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Sailboat specifications and datasheets

Etap 28i fin keel

The Etap 28i, here in "fin keel" version, is a 28’1” monohull sailboat designed by Philippe Harlé and Alain Mortain. She was built by Etap (Belgium) and made of monolithic fiberglass / polyester. This sailboat was produced between 1987 and 1996 with about 450 hulls completed.
Etap 28i Etap 28i sailplanEtap 28i layoutEtap 28i sailingEtap 28i accommodations
Etap 28i's   Main Features
Model Etap 28i
Version Fin keel
Type of hull Monohull
Shipyard
Designer Philippe Harlé
Alain Mortain
Construction Hull and deck:
monolithic fiberglass / polyester
First built hull 1987
Last built hull 1996
Number of hulls built About 450
Appendages Keel :
Fin without bulb
Helm 1 tiller
Rudder 1 spade rudder
Unsinkable Yes
Trailerable No
French navigation category 2
Standard public price (indicative only) N/A
Etap 28i's   Main dimensions
Hull length 28’ 1”
Waterline length 24’ 5”
Beam (width) 10’ 4”
Draft 5’ 4”
Mast height from DWL 44’ 1”
Light displacement 6063 lbs
Ballast weight 1808 lbs
Ballast type Cast iron
Etap 28i's   Rig and sails
Upwind sail area 469 sq.ft
Downwind sail area 815 sq.ft
Mainsail area 221 sq.ft
Genoa area 248 sq.ft
Jib area 165 sq.ft
Symetric spinnaker area 593 sq.ft
Rigging type Sloop Marconi 7/8
Mast position Deck stepped mast
Spars Mast and boom in Aluminum
Standing rigging 1x19 strand wire continuous
Number of levels of spreaders 1
Spreaders angle Swept-back
IiFore triangle height (from mast foot to fore stay attachment) 32’ 6”
JiFore triangle base (from mast foot to bottom of forestay) 9’ 7”
PiMainsail hoist measurement (from tack to head) 35’ 4”
EiMainsail foot measurement (from tack to clew) 11’ 5”
Etap 28i's   Performances
HN (French rating) 15.5
Upwind sail area to displacementiThe 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 23 it indicates a fast sailboat.
22.20
Downwind sail area to displacementiThe 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 23 it indicates a fast sailboat.
38.55
Displacement-Length ratio (DLR)iThe Displacement Length ratio is a figure that points out the boat's weight compared to its waterline length. 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 ratioiThe Ballast ratio is an indicator of the stability; it is obtained by dividing the boat's displacement by the weight of the ballast. Since the stability depends also of the hull shape and the position of the center of gravity, only boats with similar ballast arrangements and hull shape should be considered.
Higher the ballast ratio is, greater is the stability.
30 %
Wetted surface 184 sq.ft
Righting moment @ 1°iThe righting moment is a moment (torque) that tends to restore a boat to its previous position after a rotational displacement. 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 at this angle.
367 lbs.ft
Maximum transverse section 10 sq.ft
Hull speediAs 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
Engine type Inboard engine
Engine (min/max) 9 HP / 18 HP
Fuel type Diesel
Fuel tank capacity 9.2 gal
Etap 28i's   Accommodation
Cabin(s) 1
Berth(s) 6
Head(s) 1
Fresh water tank capacity 22.5 gal
Fridge/ice-box capacity 11.9 gal
Maximum headroom 6’ 1”
Head headroom 5’ 10”
Etap 28i's   Saloon
Maximum headroom 5’ 11”
Saloon table length 3’ 1”
Saloon table width (min/max) 2’ 4” / 2’ 7”
Berth length 5’ 6”
Berth width 1’ 8”
Etap 28i's   Fore cabin
Berth length 5’ 8”
Berth width (head/feet) 4’ 1”
0’ 10”
Etap 28i's   Aft cabin
Maximum headroom 5’ 10”
Berth length 6’ 2”
Berth width (head/feet) 4’ 11”
2’ 7”

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