Stern Ramp

verified_specs: {}

application: Primary cargo access for RoRo and RoPax vessels at stern; combined watertight/weathertight axial ramp and door unit with entering and bridging flaps; hydraulically operated; designed to match vessel hull dimensions and port quay height ranges; suitable for newbuildings and conversions.

model_source: https://www.macgregor.com/Products/products/tts-products/Stern-Ramp-Door/

source: verified_depth_2026-06

source_tag: verified_depth_2026-06

needs_verification: False

verified_specs: {}

application: Stern cargo access for RoRo vessels operating on routes with large quay height variations requiring long ramp lengths; two-part folding ramp that stows vertically; can be installed on upper deck for simultaneous main-deck and upper-deck loading; inner section acts as weathertight door when closed.

model_source: https://www.macgregor.com/Products/products/tts-products/Foldable-Stern-Ramp-Door/

source: verified_depth_2026-06

source_tag: verified_depth_2026-06

needs_verification: False

verified_specs: {}

application: Wire-operated angled stern ramp offset 30–45° from vessel centerline; allows conventional quay berthing without dedicated RoRo shore facilities; primary equipment on PCTCs (Pure Car and Truck Carriers); deployed on more than 200 PCTCs.

model_source: https://www.macgregor.com/Products/products/tts-products/External-ramps/

source: verified_depth_2026-06

source_tag: verified_depth_2026-06

needs_verification: False

verified_specs: {}

application: Stern ramp capable of slewing up to approximately 40° port or starboard of vessel centerline; allows loading/unloading both stern-to and alongside; ultimate RoRo berthing versatility; suitable for multipurpose and RoRo vessels.

model_source: https://www.yumpu.com/en/document/view/4519471/slewing-ramps-marine-tts-group-asa

source: verified_depth_2026-06

source_tag: verified_depth_2026-06

needs_verification: False

verified_specs: {'radius_m': 50.5, 'SWL_t': 350}

application: Extra-large angled stern quarter ramp for post-Panamax ConRo vessels (RoRo/containership); four vessels of the Jolly Diamante class built at DSME, South Korea, delivered 2012; supplied with top-hinged watertight stern door, rampway doors, ramp covers, division doors, power packs and electrical systems.

model_source: https://www.offshore-energy.biz/messina-lines-conro-vessel-gets-state-of-the-art-macgregor-systems/

source: verified_depth_2026-06

source_tag: verified_depth_2026-06

needs_verification: False

verified_specs: {'SWL_t': 400, 'radius_m': 14, 'weight_kg': 72000}

application: Fully electric stern ramp/door with no hydraulic components; operated by electric winches, electric cleating cylinders and electric launching rod; PLC-controlled via remote panels; delivered by TTS Marine AB (Gothenburg) for specialized nuclear-fuel transport vessel built by Damen Shipyards, delivered June 2013 to SKB (Swedish Nuclear Fuel and Waste Management Co).

model_source: https://www.offshore-energy.biz/tts-equipment-onboard-specialized-ro-ro-vessel-sigrid/

source: verified_depth_2026-06

source_tag: verified_depth_2026-06

needs_verification: False

verified_specs: {'SWL_t': 500, 'radius_m': 16}

application: Standard axial straight stern ramp/door for RoRo and RoPax ferries; length chosen to match tidal variation and quay type (conventional quay, RoRo berth, or linkspan); PLC-operated; hydraulic cylinders repositionable to lower ramp onto different quay configurations; used on cable-repair and utility RoRo vessels among others.

model_source: https://www.offshore-mag.com/business-briefs/equipment-engineering/article/16780512/macgregor-delivers-stern-ramp-solution

source: verified_depth_2026-06

source_tag: verified_depth_2026-06

needs_verification: False

verified_specs: {'drive': 'Hydraulic cylinders (up to ~250 m² ramp area) or hydraulic/electric wire-rope winch motors (>250 m²)', 'notes': 'Custom-engineered to vessel dimensions and quay-height range; no fixed model dimensions published in open datasheets'}

application: Primary cargo access for RoRo vessels (ferries, RoPax, PCTC, deepsea RoRo) berthing at conventional quays or RoRo terminals. Ramp built in one section, hinged at the lower end of the stern threshold deck; doubles as a watertight door. Operated by hydraulic cylinders (ramps up to ~250 m²) or wire rope/hydraulic-electric winch motors (larger ramps). Fitted with hinged shore flaps and bridge plates.

