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2022
Designer
Niels Jeppesen
Builder
Arcona Yachts (Boo Marine)
Associations
?
# Built
?
Hull
?
Keel
Fin + Bulb
Rudder
Twin
Construction
GRP

Dimensions

Length Overall
51 10 / 15.8 m
Length On Deck
49 2 / 15 m
Waterline Length
45 10 / 14 m
Beam
15 1 / 4.6 m
Draft
9 8 / 3 m
Displacement
30,640 lb / 13,900 kg
Ballast
11,460 lb / 5,200 kg
Drawing of Arcona 50

Rig and Sails

Type
Fractional Sloop
Reported Sail Area
1,529′² / 142 m²
Total Sail Area
1,390′² / 129.1 m²
Mainsail
Sail Area
741′² / 68.8 m²
P
65 11 / 20.1 m
E
22 5 / 6.9 m
Air Draft
78 11 / 24.1 m
Foresail
Sail Area
649′² / 60.3 m²
I
68 10 / 21 m
J
18 9 / 5.7 m
Forestay Length
71 5 / 21.8 m

Auxilary Power

Make
Yanmar
Model
4JH80CR
HP
80
Fuel Type
Diesel; Saildrive
Fuel Capacity
102 gal / 385 l

Accomodations

Water Capacity
99 gal / 375 l
Holding Tank Capacity
?
Headroom
?
Cabins
?

Calculations

Hull Speed
12.0 kn
Classic: 9.08 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

11.98 knots
Classic formula: 9.08 knots
Sail Area/Displacement
25.0
>20: high 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.
24.97
<16: under powered
16-20: good performance
>20: high performance
Ballast/Displacement
37.4
<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

37.41
<40: less stiff, less powerful
>40: stiffer, more powerful
Displacement/Length
141.8
100-200: light

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
141.78
<100: ultralight
100-200: light
200-300: moderate
300-400: heavy
>400: very heavy
Comfort Ratio
26.6
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
26.55
<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
1.9
<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
1.93
<2: better suited for ocean passages
>2: better suited for coastal cruising

Notes

LOA above includes optional bowsprit.
Displacement above is lightship.
Deep keel standard.
Medium draft keel: draft - 2.5 m /8.2 ft; Ballast - 5,800 kg / 12,786.8 lbs.
Shallow draft keel: draft - 2.2 m /7.2 ft; Ballast - 6,100 kg / 13,448.2 lbs.
Available with optional 100 hp motor.
Sail area:
-Main: 86 m² / 925.7 ft²
-Self-tacking jib: 56 m² / 602.8 ft²
-Optional 110% Jib: 65 m² / 700 ft²
-Asym Spinnaker: 222 m² / 2,389.6 ft²

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Measurements:

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