Seller's Description
The cockpit of the Cal 40 is large, and there is a large storage area at the aft.
This Cal has a tiller. The Cal 40 is balanced well, and steering with a tiller is not difficult. The cabin trunk is low and allows excellent visibility forward with wide side decks and a large foredeck for handling headsails.
These Cal 40s are well know for racing however they also have a comfortable and roomy cabin with a fold down two sided table with bench seat. Near by is a bathroom with head and sink.
Per the seller:
Original “vintage” Tillermaster autopilot and Signet instruments.
Harken furling with cruising yankee 138% and lightly used racing dacron 150%. Kevlar #3, tallboy.
Carbon removable sprit with 2 asymm kites, all original symm spin gear, poles, strings, 4 kites included.
Specs
- Designer
- C. William Lapworth
- Builder
- Jensen Marine/Cal Boats
- Association
- Cal 40 Site
- # Built
- 108
- Hull
- Monohull
- Keel
- Fin
- Rudder
- Spade
- Construction
- FG
Dimensions
- Length Overall
- 39′ 4″ / 12 m
- Waterline Length
- 30′ 3″ / 9.2 m
- Beam
- 10′ 11″ / 3.4 m
- Draft
- 5′ 6″ / 1.7 m
- Displacement
- 15,000 lb / 6,804 kg
- Ballast
- 6,000 lb / 2,722 kg (Lead)
Rig and Sails
- Type
- Sloop
- Reported Sail Area
- 700′² / 65 m²
- Total Sail Area
- 700′² / 65 m²
Mainsail
- Sail Area
- 350′² / 32.5 m²
- P
- 39′ 11″ / 12.2 m
- E
- 17′ 5″ / 5.3 m
- Air Draft
- ?
Foresail
- Sail Area
- 350′² / 32.5 m²
- I
- 45′ 11″ / 14 m
- J
- 15′ 2″ / 4.6 m
- Forestay Length
- 48′ 5″ / 14.8 m
Auxilary Power
- Make
- Perkins
- Model
- 4108
- HP
- 50
- Fuel Type
- Diesel
- Fuel Capacity
- ?
- Engine Hours
- ?
Accomodations
- Water Capacity
- ?
- Holding Tank Capacity
- ?
- Headroom
- ?
- Cabins
- ?
Calculations
- Hull Speed
-
8.3 kn
Classic: 7.38 kn
Hull Speed
The theoretical maximum speed that a displacement hull can move efficiently through the water is determined by it's waterline length and displacement. It may be unable to reach this speed if the boat is underpowered or heavily loaded, though it may exceed this speed given enough power. Read more.
Formula
Classic hull speed formula:
Hull Speed = 1.34 x √LWL
A more accurate formula devised by Dave Gerr in The Propeller Handbook replaces the Speed/Length ratio constant of 1.34 with a calculation based on the Displacement/Length ratio.
Max Speed/Length ratio = 8.26 ÷ Displacement/Length ratio.311
Hull Speed = Max Speed/Length ratio x √LWL
- Sail Area/Displacement
-
18.4
Sail Area / Displacement Ratio
A measure of the power of the sails relative to the weight of the boat. The higher the number, the higher the performance, but the harder the boat will be to handle. This ratio is a "non-dimensional" value that facilitates comparisons between boats of different types and sizes. Read more.
Formula
SA/D = SA ÷ (D ÷ 64)2/3
- SA: Sail area in square feet, derived by adding the mainsail area to 100% of the foretriangle area (the lateral area above the deck between the mast and the forestay).
- D: Displacement in pounds.
- Ballast/Displacement
-
40.0
>40: stiffer, more powerful
Ballast / Displacement Ratio
A measure of the stability of a boat's hull that suggests how well a monohull will stand up to its sails. The ballast displacement ratio indicates how much of the weight of a boat is placed for maximum stability against capsizing and is an indicator of stiffness and resistance to capsize.
Formula
Ballast / Displacement * 100
- Displacement/Length
-
240.4
200-300: moderate
Displacement / Length Ratio
A measure of the weight of the boat relative to it's length at the waterline. The higher a boat’s D/L ratio, the more easily it will carry a load and the more comfortable its motion will be. The lower a boat's ratio is, the less power it takes to drive the boat to its nominal hull speed or beyond. Read more.
Formula
D/L = (D ÷ 2240) ÷ (0.01 x LWL)³
- D: Displacement of the boat in pounds.
- LWL: Waterline length in feet
- Comfort Ratio
-
28.6
20-30: coastal cruiser
Comfort Ratio
This ratio assess how quickly and abruptly a boat’s hull reacts to waves in a significant seaway, these being the elements of a boat’s motion most likely to cause seasickness. Read more.
Formula
Comfort ratio = D ÷ (.65 x (.7 LWL + .3 LOA) x Beam1.33)
- D: Displacement of the boat in pounds
- LWL: Waterline length in feet
- LOA: Length overall in feet
- Beam: Width of boat at the widest point in feet
- Capsize Screening
-
1.8
<2.0: better suited for ocean passages
Capsize Screening Formula
This formula attempts to indicate whether a given boat might be too wide and light to readily right itself after being overturned in extreme conditions. Read more.
Formula
CSV = Beam ÷ ³√(D / 64)
- Beam: Width of boat at the widest point in feet
- D: Displacement of the boat in pounds
Notes
The accolades for this particular boat are many. Certainly one of the most influential designs and successful racing boats ever. With 160 built, it was also a commercial success for Jensen Marine.
Less mention is made of the man, George Griffith, who actually commissioned the design, and agreed to back the construction of the first ten boats.
This added note from Robert VanderPol II:
“There is a single example of a raised deck Cal 40 similar to the Cal 25 & 28. Jensen Marine was promised a number of orders. All but one backed out at the last minute and only one was built and delivered.”
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