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Sailboat specifications and datasheets

Kelt 5.50 lifting keel

The Kelt 5.50, here in "lifting keel" version, is a 17’11” coastal monohull sailboat designed by Gilles Ollier. She was built by Kelt (France) and made of monolithic fiberglass / polyester. This sailboat was produced between 1978 and 1982 with about 600 hulls completed.

The Kelt 5.50 belongs to the Micro class.

Kelt 5.50 Kelt 5.50 sailplanKelt 5.50 layoutKelt 5.50 sailing
Kelt 5.50's   Main Features
Model Kelt 5.50
Version Lifting keel
Type of hull Monohull
Category Coastal cruising monohull
Cockpit Closed aft cockpit
Shipyard
Designer Gilles Ollier
Class Micro
Construction Hull:
monolithic fiberglass / polyester
Deck:
sandwich balsa / fiberglass / polyester
First built hull 1978
Last built hull 1982
Number of hulls built About 600
Appendages Keel (lifting) :
Keel retractable
Helm 1 tiller
Rudder 1 transom hung rudder
Unsinkable Yes
Trailerable Yes
French navigation category 5
Standard public price ex. VAT (indicative only) N/A
Kelt 5.50's   Main dimensions
Length overall 19’ 7”
Hull length 17’ 11”
Waterline length 15’ 8”
Beam (width) 7’ 11”
Waterline beam (width) 6’ 1”
Draft 3’ 7”
Draft when appendages up 0’ 10”
Mast height from DWL 27’ 6”
Fore freeboard 2’ 6”
Mid-ship freeboard 2’ 5”
Light displacement 1323 lbs
Maximum displacement 2061 lbs
Ballast weight 220 lbs
Ballast type Lead
French customs tonnage 2.78 Tx
Kelt 5.50's   Rig and sails
Upwind sail area 199 sq.ft
Downwind sail area 313 sq.ft
Mainsail area 113 sq.ft
Genoa area 85 sq.ft
Jib area 59 sq.ft
Stormjib area 31 sq.ft
Symetric spinnaker area 199 sq.ft
Rigging type Sloop Marconi 7/8
Spars Mast and boom in Aluminum
Standing rigging Continuous
Number of levels of spreaders 1
Spreaders angle Swept-back
PiMainsail hoist measurement (from tack to head) 21’ 4”
EiMainsail foot measurement (from tack to clew) 9’ 2”
Kelt 5.50's   Performances
HN (French rating) 3.0
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.
25.94
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.
40.82
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.
154
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.
17 %
Wetted surface 97 sq.ft
Maximum transverse section 4 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.
5.32 knots
Kelt 5.50's   Auxiliary engine
Engine(s) 1
Engine type Outboard engine
Kelt 5.50's   Accommodation
Berth(s) 4
Maximum headroom 4’ 7”
Kelt 5.50's   Fore cabin
Berth length 6’ 11”
Berth width 5’ 11”
Kelt 5.50's   Aft cabin
Berth length 6’ 2”
Berth width 2’

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