Cal T/4

Cal T/4

Development
Designer	C. William Lapworth
Location	Canada United States
Year	1971
No. built	238
Builder(s)	Cal Yachts
Role	Racer
Name	Cal T/4
Boat
Boat weight	4,000 lb (1,814 kg)
Draft	4.00 ft (1.22 m)
Hull
Type	monohull
Construction	fiberglass
LOA	24.17 ft (7.37 m)
LWL	21.00 ft (6.40 m)
Beam	8.00 ft (2.44 m)
Engine type	outboard motor
Hull appendages
Keel/board type	fin keel
Ballast	2,000 lb (907 kg)
Rudder(s)	transom-mounted rudder
Rig
Rig type	Bermuda rig
I foretriangle height	30.00 ft (9.14 m)
J foretriangle base	10.00 ft (3.05 m)
P mainsail luff	23.60 ft (7.19 m)
E mainsail foot	9.00 ft (2.74 m)
Sails
Sailplan	masthead sloop
Mainsail area	106.20 sq ft (9.866 m2)
Jib/genoa area	150.00 sq ft (13.935 m2)
Total sail area	256.20 sq ft (23.802 m2)
Racing
PHRF	234

The Cal T/4 is an American trailerable sailboat that was designed by C. William Lapworth as an International Offshore Rule Quarter Ton class racer and first built in 1971. ^{[1] [2] [3]}

Production

The design was built by Cal Yachts, a brand of Jensen Marine in the United States. It was produced from 1971 to 1972 with 238 boats completed, but it is now out of production. ^{[1] [3] [4]}

Design

The Cal T/4 is a racing keelboat, built predominantly of fiberglass, with wood trim. It has a masthead sloop rig; a raked stem; a raised counter, reverse transom; a transom-hung rudder controlled by a tiller and a fixed fin keel. It displaces 4,000 lb (1,814 kg) and carries 2,000 lb (907 kg) of ballast. ^{[1] [3]}

The boat has a draft of 4.00 ft (1.22 m) with the standard keel and is normally fitted with a small 3 to 6 hp (2 to 4 kW) outboard motor for docking and maneuvering. Cabin headroom is 63 in (160 cm), but the cockpit has 78 in (200 cm) of headroom under the boom. ^{[1] [3]}

The design has a PHRF racing average handicap of 234 and a hull speed of 6.1 kn (11.3 km/h). ^[3]

Operational history

The design was raced on some Quarter on Class races in the 1970s and 1980, but was not noted as winning any of the larger competitions. ^[3]

The boat is supported by an active racing club that organizes racing events, the Quarter Ton Class. ^[5]

In a 2010 review Steve Henkel wrote, "the boat was named the T/4 for her builder’s intent that she do well in Quarter Ton racing. (We think she did fairly well in the few official Quarter Ton races staged in the 1970s and 1980s, but fell short of producing headlines.) Best features: With 4-foot deep fin keel, spade rudder, and 50 percent ballast to displacement ratio, she could run rings around the comp[etitor]s ... She has been described as an E-type Jag: robust, quick, agile, and fun. The high-aspect main is rigged far enough above the deck to give standing, headroom for tall people standing up in the cockpit (more than 6'6" clearance over the cockpit sole). Worst features: Compared with her comp[etitor]s, she has less headroom below, a lower Space Index, and perhaps lower directional stability (because of her relatively high aspect ratio keel)." ^[3]

See also

• List of sailing boat types

References

1. McArthur, Bruce (2020). "Cal T/4 sailboat". sailboatdata.com. Archived from the original on 29 January 2021. Retrieved 29 January 2021.
2. McArthur, Bruce (2020). "C. William Lapworth 1919 - 2006". sailboatdata.com. Archived from the original on 23 January 2021. Retrieved 29 January 2021.
3. Henkel, Steve: The Sailor's Book of Small Cruising Sailboats, page 281. International Marine/McGraw-Hill, 2010. ISBN   978-0-07-163652-0
4. McArthur, Bruce (2020). "Jensen Marine/Cal Boats 1956 - 1989". sailboatdata.com. Archived from the original on 23 January 2021. Retrieved 29 January 2021.
5. McArthur, Bruce (2020). "Quarter Ton Class". sailboatdata.com. Archived from the original on 29 January 2021. Retrieved 29 January 2021.

External links

• Archived advertisement for the Cal T/4's introduction