model_source: https://www.macgregor.com/Products/products/tts-products/Stern-Ramp-Door/

source: verified_depth_2026-06

source_tag: verified_depth_2026-06

needs_verification: False

verified_specs: {'sections': '2 main articulated sections plus outer and inner flaps', 'drive': 'Hydraulic (standard); electric drive available', 'notes': 'No fixed model dimensions published in open datasheets; dimensions custom-engineered to vessel'}

application: RoRo vessels operating routes with large tidal variations or quays with considerable height differences, where a long ramp length would cause stowage problems in a single-section design. Can also be installed on an upper deck for simultaneous two-deck loading. Comprises two main sections articulated together, with outer and inner flaps; inner section acts as a weathertight door secured by hydraulically-operated cleats.

model_source: https://www.macgregor.com/Products/products/tts-products/Foldable-Stern-Ramp-Door/

source: verified_depth_2026-06

source_tag: verified_depth_2026-06

needs_verification: False

verified_specs: {'angle_to_centreline_deg': '30–40', 'sections': '3 articulated', 'example_length_m': 46.5, 'example_width_m': 12, 'example_SWL_t': 250, 'drive': 'Hydraulic or all-electric'}

application: PCTC (Pure Car and Truck Carriers), deepsea RoRo, and general RoRo vessels that berth at conventional quays without dedicated RoRo arrangements. Arranged at 30–40° angle to the vessel's centreline (normally starboard side; port available). Divided into three articulated sections to accommodate specified range of quay heights. Handles cars, trucks, trailers, high-and-heavy and project cargo. First MacGregor quarter ramp delivered 1956.

model_source: https://www.macgregor.com/Products/products/tts-products/Quarter-Ramp/

source: verified_depth_2026-06

source_tag: verified_depth_2026-06

needs_verification: False

verified_specs: {'slewing_angle_deg': 'up to 35–40 either side of centreline', 'example_length_ft': 59, 'notes': 'No SWL or weight data published in accessible open sources for this series'}

application: Multipurpose RoRo cargo ships requiring flexibility to berth stern-to at a dedicated RoRo pier or at an angle off the centreline (up to ~35–40° to either side). Documented on 12,800-dwt 'Multiflex' multipurpose vessels (Hamlet Shipping, 1977) and 14,300-dwt RoRo vessels with full slewing capacity either side of centreline.

model_source: https://magazines.marinelink.com/Magazines/MaritimeReporter/197703/content/macgregor-slewing-multiflex-209494

source: verified_depth_2026-06

source_tag: verified_depth_2026-06

needs_verification: False

verified_specs: {'SWL_t': 500, 'length_m': 16, 'max_opening_breadth_m': 12, 'clear_opening_height_m': 10, 'sections': 'Two-part construction with 4 hinged sections', 'drive': 'Hydraulic cylinders with PLC control sequence'}

application: Newbuild cable-repair / offshore support vessel Elektron (Statnett, Norway). Non-standard configuration: ramp lowers onto deck via repositionable hydraulic cylinders rather than vertical stowage; outer sections operable individually to accommodate varying quay configurations.

model_source: https://www.offshore-mag.com/business-briefs/equipment-engineering/article/16780512/macgregor-delivers-stern-ramp-solution

source: verified_depth_2026-06

source_tag: verified_depth_2026-06

needs_verification: False

verified_specs: {'length_m': 49.6, 'width_m': 12, 'SWL_t': 400}

application: Three-deck deepsea RoRo newbuilding Nedlloyd Rouen. Designed to span a 25-metre stern opening; separate stern door closes the opening. Supports three-lane traffic flow. Identical unit fitted on sister ship.

