Dehler 29 Shoal draft

Sailboat specifications

The Dehler 29 is a 28’8” (8.75m) cruiser-racer sailboat designed by Judel/Vrolijk (Germany). She is built since 1997 by Dehler (Germany) with 141 hulls completed. The Shoal draft version features a shorter keel to grant access to shallow areas.

The Dehler 29 is as well listed, on Boat-Specs.com, in Standard and Race version (see all the versions compared).

Dehler 29's main features

Model: Dehler 29
Version: Shoal draft
Hull type: Monohull
Category: Cruiser-racer sailboat
Sailboat builder: Dehler
Sailboat designer: Judel/Vrolijk
Country: Germany
Construction: GRP (glass reinforced polyester):
- Hull: Single skin fiberglass polyester
- Deck: Sandwich balsa fiberglass polyester
Number of hulls built: 141
First built hull: 1997
Last built hull: Still in production
Appendages: Keel : L-shaped keel (with bulb)
Helm: Single tiller
Rudder: Single spade rudder
Unsinkable: No
Trailerable: No
EC design category iThe CE design category indicates the ability to cope with certain weather conditions (the sailboat is designed for these conditions) A: Wind < force 9, Waves < 10m B: Wind < force 8, Waves < 8m C: Wind < force 6, Waves < 4m D: Wind < force 4, Waves < 0,5m: B
Standard public price ex. VAT (indicative only): About
75 500 €
(2020)

Dehler 29's main dimensions

Overall length: 28’ 8”8.75 m
Hull length: 28’ 8”8.75 m
Waterline length: 26’ 2”8 m
Beam (width): 9’ 10”2.99 m
Draft: 4’1.22 m
Mast height from D_WL: 46’ 1”14.05 m
Light displacement (M_LC): 6945 lb3150 kg
Ballast weight: 2800 lb1270 kg
Ballast type: Cast iron
French customs tonnage: 8.52 Tx

Dehler 29's rig and sails

Upwind sail area: 549 ft²51 m²
Downwind sail area: 926 ft²86 m²
Mainsail area: 280 ft²26 m²
Genoa area: 269 ft²25 m²
Jib area: 183 ft²17 m²
Symmetric spinnaker area: 646 ft²60 m²
Gennaker area: 496 ft²46.1 m²
I iFore triangle height (from mast foot to fore stay top attachment): 36’ 11”11.25 m
J iFore triangle base (from mast foot to bottom of forestay): 10’ 4”3.15 m
P iMainsail hoist measurement (from tack to head): 36’ 1”11 m
E iMainsail foot measurement (from tack to clew): 13’ 1”4 m
Rigging type: Sloop Marconi 9/10
Mast configuration: Keel stepped mast
Rotating spars: No
Number of levels of spreaders: 2
Spreaders angle: Swept-back
Spars construction: Aluminum spars
Standing rigging: 1x19 strand wire

Dehler 29's performances

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.: 255 ft²/T23.73 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.: 431 ft²/T40.02 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.: 174
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.: 36 %
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.: 6.87 knots