Detailed sailboat specifications and datasheets since 2015
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RM 1270 Swing keel

Sailboat specifications

The RM 1270 is a 39’10” (12.12m) fast cruising sailboat designed by Marc Lombard Yacht Design Group (France). She is built since 2015 by Fora Marine (France) and RM yachts (France). The Swing keel version adopts an appendage configuration without compromise between draft and performance. The only drawbacks are the space taken inside and the price of the system...

The RM 1270 is as well listed, on, in Twin keel and Fin keel version (see all the versions compared).

RM 1270's main features

RM 1270
Swing keel
Hull type
Offshore fast cruising sailboat
Sailboat builder
Sailboat designer
Sailboat range
Hull and deck: plywood with glass/epoxy stratification
First built hull
Last built hull
Still in production
Lifting keel : swing keel
Twin helm wheels
Single spade rudder (twin as option)
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
Standard public price ex. VAT (indicative only)
224 000

RM 1270's main dimensions

Overall length
43’ 2”13.18 m
Hull length
39’ 10”12.12 m
Waterline length
39’ 1”11.92 m
Beam (width)
14’ 4”4.35 m
10’ 6”3.2 m
Draft when appendages up
4’ 4”1.3 m
Mast height from DWL
63’ 4”19.3 m
Light displacement (MLC)
15653 lb7100 kg
Maximum displacement (MLDC)
22046 lb10000 kg
6393 lb2900 kg
Ballast weight
4740 lb2150 kg

RM 1270's rig and sails

Upwind sail area
1066 ft²99 m²
Downwind sail area
2088 ft²194 m²
Mainsail area
527 ft²49 m²
Genoa area
538 ft²50 m²
Asymmetric spinnaker area
1561 ft²145 m²
 iFore triangle height (from mast foot to fore stay top attachment)
54’ 7”16.65 m
 iFore triangle base (from mast foot to bottom of forestay)
17’ 5”5.29 m
 iMainsail hoist measurement (from tack to head)
52’ 11”16.11 m
 iMainsail foot measurement (from tack to clew)
16’ 8”5.1 m
Rigging type
Cutter Marconi 9/10
Mast configuration
Deck stepped mast
Rotating spars
Number of levels of spreaders
Spreaders angle
Spars construction
Aluminum spars (carbon fiber spars as an option)
Standing rigging
1x19 strand wire discontinuous

RM 1270'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.
288 ft²/T26.8 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.
565 ft²/T52.52 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.
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.
30 %
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.
8.38 knots

RM 1270's auxiliary engine

1 inboard engine
Engine(s) power (min./max.)
40 HP / 55 HP
Fuel type
Fuel tank capacity
39.6 gal150 liters

RM 1270's accommodations and layout

Open aft cockpit
Cabin(s) (min./max.)
2 / 3
Berth(s) (min./max.)
4 / 8
Freshwater tank capacity
126.8 gal480 liters
Holding tank capacity
14.5 gal55 liters
Maximum headroom
6’ 5”1.96 m
Galley headroom
6’ 5”1.96 m
Head headroom
6’ 5”1.94 m

RM 1270's saloon

Maximum headroom
6’ 2”1.9 m
Saloon table length
4’ 7”1.4 m
Saloon table width (min./max.)
1’ 6”0.45 m / 4’ 5”1.35 m
Berth length
7’2.12 m
Berth width
2’ 4”0.69 m

RM 1270's fore cabin

Maximum headroom
5’ 10”1.76 m
Berth length
6’ 7”2 m
Berth width
4’ 1”1.24 m

RM 1270's aft cabin

Maximum headroom
6’ 5”1.94 m
Berth length
6’ 7”2.02 m
Berth width
5’ 2”1.6 m
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