RM 1370 Twin keel

Sailboat specifications

The RM 1370 is a 44’11” (13.68m) fast cruising sailboat designed by Marc Lombard Yacht Design Group (France). She is built since 2017 by Fora Marine (France) and RM yachts (France). The Twin keel version allows a shallower draft while maintaining performance thanks to the asymmetric fins with bulb. As a bonus beaching becomes easy and stable.

The RM 1370 is as well listed, on Boat-Specs.com, in Fin keel and Swing keel version (see all the versions compared).

Find out more about the RM 1370 on Boat-Spec's blog: New sailboats 2017 - France 1/2.

RM 1370's main features

Model: RM 1370
Version: Twin keel
Hull type: Monohull
Category: Offshore fast cruising sailboat
Sailboat builder: Fora Marine
&
RM yachts
Sailboat designer: Marc Lombard Yacht Design Group
Sailboat range: RM
Country: France
Construction: Hull and deck: plywood with glass/epoxy stratification
First built hull: 2017
Last built hull: Still in production
Appendages: Twin keel : twin asymmetric fin with bulb
Helm: Twin helm wheels
Rudder: Single spade rudder (twin as option)
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: A
Standard public price ex. VAT (indicative only): About
310 000 €
(2020)

RM 1370's main dimensions

Overall length: 48’ 5”14.74 m
Hull length: 44’ 11”13.68 m
Waterline length: 42’ 8”13 m
Beam (width): 14’ 10”4.5 m
Draft: 6’ 5”1.95 m
Mast height from D_WL: 67’ 4”20.51 m
Light displacement (M_LC): 21612 lb9803 kg
Maximum displacement (M_LDC): 29183 lb13237 kg
Capacity: 7571 lb3434 kg
Ballast weight: 6614 lb3000 kg

RM 1370's rig and sails

Upwind sail area: 1259 ft²117 m²
Downwind sail area: 2470 ft²229.5 m²
Mainsail area: 587 ft²54.5 m²
Genoa area: 673 ft²62.5 m²
Staysail area: 307 ft²28.5 m²
Asymmetric spinnaker area: 1884 ft²175 m²
Rigging type: Cutter Marconi 9/10
Mast configuration: Deck stepped mast
Rotating spars: No
Number of levels of spreaders: 2
Spreaders angle: Swept-back
Spars construction: Aluminum spars
Standing rigging: 1x19 strand wire discontinuous

RM 1370'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.: 275 ft²/T25.54 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.: 539 ft²/T50.1 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.: 126
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.: 31 %
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.: 8.75 knots