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1961 — 1967
Alberg 35 insignia
Designer
Carl Alberg
Builder
Pearson Yachts
Association
Alberg 35 User Group
# Built
280
Hull
Monohull
Keel
Long
Rudder
?
Construction
FG w/balsa core deck

Dimensions

Length Overall
34 8 / 10.6 m
Waterline Length
24 0 / 7.3 m
Beam
9 8 / 3 m
Draft
5 1 / 1.6 m
Displacement
12,600 lb / 5,715 kg
Ballast
5,300 lb / 2,404 kg (Lead (internal))
Drawing of Alberg 35
  • 1 / 4
  • 2 / 4
  • 3 / 4
  • 4 / 4

Rig and Sails

Type
Sloop
Reported Sail Area
545′² / 50.6 m²
Total Sail Area
545′² / 50.6 m²
Mainsail
Sail Area
276′² / 25.6 m²
P
35 0 / 10.7 m
E
15 8 / 4.8 m
Air Draft
44 5 / 13.6 m
Foresail
Sail Area
269′² / 25 m²
I
40 5 / 12.3 m
J
13 3 / 4.1 m
Forestay Length
42 7 / 13 m

Auxilary Power

Make
Universal
Model
Atomic 4
HP
27
Fuel Type
Gas
Fuel Capacity
30 gal / 114 l

Accomodations

Water Capacity
48 gal / 182 l
Holding Tank Capacity
?
Headroom
?
Cabins
?

Calculations

Hull Speed
6.3 kn
Classic: 6.57 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

6.25 knots
Classic formula: 6.57 knots
Sail Area/Displacement
16.1
16-20: good performance

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.
16.1
<16: under powered
16-20: good performance
>20: high performance
Ballast/Displacement
42.1
>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

42.06
<40: less stiff, less powerful
>40: stiffer, more powerful
Displacement/Length
406.1
>400: very heavy

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
406.08
<100: ultralight
100-200: light
200-300: moderate
300-400: heavy
>400: very heavy
Comfort Ratio
34.5
30-40: moderate bluewater cruising boat

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
34.53
<20: lightweight racing boat
20-30: coastal cruiser
30-40: moderate bluewater cruising boat
40-50: heavy bluewater boat
>50: extremely heavy bluewater boat
Capsize Screening
1.7
<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
1.66
<2: better suited for ocean passages
>2: better suited for coastal cruising

Notes

From BlueWaterBoats.org:

The Alberg 35 is a classic cruising from the board of Carl Alberg, built by Pearson Yachts from Rhode Island and introduced in 1961. It earned a good reputation for her fine sailing qualities, and with a six year production run of 280 boats, she was considered a success for her builder.

By todays standards the Alberg 35 may not offer the latest in performance or much room below decks, but she still delivers fine time honoured cruising qualities. The Alberg 35 is well designed, safe, and capable of serious offshore cruising; best of all she’s good looking and affordable.

Configuration and Construction

As with all Alberg designs and in fact many sailboats of that period, the Alberg 35 derives its ancestry from Scandinavian folkboat influence. These designs are known for their classic beauty, safety and relatively good performance. Expect a springy sheer line, long overhangs, full keel with a forefoot cutaway.

Designed as a racer/cruiser and reflecting the latest thinking of her day, the beam is very narrow beam, only 9 feet 8 inches. The waterline is short at only 24 feet, which is good for light airs, but as the breeze stiffens the waterline will also extend by laying down on her long overhangs.

The hull and deck are of fiberglass construction, a very new material at the time, so hull thicknesses were conservative and heavy, an inch thick below the waterline. The deck is cored in balsa, resulting in a light and stiff structure with good heat and sound insulation, but note the early boats were not end grained balsa with its superior compression strength.

The cutaway keel has 5,300 pounds of lead as ballast which is cast into the keel cavity and encapsulated in fiberglass. The keel-hung rudder is normally on a tiller but some boats can be found with the optional wheel steering.

Layout

The boat came with two interior layouts. A dinette layout which has the cabin table dropping to form a wide berth to port while the galley was situated to starboard with a 3-burner stove, an icebox, and pantry lockers. The more commonly illustrated layout has settees to port and starboard of the cabin with the galley situated in the companionway area.

Engine accessibility is good, several panels can be removed to reveal complete access. Water and fuel are located below the cabin sole, the bilge is deep and safeguards against water sloshing into the lockers.

Under Sail

Performance underway is typical of folkboat influenced designs, her narrow beam and slack bilges make for a tender boat. She heels easily to an angle of 25 degrees before stiffening up. Inherent in the long overhangs of the hull shape, the waterline lengthens and so hull speed is in fact faster than the LWL figures may suggest. These designs also have a tendency to hobbyhorse.

The mainsail is known to be a bit large in relation to the foresail, giving the boat a weather helm which becomes particularly strong under a reach. Some owners have fitted small bowsprits to their boats in order to correct for this, while others shorten the long boom to reduce the mainsail.

Where the skinny hull containing deep wineglass sections and a decent displacement pays dividends is in the area of seakindly motion. The boat has a very gentle motion, and is especially seaworthy. Alberg himself cited a story of an Alberg 35 riding out the 1979 storm which claimed 16 lives in the Fastnet race with little fanfare other than battening down the hatches, eating, drinking and playing cards.

Buyer Notes

Watch for delamination in the deck or any water damage to the balsa coring (tap the deck with a mallet and listen for a dull or hollow thud sound). Especially around fittings and stanchions. Check for cracking, bending or movement in the mast compression post and supporting structure. For offshore work some recommend beefing up the bulkhead in this region.

Check tankage, early boats had galvanized tank which will eventually corrode through.

As with any boat of this age check the wiring, if not already completed by previous owners, they will need an extensive rewire.

Links, References and Further Reading

» An article on the Alberg 35 and Alberg 37, Cruising World Magazine, July 2002
» Alberg 35 Review by Gregg Nestor, Twenty Affordable Sailboats to Take You Anywhere
» The Alberg 35 users group, articles and information.

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