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Sailboat specifications and datasheets

RM 1050 twin keel

The RM 1050, here in "twin keel" version, is a 34’5” monohull sailboat designed by Marc Lombard. She was built by Fora Marine (France) and made of plywood with fiberglass / epoxy with galvanised steel frame. This sailboat was produced between 1998 and 2011.

The RM 1050 belongs to the RM range.

Fora Marine RM 1050 Fora Marine RM 1050 sailplanFora Marine RM 1050 layoutFora Marine RM 1050 layoutFora Marine RM 1050 sailingFora Marine RM 1050 accommodations
RM 1050's   Main Features
Model RM 1050
Version Twin keel
Type of hull Monohull
Shipyard
Designer Marc Lombard
Range RM
Construction Hull:
Plywood with fiberglass / epoxy with galvanised steel frame
Deck:
sandwich PVC / fiberglass / polyester
First built hull 1998
Last built hull 2011
Appendages Twin keel :
Twin asymetric fin with bulb
Helm 1 tiller
Rudder 1 spade rudder
Unsinkable No
Trailerable No
EC certification A
Standard public price (indicative only) N/A
RM 1050's   Main dimensions
Length overall 34’ 10”
Hull length 34’ 5”
Waterline length 32’ 2”
Beam (width) 13’
Waterline beam (width) 9’ 10”
Draft 5’ 2”
Mast height from DWL 51’ 6”
Light displacement 9039 lbs
Maximum displacement 12125 lbs
Ballast weight 4550 lbs
Ballast type Cast iron
French customs tonnage 13.58 Tx
RM 1050's   Rig and sails
Upwind sail area 775 sq.ft
Downwind sail area 1324 sq.ft
Mainsail area 409 sq.ft
Genoa area 366 sq.ft
Jib area 172 sq.ft
Symetric spinnaker area 915 sq.ft
Rigging type Cutter Marconi masthead
Rotating spars No
Mast position Deck stepped mast
Spars Mast and boom in Aluminum
Standing rigging 1x19 strand wire
Number of levels of spreaders 2
Spreaders angle 25 °
IiFore triangle height (from mast foot to fore stay attachment) 47’ 2”
JiFore triangle base (from mast foot to bottom of forestay) 12’ 8”
PiMainsail hoist measurement (from tack to head) 41’ 7”
EiMainsail foot measurement (from tack to clew) 16’ 1”
RM 1050's   Performances
HN (French rating) 24.0
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.
28.11
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.
48.02
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.
123
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.
50 %
Prismatic coefficientiThe prismatic coefficient is obtained by dividing the volume of the boat (mass divided by the density of water) by the waterline length multiplied by the area of the maximum transverse section.
This coefficient describes the effectiveness of a sailboat for a certain speed range: lower is the coefficient (<0.45), more effective the yacht is below its hull speed; higher the coefficient is, more the boat is suitable for planning speed.
0.50
Maximum righting momentiThe righting moment is a moment (torque) that tends to restore a boat to its previous position after a rotational displacement. Its value corresponds to the torque needed to heel the boat for this angle.
Higher the righting moment is for an angle, greater is the stability at this angle.
32549 lbs.ft @ 50.00 °
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.
7.60 knots
RM 1050's   Auxiliary engine
Engine(s) 1
Engine type Inboard engine
Engine (min/max) 20 HP / 30 HP
Fuel type Diesel
Fuel tank capacity 26.4 gal
RM 1050's   Accommodation
Cabin(s) 1
Berth(s) 6
Head(s) 1
Fresh water tank capacity 179.6 gal
Chart table 3’ x 1’ 10”
Maximum headroom 6’ 1”
Galley headroom 6’
Head headroom 5’ 8”
RM 1050's   Saloon
Maximum headroom 4’ 11”
Saloon table length 4’ 5”
Saloon table width (min/max) 3’
Berth length 6’ 7”
Berth width 2’ 4”
RM 1050's   Fore cabin
Berth length 6’ 8”
Berth width (head/feet) 5’ 2”
3’
RM 1050's   Aft cabin
Maximum headroom 5’ 8”
Berth length 6’ 8”
Berth width 5’ 1”

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