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Seller's Description

If you are looking for an exciting cruiser for day sails or a platform to cruise along the coast, you have found it with this 1978 Norman Cross 36 MK II Trimaran. Classic design by Norman Cross who was strongly influential in the refinement of designing multihulls in San Diego, California.

Cross introduced the 34 and provided a stretched version 36 MK II to take a step up from the traditional “cruiser” model designed for a higher potential of speed without getting into racing.

Two large berths on port and starboard, a centralized salon and forward storage and head. The galley has an electric mini-fridge, foot pump sinks and counter space for your navigation charts, radio and other equipment of your choosing.

The head is pleasantly designed to do the basics without the odor or muck of holding tanks.

This trimaran is perfect for the minimalist with the true basics and functional life of sailing on the water.

With 6’ 1” head clearance, there is easy movement forward or aft without crowning your head when maneuvering below deck.

Plenty of self-reliant power with the two Kyocera marine grade solar panels.

The seller has done over $12,000 in newer hull and deck paint and other improvements.

Per the previous owner, the inboard engine was seized and costly to repair due to limited parts. The inboard engine and fuel tank have been removed. She is powered with the simplicity of a 9.9 HP outboard and customized motor mount.

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Specs

Designer
Peter Norlin
Builder
Solna Marine (SWE)
Associations
?
# Built
?
Hull
Monohull
Keel
Fin
Rudder
Skeg
Construction
FG

Dimensions

Length Overall
34 4 / 10.5 m
Waterline Length
28 2 / 8.6 m
Beam
11 0 / 3.4 m
Draft
6 6 / 2 m
Displacement
14,330 lb / 6,500 kg
Ballast
5,290 lb / 2,400 kg (Lead)

Rig and Sails

Type
Sloop
Reported Sail Area
582′² / 54.1 m²
Total Sail Area
582′² / 54.1 m²
Mainsail
Sail Area
233′² / 21.7 m²
P
40 8 / 12.4 m
E
11 5 / 3.5 m
Air Draft
?
Foresail
Sail Area
348′² / 32.4 m²
I
47 2 / 14.4 m
J
14 9 / 4.5 m
Forestay Length
49 5 / 15.1 m

Auxilary Power

Make
?
Model
?
HP
?
Fuel Type
?
Fuel Capacity
?
Engine Hours
?

Accomodations

Water Capacity
?
Holding Tank Capacity
?
Headroom
?
Cabins
?

Calculations

Hull Speed
7.6 kn
Classic: 7.12 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

7.57 knots
Classic formula: 7.12 knots
Sail Area/Displacement
15.8
<16: under powered

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.
15.78
<16: under powered
16-20: good performance
>20: high performance
Ballast/Displacement
36.9
<40: less stiff, less 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

36.92
<40: less stiff, less powerful
>40: stiffer, more powerful
Displacement/Length
284.8
275-350: 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
284.81
<100: ultralight
100-200: light
200-300: moderate
300-400: heavy
>400: very heavy
Comfort Ratio
29.8
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
29.79
<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
1.8
<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
1.82
<2: better suited for ocean passages
>2: better suited for coastal cruising

Notes

Thanks to Paul Keller for photo and updated info on this yacht.

This listing is presented by PopYachts.com. Visit their website for more information or to contact the seller.

View on PopYachts.com

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