75	13.75	37	13.5					27.33	5.33	11500
IRWIN 34 (104)	35	12	30.2	12.3
IRWIN 34 (3/4Ton)	43.5	14	36.8	10.8
IRWIN 34 CITATION	42	13.75	37	13.5					27.33	5.33	11500
IRWIN 34 CITATION	42	13.8	37	13.5
Irwin 34 Citation	42	13.8	37	13.5					27.33	5.3	11500
IRWIN 34 CITATION	42	13.8	37	13.5	42	13.8
IRWIN 34 CITATION CB	42	13.75	37	13.5					27.33	8.1	11900
Irwin 34 Citation Cb	42	13.8	37	13.5					27.33	4	11900
IRWIN 34 CITATION CB	42	13.8	37	13.5	42	13.8
IRWIN 34 CITATION SD	42	13.8	37	13.5					27.33	4	11900
Irwin 34 Citation Sd	42	13.8	37	13.5					27.33	4	11900
IRWIN 34 CITATION SD	42	13.8	37	13.5	42	13.8
IRWIN 35 CITATION	46	14.2	41	13					28.54	6.5	11500
Irwin 35 Citation	46	14.2	41	13					28.54	6.5	11500
IRWIN 35 CITATION	46	14.2	41	13	46	14.2
IRWIN 35 CITATION	46	14.3	41	13
Irwin 35 Citation Sd	46	14.2	41	13					28.5	4.58	11500
IRWIN 35 CITATION SD	46	14.2	41	13					28.54	4.58	11500
IRWIN 35 CITATION SD	46	14.2	41	13	46	14.2
IRWIN 37 1 TON	48	15.7	42.5	11.8					30	6.3	15400
IRWIN 37 COMPETITION	48	15.7	42.5	11.8					30	6.25	15500
IRWIN 37 KETCH	42	17.5	35.6	12.6
IRWIN 37 Mk 1	42	14.3	35.5	14.5
IRWIN 37 Mk 3	42	17.5	35.5	12.5
IRWIN 37 ONE TON	48	15.7	42.5	11.8	48	15.7
Irwin 37 T	48	15.7	42.5	11.8					30	6.3	15400
IRWIN 37 Tall rig	48	15.7	42.5	11.9
IRWIN 37-1	42	14.3	35.5	14.5					30	5.5	18000
Irwin 37-1	42	14.3	35.5	14.5					30	5.5	18000
Irwin 37-1 Cb	42	14.3	35.5	14.5					30	4	20000
IRWIN 37-1 CB	42	14.3	35.5	14.5			8		30	4	20000
IRWIN 37-1 CB	42	14.3	35.5	14.5	42	14.3
IRWIN 37-1 KETCH	42	13.8	35.5	13.8	42	13.8	20.8	8.8
IRWIN 37-1 SD	42	14.3	35.5	14.5					30	4	20000
Irwin 37-1 Sd	42	14.3	35.5	14.5					30	4	20000
IRWIN 37-1 SD	42	14.3	35.5	14.5	42	14.3
IRWIN 37-1ITA	42	14.3	35.5	14.5	42	14.3
IRWIN 37-2	42	17.5	35.5	12.5					30	4	20000
Irwin 37-2 Cb	42	17.5	35.5	14.5					30	4	20000
IRWIN 37-2 CB	42	17.5	35.5	14.5	42	17.5
Irwin 37-3	42	17.5	35.5	12.5					30	5.5	20000
IRWIN 37-3	42	17.6	35.6	14.6					30	4	20000
IRWIN 37-3 CB	42	17.5	35.5	12.5	42	17.5	22.5	8.7
Irwin 37-3 Cb Kth	42	17.5	35.5	12.5					30	4	20000
IRWIN 37-3 CB KTH	42	17.6	35.6	12.9			22.16		30	8	20000
IRWIN 37-3 SD	42	17.5	35.5	12.5					30	4	20000
Irwin 37-3 Sd	42	17.5	35.5	12.5					30	4	20000
IRWIN 37-3 SD	42	17.5	35.5	12.5	42	17.5	22.5	8.7
IRWIN 37-4	42	17.5	35.6	14.6					30	5.5	20000
Irwin 37-4	42	17.5	35.6	14.6					30	5.6	20000
IRWIN 37-4 SD KTH	42	17.5	35.6	12.5					30	4	20000
Irwin 37-4 Sd Kth	42	17.5	35.6	12.5					30	4	20000
IRWIN 37-4/5	42	17.5	35.6	14.6	42	17.5
IRWIN 37-4/5 CB	42	17.5	35.6	14.6	42	17.5
IRWIN 37-4/5 SD	42	17.5	35.6	14.6	42	17.5
IRWIN 37-5	42	17.5	35.5	14.5					30	4	20000
Irwin 37-5 K	42	17.5	35.6	12.5					30	5.6	20000
IRWIN 37-5 KTCH	42	17.5	35.5	12.75			22.16		30	4	20000
IRWIN 38	45.3	15	40	13.5	45.3	15
IRWIN 38 CB	45.3	15	40	13.5	45.3	15
IRWIN 38 CITATION	40	15	44	14					30.67	6.92	15000
IRWIN 38 CITATION	49	15	44	14
Irwin 38 Citation	50	15	44	14					30.67	6.9	15000
IRWIN 38 CITATION	50	15	44	14	50	15
Irwin 38 Citation Sd	50	15	44	14					30.67	4.9	15000
IRWIN 38 CITATION SD	50	15	44	14					30.67	4.92	15000
IRWIN 38 CITATION SD	50	15	44	14	50	15
Irwin 38 Citation Wk	47.8	15	43	14							15000
IRWIN 38 Mk 1	45.5	15	40	15.5
IRWIN 38 Mk 2	49.3	17.8	43.5	16.1
IRWIN 38 MOD C	45	14.9	39.6	12.7
Irwin 38-1	45.25	15	40	13.5					27.5	5.75
IRWIN 38-1	45.25	15	40	13.5					27.5	9.58	15400
Irwin 38-1 Cb	45.3	15	40	13.5					27.5	3.8	15400
Irwin 38-2	49.3	17.8	43.5	16.1					32.5	4.5	20000
IRWIN 38-2	49.75	17.25	42.75	16					32.5	4.5	20000
Irwin 38-2 Cb	49.3	17.8	43.5	16.1					32.5
IRWIN 38-2NE	49.3	17.8	43.5	16.1	49.3	17.8
IRWIN 39 CITATION	52	16.5	46	14.75					31.17	6.25	16890
IRWIN 39 CITATION	52	16.5	46	14.8
Irwin 39 Citation	52	16.5	46	14.8					31.2	6.3	16890
IRWIN 39 CITATION	52	16.5	46	14.8	52	16.5
IRWIN 39 CITATION CB	52	16.5	46	14.8					31.17	9.5	17390
Irwin 39 Citation Cb	52	16.5	46	14.8					31.2	4.3	17390
IRWIN 39 CITATION CB	52	16.5	46	14.8	52	16.5
IRWIN 39 CITATION SD	52	16.5	46	14.8					31.17	4.3	17390
Irwin 39 Citation Sd	52	16.5	46	14.8					31.2	4.3	17390
IRWIN 39 CITATION SD	52	16.5	46	14.8	52	16.5

