Irwin 10/4
{{Short description|Sailboat class}}
{{Use dmy dates|date=May 2021}}
{{Use American English|date=May 2021}}
{{Infobox sailboat specifications
|name = Irwin 10/4
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|designer = Ted Irwin and Walter Scott
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|location = United States
|year = 1975
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|builder = Irwin Yachts
|role = Cruiser
|boats =
|crew =
|trapeze =
|draft = {{convert|6.67|ft|m|abbr=on}}, with centerboard down
|air draft =
|displacement = {{convert|7000|lb|kg|0|abbr=on}}
|hulls =
|hull type = monohull
|construction = fiberglass
|loa = {{convert|25.33|ft|m|abbr=on}}
|loh =
|lwl = {{convert|21.83|ft|m|abbr=on}}
|beam = {{convert|10.33|ft|m|abbr=on}}
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|engine = Yanmar {{convert|8|hp|kW|0|abbr=on}} diesel engine or Universal Atomic 2 gasoline engine
|appendages =
|keel type = modified long keel
|ballast = {{convert|2000|lb|kg|0|abbr=on}}
|rudder type = internally-mounted spade-type rudder
|rigs =
|rig type = Cutter rig
|I = {{convert|35.00|ft|m|abbr=on}}
|J = {{convert|12.00|ft|m|abbr=on}}
|P = {{convert|30.16|ft|m|abbr=on}}
|E = {{convert|12.25|ft|m|abbr=on}}
|mast length =
|rig other =
|sails =
|sailplan = cutter rigged sloop
|sailarea main = {{convert|184.73|sqft|m2|abbr=on}}
|sailarea headsail = {{convert|210.00|sqft|m2|abbr=on}}
|sailarea spin =
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|sailarea total = {{convert|394.73|sqft|m2|abbr=on}}
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|phrf = 234
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The Irwin 10/4 is an American trailerable sailboat that was designed by Ted Irwin and Walter Scott as a cruiser and first built in 1975.{{cite web|url= https://sailboatdata.com/sailboat/irwin-104|title= Irwin 10/4 sailboat |access-date= 27 May 2021|last= McArthur| first= Bruce |work= sailboatdata.com|year= 2020|archive-url= https://archive.today/20210526021116/https://sailboatdata.com/sailboat/irwin-104|archive-date= 26 May 2021|url-status= live}}{{cite web|url= https://sailboatdata.com/designer/irwin-ted|title= Ted Irwin 1940 - 2015|access-date = 27 May 2021|last= McArthur| first = Bruce |work = sailboatdata.com|year = 2021|archive-url= https://archive.today/20200518142435/https://sailboatdata.com/designer/irwin-ted|archive-date= 18 May 2020|url-status= live}}{{cite web|url= https://sailboatdata.com/designer/scott-walter|title= Walter Scott|access-date = 27 May 2021|last= McArthur| first = Bruce |work = sailboatdata.com|year = 2021|archive-url= https://archive.today/20210213150235/https://sailboatdata.com/designer/scott-walter|archive-date= 13 February 2021|url-status= live}}Henkel, Steve: The Sailor's Book of Small Cruising Sailboats, page 347. International Marine/McGraw-Hill, 2010. {{ISBN|978-0-07-163652-0}}
Unconventionally, the boat's designation indicates its beam of {{convert|10|ft|4|in|m|abbr=on}}, rather than its length overall.
Production
The design was built by Irwin Yachts in the United States, from 1975 until 1982, but it is now out of production.{{cite web|url = https://sailboatdata.com/builder/irwin-yachts|title = Irwin Yachts 1966 - 1992|access-date = 27 May 2021|last= McArthur| first = Bruce |work = sailboatdata.com|year = 2021|archive-url= https://archive.today/20210526021133/https://sailboatdata.com/builder/irwin-yachts|archive-date= 26 May 2021|url-status= live}}
Design
The Irwin 10/4 is a recreational keelboat, built predominantly of fiberglass, with wood trim. It is a cutter rigged sloop, with a raked stem with a bowsprit, an angled transom, an internally mounted spade-type rudder controlled by a wheel and a fixed long keel, with a cutaway forefoot and a centerboard. It displaces {{convert|7000|lb|kg|0|abbr=on}} and carries {{convert|2000|lb|kg|0|abbr=on}} of ballast.
The boat has a draft of {{convert|6.67|ft|m|abbr=on}} with the centerboard extended and {{convert|2.75|ft|m|abbr=on}} with it retracted, allowing operation in shallow water, or ground transportation on a trailer.
The boat is fitted with a Japanese Yanmar diesel engine of {{convert|8|hp|kW|0|abbr=on}} or a Universal Atomic 2 gasoline engine for docking and maneuvering. The fuel tank holds {{convert|20|u.s.gal}} and the fresh water tank has a capacity of {{convert|45|u.s.gal}}.
The design has sleeping accommodation for four people, with a double "V"-berth in the bow cabin and a U-shaped settee in the main cabin that can be combined with a drop-dinette table to become a second double berth. The galley is located on the starboard side just forward of the companionway ladder. The galley is L-shaped and is equipped with a two-burner stove and a sink. The icebox is accessible from both the galley and the cockpit. The enclosed head is located just aft of the bow cabin on the port side. Cabin headroom is {{convert|68|in|cm|0|abbr=on}}.
The design has a PHRF racing average handicap of 234 and a hull speed of {{convert|6.3|kn|km/h|abbr=on}}.
Operational history
The boat is supported by an active class club, the Irwin Yacht Owners.{{cite web|url= https://sailboatdata.com/association/irwin-yacht-owners|title= Irwin Yacht Owners|access-date = 27 May 2021|last= McArthur| first = Bruce |work = sailboatdata.com|year = 2021|archive-url= https://archive.today/20210526021147/https://sailboatdata.com/association/irwin-yacht-owners|archive-date= 26 May 2021|url-status= live}}
In a 2010 review Steve Henkel wrote, "best features: Her layout below provides a feeling of spaciousness rare in a 25-footer. Her heavy displacement and wide beam makes her stable in a breeze. The icebox, on the port side, is accessible both from the cockpit (so those on deck don't have to bother the cook to get a cold drink) and also from below deck. Worst features: In light air she's slow. There was one of these in our home harbor, and I remember literally running rings around her in four or five knots with our (then) South Coast 23. Over 10 knots of breeze, she peps up."
See also
References
{{Reflist}}
External links
- [https://archive.today/20210527221314/https://img.scgpix.com/listimg/img1_1216/30/img_WdwmtLHkwmdECSt.jpg Photo of a Irwin 10/4]
- [https://www.youtube.com/watch?v=qxNb1YSGDo4 Video of an Irwin 10/4 sailing]
{{Irwin Yachts}}
{{Trailer sailers and Trailer yachts worldwide}}
Category:1970s sailboat type designs
Category:Sailboat type designs by Ted Irwin