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Sailboat specifications and datasheets

RM 890 twin keel

The RM 890, here in "twin keel" version, is a 29’2” monohull sailboat designed by Marc Lombard. She was built by Fora Marine (France) and made of plywood with fiberglass / epoxy with galvanised steel frame. The production started in 2013 .

The RM 890 belongs to the RM range. The RM 890 is as well listed, on Boat-Specs.com, in version Fin keel.

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RM 890's   Main Features
Model RM 890
Version Twin keel
Type of hull Monohull
Category Fast cruising sailboat
Shipyard
Designer Marc Lombard
Range RM
Construction Hull:
Plywood with fiberglass / epoxy with galvanised steel frame
Deck:
sandwich PVC / fiberglass / polyester
First built hull 2013
Last built hull Still in production
Appendages Twin keel :
Twin asymetric fin with bulb
Helm 1 tiller
Rudder 1 spade rudder (Double as option)
Cockpit Open aft cockpit
Unsinkable No
Trailerable No
EC certification B
Standard public price ex. VAT (indicative only) About
83 000
(2017)
RM 890's   Main dimensions
Hull length 29’ 2”
Waterline length 28’ 11”
Beam (width) 11’ 2”
Draft 4’ 11”
Mast height from DWL 45’ 11”
Light displacement 7055 lbs
Maximum displacement 9259 lbs
Capacity 2205 lbs
Ballast weight 2094 lbs
RM 890's   Rig and sails
Upwind sail area 538 sq.ft
Downwind sail area 1238 sq.ft
Mainsail area 269 sq.ft
Genoa area 269 sq.ft
Staysail area 151 sq.ft
Asymetric spinnaker area 969 sq.ft
Rigging type Sloop Marconi 9/10
Rotating spars No
Mast position Deck stepped mast
Spars Mast and boom in Aluminum (carbon fiber as an option)
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) 40’ 1”
JiFore triangle base (from mast foot to bottom of forestay) 11’ 7”
PiMainsail hoist measurement (from tack to head) 37’ 1”
EiMainsail foot measurement (from tack to clew) 12’ 6”
RM 890's   Performances
HN (French rating) 21.0
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.
23.03
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.
52.96
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.
133
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 %
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.
7.20 knots
RM 890's   Auxiliary engine
Engine(s) 1
Engine type Inboard engine
Engine (min/max) 12 HP / 20 HP
Fuel type Diesel
Fuel tank capacity 15.9 gal
RM 890's   Accommodation
Cabin(s) 2
Berth(s) (min/max) 4 / 6
Head(s) 1
Fresh water tank capacity 31.7 gal
Chart table 2’ 5” x 1’ 7”
Galley headroom 5’ 5”
RM 890's   Saloon
Maximum headroom 5’ 10”
Saloon table length 4’ 5”
Saloon table width 3’ 4”
Berth length 6’ 7”
Berth width 2’ 7”
RM 890's   Fore cabin
Berth length 6’ 2”
Berth width (head/feet) 5’ 11”
2’ 1”
RM 890's   Aft cabin
Berth length 6’ 7”
Berth width (head/feet) 3’ 10”
3’ 4”

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