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Sailboat specifications and datasheets

Kelt 8.50 centerboard (Trunk)

The Kelt 8.50, here in "centerboard (Trunk)" version, is a 27’11” monohull sailboat designed by Gilles Vaton. She was built by Kelt (France) and made of monolithic fiberglass / polyester. This sailboat was produced between 1983 and 1996 with about 600 hulls completed.
Kelt 8.50 Kelt 8.50 layoutKelt 8.50 sailing
Kelt 8.50's   Main Features
Model Kelt 8.50
Version Centerboard (Trunk)
Type of hull Monohull
Shipyard
Designer Gilles Vaton
Construction Hull:
monolithic fiberglass / polyester
Deck:
sandwich balsa / fiberglass / polyester
First built hull 1983
Last built hull 1996
Number of hulls built About 600
Appendages Centerboard
Helm 1 tiller
Rudder 1 semi-spade rudder
Unsinkable No
Trailerable No
French navigation category 2
Standard public price (indicative only) N/A
Kelt 8.50's   Main dimensions
Hull length 27’ 11”
Waterline length 24’ 7”
Beam (width) 10’ 2”
Draft 2’ 1”
Draft when appendages up 5’ 11”
Light displacement 7055 lbs
Ballast weight 3307 lbs
Ballast type Cast iron interior ballast with steel centerboard
French customs tonnage 7.15 Tx
Kelt 8.50's   Rig and sails
Upwind sail area 484 sq.ft
Downwind sail area 883 sq.ft
Mainsail area 205 sq.ft
Genoa area 280 sq.ft
Solent area 196 sq.ft
Jib area 158 sq.ft
Stormjib area 39 sq.ft
Symetric spinnaker area 678 sq.ft
Rigging type Sloop Marconi 9/10
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) 34’ 10”
JiFore triangle base (from mast foot to bottom of forestay) 10’ 4”
PiMainsail hoist measurement (from tack to head) 33’ 6”
EiMainsail foot measurement (from tack to clew) 9’ 11”
Kelt 8.50's   Performances
HN (French rating) 17.0
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.
20.72
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.
37.76
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.
215
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.
47 %
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.
6.65 knots
Kelt 8.50's   Auxiliary engine
Engine(s) 1
Engine type Inboard engine
Engine (min/max) 8 HP / 15 HP
Fuel type Diesel
Fuel tank capacity 6.6 gal
Kelt 8.50's   Accommodation
Cabin(s) 1
Berth(s) 6
Head(s) 1
Fresh water tank capacity 39.6 gal
Fridge/ice-box capacity 23.8 gal
Maximum headroom 5’ 11”
Galley headroom 5’ 11”
Head headroom 5’ 7”
Kelt 8.50's   Saloon
Maximum headroom 5’ 10”
Saloon table length 2’ 8”
Saloon table width (min/max) 2’ 7” / 3’ 2”
Saloon width (min/max) 6’ 1” / 7’ 6”
Berth length 6’ 6”
Berth width (head/elbows/knees/feet) 1’ 10”
1’ 7”
1’ 2”
Kelt 8.50's   Fore cabin
Berth length 6’ 7”
Berth width (head/elbows/knees/feet) 5’ 11”
4’ 11”
3’ 4”
1’ 7”
Kelt 8.50's   Aft cabin
Maximum headroom 5’ 7”
Berth length 5’ 11”
Berth width (head/elbows/knees/feet) 5’ 2”
4’ 6”
3’ 6”

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