Click Here for other boat types or to check dimensions from other data bases. We now offer three data bases.

Sail Area Calculations

BOAT	I	J	P	E	ISP	JSP	PY	EY	Disp	LWL	DRAFT
Irwin 3/4 t	43.8	14	37.1	12	43.8	14	0	0	10000	27.58	4.5

The following formulas are approximate
Sail areas depend on lots of factors, leach hollow, foot round, luff hollow etc. Also, remember that jib sail area in general is based on the forestay length, I. But all things considered, these numbers are close but should not be considered exact. They are rules of thumb, not measurements of a this specific boat.

Mainsail

Mainsail = (P x E) / 2 = 223 sq ft
Racing Mainsail (add 10%) = 245 sq ft

Genoa

155% Genoa = (( J x I ) / 2) x 1.65 = 506 sq ft
135% Genoa = (( J x I ) / 2) x 1.44 = 442 sq ft

Jib

	_______
LP of full fore triangle = ( I x J ) / √	I² + J² = 13.3

Jib size to fill fore triangle = 95%
100% Jib = ( I x J ) / 2 = 307 sq ft

A more accurate LP calculator is HERE

Spinnaker

Spinnaker Area = Max Luff x Max Girth x ( 70-85%) = 771 to 936 sq ft
"Square" Spinnaker Area = Max Luff x Max Girth) = 1101 sq ft
AC Area = 917 sq ft
Maximum Luff (.95 * sqrt (JSP^2 + ISP^2) = 43.68 feet
Maximum Girth = 1.8 * JSP = 25.2 feet
Ref

DEFINITIONS

"P" is the luff length of the mainsail, measured along the aft face of the mast from the top of the boom to the highest point that the mainsail can be hoisted or black band.

"E" is the foot length of the mainsail, measured along the boom from the aft face of the mast to the outermost point on the boom to which the main can be pulled or to the black band.

"I" is measured along the front of mast from the genoa halyard to the main deck. The main deck is where the deck would be if there were no deckhouse.

"J" is the base of the foretriangle measured along the deck from the headstay pin to the front of the mast.

"JSP" is the length of the spinnaker pole or the distance from the forward end of the bowsprit (fully extended) to the front face of the mast.

"ISP" is measured from the highest spinnaker halyard to the deck.

"PY" and "EY" are, respectively the luff length and foot length of the mizzen of a yawl or ketch measured in the same way as for the mainsail.

"IY" is the measurement from the staysail halyard to the deck.

"JY" is the measurement from the staysail stay to the front face of the mast.

"LP" is the shortest distance between the clew and the luff of the genoa.

Data*

This data is supplied as a reference and all boat dimensions should be verified before using it in any critical application.
The information in these data bases is a starting point. There are errors as you can see as the different data bases do not always agree. In addition, some boats have been modified from stock and will not match the data in these databases. None of this data has been checked by L-36.com so please always check your boat before relying on this data.
Data is from a variety of sources.

db = SBD is used under the Creative Commons License sailboatdata.com (sailboatdata.com) / CC BY 3.0

db = PHRF is the PHRF Critical Dimensions database
db = WEB is the commonly available data found on many web sites
db = BIG is a combination of all of the above.

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