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Rhumb Runner

Jönsson Ligaen-Sailing towards distant coasts

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The ship

Rhumb Runner

The name of the sailing yacht is Rhumb Runner and this basically means compas-course runner in layman terms. In English, a “Rhumb line” is the same as a course line and such a course line is used if you are constantly heading in a given course direction, for example a heading of 280. On a world globus, such a WNW heading line will correspond to a spiral line that spirales towards the North Pole. A Rhumb line (straight line) that is set out in a nautical chart is not the quickest route between two points, but a great circle route will be. However the influence is small when sailing with the trade winds arround equator.

French boat type

The ship is a Super Maramu 2000 from the French shipyard Chantier AMEL. The hull is 53 feet long, corresponding to 16 m, has a beam (width) of 4.60 m and a draft (depth) of approx. 2.10 m. The ship’s deck and interior is fantastically illustrated by the eksplodered drawing prepared by the AMEL shipyard.

Exploded view of Super Maramu 2000, AMEL 53
Exploadated drawing of a Super Maramu 2000

A ketch

Side view of Super Maramu 2000, AMEL 53
The helm located behind the mizzen mast.

Rhumb Runner is a ketch, since the lower mizzen mast, as seen in the drawings, is located in front of the rudder. The main mast is rigged with a mast head genoa. The ships hull is built in fiberglass reinforced polyester and has balsa wood as sandwich material in the deck. The deck and lower hull are assembled by fiberglassing the connection and the hull is thus very rigid and can be considered a monolithic shell. The ship has fin keel with a ballast-wing of iron and a rudder mounted on a strong skeg. The skeg protects the rudder while providing a steady heading through the water, which is nice when you sailing long distance, but of course it gives a little less manoeuvrability in port and narrow anchorages. However, the ship has an effective bowthruster which can be lowered when needed. The ship is equipped with a 100HK Yanmar diesel engine and a C drive.

Layout

Interior layout of Super Maramu 2000, AMEL 53
Interior layout
Section through Super Maramu 2000, AMEL 53, Rhumb Runner
Cross-section showing locker space, bilge, water tank, anchor well, etc.
CE-marking of Rhumb Runner
CE Marking, category A, 8 pers, 3 ton loading capacity

In Rhumb Runner there are 7 fixed bunks. The ship is CE-marked and classified for Ocean sailing, category A, with up to 8 persons on board and with a maximum payload of 3 tons. The ship has forward and aft cabin, as well as a large saloon with a navigation space, U-kitchen and U-sofa with a fixed table. There are two heads (toilets) with a shower located in connection with the forward and aft cabins. There are handrails everywhere, so that you can brace yourself at sea. The ship has a well protected central cockpit with a small hardtop and a forward placed helm. The coclpit is located in front of the mizzen mast.

Super Maramu 2000 Cockpit
Super Maramu 2000 cockpit

The ship’s anchor well and aft locker have waterproof bulkheads. In addition, the engine compartment is waterproof with an access hatch in the cockpit. The ship’s diesel tank is placed slightly to starboard in the engine compartment. Fore and aft cabin also have watertight bulkheads, if doors and pipe valves are closed. For electrical power generation there is a separate diesel engine/generator, which is also located in the engine compartment. At the stern there is stainless steel gantry carrying solar panels and with the possibility of hanging the RIB – an inflatable dingy with a hard bottom and 8 hp outboard engine. As mentioned, at the bow there is an electric bow thruster, which can be lowered. Main sail and genua are furled sails which can be operated electrically and in case of malfunction also manually. The Mizzen sail is operated manually from the cockpit. A ketch has relatively low positioned sail centre compared to similar Bermuda rigged sailing yachts, making the ship more stable.

Specification

Shipyard:AMEL Chan Tier, FranceType:Super Maramu 2000
Design:Henry Amel & J. CarteauHull, Series No.:464, FRAMLSM464J405
Year2005CE Category:A – Ocean, 8 pers, 3000kg
Hull type:Mono hullRig:Masthead, ketch
Keel:Fin keel with wingRudder type:Rudder on skeg
Keel materialIronHull materialGlass fiber reinforced polyester
Cockpit:Central cockpitHelm:Steering wheel (cable)
Master & Bomme:Aluminum, white paintedMaste Location:Deck stepped mast

Characteristics data

Length Over All (LOA):15.86 mLength of Waterline (LWL)12.50 m
Beam (Width) 4.60 mBeam at Waterline (BWL)4.10 m
Depth (DM)2.07 mWaterline Area (AWL)35 m2
Weight (LW)14440 kgDeadweight (D. W)3000 kg
Displacement17440 kgBallast/Keel weight5500 kg
Mast height20.2 mEngineYANMAR 100 HK
Fuel Tank600 LTRWater tank1000 LTR
Hull speed8.62 ktsSpeed at 2000 RPM6.4 kts
Genua/Head sail71 m2Ballooner Sail68 m2
Main sail35 m2Fok/staysail20 m2
Mizzen sail19 m2Mizzen-Staysail35 m2
Headroom2 mNumber of bunks7
Toilet/bath Room2 pcsWatermaker50 Ltr/h
Holdingtank2×40 LTRStove fuelGas
BT = Gross Tonnage21.4NT = Net Tonnage6.4
Anchor chain length100 mAnchor45 kg (Rockna)

Polar diagram

Polar diagram for Super Maramu 2000

There are some Super Maramu 2000 skippers who have prepared a polar diagram which expresses the sailing speed (in knots) as a function of the true wind speed (in knots) and the true wind angle. The Polar diagram is reproduced here.

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    Jeppe

    As skipper I have both ocean and coastal yachtmaster certificate. I have always sailed and have extensive knowledge of sailing, yachts, maintenance and technical stuff.

    Jeppe: View My Blog Posts

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    As skippers wife I have the coastal yachtmaster certificate. I keep a log of everyday life and experiences on trips. I'm interested in history and culture.

    Kirsten Halmø: View My Blog Posts

    Mette

    I am a crew member on board Rhumb Runner and I have extensive experience as a sea scout. I play football and love craftwork and design.

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