Detailed sailboat specifications and datasheets since 2015
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Kelt 8.50 Centerboard (Trunk)

Sailboat specifications

The Kelt 8.50 is a 27’11” (8.5m) cruising sailboat designed by Vaton Design (France). She was built between 1983 and 1996 by Kelt (France). The Centerboard (Trunk) version grants a minimal draft when the centerboard is lifted allowing beaching and easy access to shallow areas.

Kelt 8.50's main features

Model
Kelt 8.50
Version
Centerboard (Trunk)
Hull type
Monohull
Category
Cruising sailboat
Sailboat builder
Sailboat designer
Country
France
Construction
GRP (glass reinforced polyester):
- Hull: Single skin fiberglass polyester
- Deck: Sandwich balsa fiberglass polyester
Number of hulls built
About 600
First built hull
1983
Last built hull
1996
Appendages
Centerboard : pivoting centerboard
Helm
Single tiller
Rudder
Single semi-spade rudder
Unsinkable
No
Trailerable
No
Former French navigation category
2
Standard public price ex. VAT (indicative only)
N/A

Kelt 8.50's main dimensions

Hull length
27’ 11”8.5 m
Waterline length
24’ 7”7.5 m
Beam (width)
10’ 2”3.1 m
Draft
2’ 1”0.65 m
Draft when appendages up
5’ 11”1.8 m
Light displacement (MLC)
7055 lb3200 kg
Ballast weight
3307 lb1500 kg
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 ft²45 m²
Downwind sail area
883 ft²82 m²
Mainsail area
205 ft²19 m²
Genoa area
280 ft²26 m²
Solent area
196 ft²18.2 m²
Jib area
158 ft²14.7 m²
Stormjib area
39 ft²3.65 m²
Symmetric spinnaker area
678 ft²63 m²
I
 iFore triangle height (from mast foot to fore stay top attachment)
34’ 10”10.61 m
J
 iFore triangle base (from mast foot to bottom of forestay)
10’ 4”3.14 m
P
 iMainsail hoist measurement (from tack to head)
33’ 6”10.21 m
E
 iMainsail foot measurement (from tack to clew)
9’ 11”3.02 m
Rigging type
Sloop Marconi 9/10
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

Kelt 8.50'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.
17.0
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.
223 ft²/T20.72 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.
406 ft²/T37.76 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.
215
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.
47 %
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.
6.65 knots

Kelt 8.50's auxiliary engine

Engine(s)
1 inboard engine
Engine(s) power (min./max.)
8 HP / 15 HP
Fuel type
Diesel
Fuel tank capacity
6.6 gal25 liters

Kelt 8.50's accommodations and layout

Cockpit
Closed aft cockpit
Cabin(s)
1
Berth(s)
6
Head(s)
1
Freshwater tank capacity
39.6 gal150 liters
Fridge/ice-box capacity
23.8 gal90 liters
Maximum headroom
5’ 11”1.8 m
Galley headroom
5’ 11”1.79 m
Head headroom
5’ 7”1.71 m

Kelt 8.50's saloon

Maximum headroom
5’ 10”1.78 m
Saloon table length
2’ 8”0.82 m
Saloon table width (min./max.)
2’ 7”0.79 m / 3’ 2”0.99 m
Saloon width (min./max.)
6’ 1”1.85 m / 7’ 6”2.3 m
Berth length
6’ 6”1.97 m
Berth width (head/elbows/knees/feet)
1’ 10”0.56 m / 1’ 10”0.55 m / 1’ 7”0.48 m / 1’ 2”0.38 m

Kelt 8.50's aft cabin

Berth length
6’ 7”2 m
Berth width (head/elbows/knees/feet)
5’ 11”1.8 m / 4’ 11”1.5 m / 3’ 4”1 m / 1’ 7”0.48 m

Kelt 8.50's fore cabin

Maximum headroom
5’ 7”1.71 m
Berth length
5’ 11”1.79 m
Berth width (head/elbows/knees/feet)
5’ 2”1.58 m / 5’ 2”1.57 m / 4’ 6”1.38 m / 3’ 6”1.07 m
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