Detailed sailboat specifications and datasheets since 2015
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Etap 28i Fin keel

Sailboat specifications

The Etap 28i is a 28’1” (8.58m) cruising sailboat designed by Harlé-Mortain (France). She was built between 1987 and 1996 by Etap (Belgium). The Fin keel version adopts a classical fin configuration, the easiest option to provide a low center of gravity.

Etap 28i's main features

Model
Etap 28i
Version
Fin keel
Hull type
Monohull
Category
Cruising sailboat
Sailboat builder
Sailboat designer
Country
Belgium
Construction
GRP (glass reinforced polyester):
Sandwich foam fiberglass polyester
Number of hulls built
About 450
First built hull
1987
Last built hull
1996
Appendages
Keel : fin without bulb
Helm
Single tiller
Rudder
Single spade rudder
Unsinkable
Yes
Trailerable
No
Former French navigation category
2
Standard public price ex. VAT (indicative only)
N/A

Etap 28i's main dimensions

Hull length
28’ 1”8.58 m
Waterline length
24’ 5”7.45 m
Beam (width)
10’ 4”3.13 m
Draft
5’ 4”1.63 m
Mast height from DWL
44’ 1”13.45 m
Light displacement (MLC)
6063 lb2750 kg
Ballast weight
1808 lb820 kg
Ballast type
Cast iron

Etap 28i's rig and sails

Upwind sail area
469 ft²43.57 m²
Downwind sail area
815 ft²75.67 m²
Mainsail area
221 ft²20.57 m²
Genoa area
248 ft²23 m²
Jib area
165 ft²15.35 m²
Symmetric spinnaker area
593 ft²55.1 m²
I
 iFore triangle height (from mast foot to fore stay top attachment)
32’ 6”9.9 m
J
 iFore triangle base (from mast foot to bottom of forestay)
9’ 7”2.94 m
P
 iMainsail hoist measurement (from tack to head)
35’ 4”10.75 m
E
 iMainsail foot measurement (from tack to clew)
11’ 5”3.48 m
Rigging type
Sloop Marconi 7/8
Mast configuration
Deck stepped mast
Rotating spars
No
Number of levels of spreaders
1
Spreaders angle
Swept-back
Spars construction
Aluminum spars
Standing rigging
1x19 strand wire continuous

Etap 28i's performances

HN (French rating)
 iHN or "Handicap Nationale" is an empirical rating system used in France allowing various monohulls, of different sizes and designs, to race each other fairly. It is particularly suitable for cruiser and cruiser-racer. Therefore, by comparing these values, we can have an indication of the relative speed of 2 boats.
15.5
Upwind sail area to displacement
 iThe ratio sail area to displacement is obtained by dividing the sail area by the boat's displaced volume to the power two-thirds.

The ratio sail area to displacement can be used to compare the relative sail plan of different sailboats no matter what their size.

Upwind: under 18 the ratio indicates a cruise oriented sailboat with limited performances especially in light wind, while over 25 it indicates a fast sailboat.
239 ft²/T22.2 m²/T
Downwind sail area to displacement
 iThe ratio sail area to displacement is obtained by dividing the sail area by the boat's displaced volume to the power two-thirds.

The ratio sail area to displacement can be used to compare the relative sail plan of different sailboats no matter what their size.
415 ft²/T38.55 m²/T
Displacement-length ratio (DLR)
 iThe Displacement Length Ratio (DLR) is a figure that points out the boat's weight compared to its waterline length. The DLR is obtained by dividing the boat's displacement in tons by the cube of one one-hundredth of the waterline length (in feet).
The DLR can be used to compare the relative mass of different sailboats no matter what their length:

a DLR less than 180 is indicative of a really light sailboat (race boat made for planning), while a DLR greater than 300 is indicative of a heavy cruising sailboat.
188
Ballast ratio
 iThe Ballast ratio is an indicator of stability; it is obtained by dividing the boat's displacement by the mass of the ballast. Since the stability depends also of the hull shapes and the position of the center of gravity, only the boats with similar ballast arrangements and hull shapes should be compared.

The higher the ballast ratio is, the greater is the stability.
30 %
Wetted area
184 ft²17.05 m²
Righting moment @ 1°
 iThe righting moment is a moment (torque) that tends to restore a boat to its previous position after heeling. Its value corresponds to the torque needed to heel the boat for this angle.
Higher the righting moment is for an angle, greater is the stability.
367 lb.ft51 kg.m
Maximum transverse section
10 ft²0.9 m²
Critical hull speed
 iAs a ship moves in the water, it creates standing waves that oppose its movement. This effect increases dramatically the resistance when the boat reaches a speed-length ratio (speed-length ratio is the ratio between the speed in knots and the square root of the waterline length in feet) of about 1.2 (corresponding to a Froude Number of 0.35) . This very sharp rise in resistance, between speed-length ratio of 1.2 to 1.5, is insurmountable for heavy sailboats and so becomes an apparent barrier. This leads to the concept of "hull speed".
The hull speed is obtained by multiplying the square root of the waterline length (in feet) by 1.34.
6.62 knots

Etap 28i's auxiliary engine

Engine(s)
1 inboard engine
Engine(s) power (min./max.)
9 HP / 18 HP
Fuel type
Diesel
Fuel tank capacity
9.2 gal35 liters

Etap 28i's accommodations and layout

Cockpit
Closed aft cockpit
Cabin(s)
1
Berth(s)
6
Head(s)
1
Freshwater tank capacity
22.5 gal85 liters
Fridge/ice-box capacity
11.9 gal45 liters
Maximum headroom
6’ 1”1.86 m
Head headroom
5’ 10”1.76 m

Etap 28i's saloon

Maximum headroom
5’ 11”1.8 m
Saloon table length
3’ 1”0.96 m
Saloon table width (min./max.)
2’ 4”0.69 m / 2’ 7”0.8 m
Berth length
5’ 6”1.68 m
Berth width
1’ 8”0.52 m

Etap 28i's fore cabin

Berth length
5’ 8”1.75 m
Berth width (head/feet)
4’ 1”1.24 m / 0’ 10”0.25 m

Etap 28i's aft cabin

Maximum headroom
5’ 10”1.76 m
Berth length
6’ 2”1.9 m
Berth width (head/feet)
4’ 11”1.48 m / 2’ 7”0.8 m
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