model_source: https://trid.trb.org/View/87757

source: verified_depth_2026-06

source_tag: verified_depth_2026-06

needs_verification: False

verified_specs: {}

application: ROPAX, Car Ferry, RoRo cargo ships — stern access for vehicle roll-on/roll-off; two-part system (main ramp + folding flap) acting as watertight door when closed; used on PCTC vessels simultaneously or alternately with side ramps for loading/unloading of thousands of vehicles

model_source: https://sms-sme.com/sub2-1.php

source: verified_depth_2026-06

source_tag: verified_depth_2026-06

needs_verification: False

verified_specs: {}

application: ROPAX, Car Ferry, PCTC — quarter-stern vehicle access ramp; three-part system (main section, folding section, flap); hydraulic cylinder adjusts tilt angle to quay height; auto-tension function reduces pier pressure

model_source: https://sms-sme.com/sub2-1.php

source: verified_depth_2026-06

source_tag: verified_depth_2026-06

needs_verification: False

verified_specs: {}

application: PCTC (Pure Car/Truck Carrier), RoRo vessels — side-shell vehicle access at deck levels 1, 2, or 3; level adjusted by jigger winch; enables loading regardless of ship draft or quay height

model_source: https://sms-sme.com/sub2-1.php

source: verified_depth_2026-06

source_tag: verified_depth_2026-06

needs_verification: False

verified_specs: {'length_m': 9.3, 'beam_m': 15.3, 'capacity_t': 25}

application: Navy amphibious vessels (LPD, LST) — submergible stern ramp/door operable underwater to allow boat entry into vessel; serves as vehicle ramp on shore

model_source: https://sms-sme.com/sub2-4.php

source: verified_depth_2026-06

source_tag: verified_depth_2026-06

needs_verification: False

verified_specs: {'width_m': 41.6, 'height_m': 8.5, 'weight_kg': 170000}

application: Semi-submersible yacht carrier (Y-type vessel, e.g. Spliethoff YACHT SERVANT) — world's largest stern door; full-height submersible door for yacht sail-in; provides fully enclosed hold

model_source: https://sms-sme.com/sub2-4.php

source: verified_depth_2026-06

source_tag: verified_depth_2026-06

needs_verification: False

verified_specs: {}

application: RoRo stern ramp for ferries and naval vessels; loading/unloading of trailers, cars, and passengers; folding type, built in two sections with flaps, open girder frame or closed box design; hydraulic HPP-powered with wire ropes; EPDM gasket water tightness; Class society approved

model_source: https://www.nauticexpo.com/prod/seanet-group/product-64983-480907.html

source: verified_depth_2026-06

source_tag: verified_depth_2026-06

needs_verification: False

verified_specs: {}

application: Stern ramp for RoRo ferries and naval vessels; stern and side ramp variants; folding or single-section design; customised to vessel dimensions and quay heights; powered by hydraulic power pack (HPP) and steel wires; hydraulic clamp locking in stowed position

model_source: http://www.seanetgroup.ch/eng/prodotti-C39-13.html

source: verified_depth_2026-06

source_tag: verified_depth_2026-06

needs_verification: False

verified_specs: {}

application: Stern and side ramps for RoRo ferries, Ro-Pax vessels, mega-yachts and military vessels; custom-engineered per vessel; loading/unloading of vehicles, trailers, trucks and passengers; designed and manufactured to Class society rules and requirements

model_source: https://www.sems-srl.com/eng/prodotti-C41-13.html

source: verified_depth_2026-06

source_tag: verified_depth_2026-06

needs_verification: False

verified_specs: {'capacity_kg': 10250, 'motion_range_deg': 15, 'deployment_time_s': 60, 'operating_height_clearance_ft': 6.5, 'note': 'Provides positive buoyancy when operated'}

application: Integral part of the stern door and ramp system on Littoral Combat Ships (LCS); enables launch and recovery of mission packages, RHIBs, and unmanned vehicles from the stern while underway.

model_source: https://www.lakeshoresys.com/marine-and-defense/ramps/

source: verified_depth_2026-06

source_tag: verified_depth_2026-06

needs_verification: False

verified_specs: {'construction': 'Hydraulically powered aluminum, bi-folding', 'slewing_range': 'Dead astern to 45 degrees toward starboard', 'design_load': 'M1A2 Abrams MBT and fully loaded M1070 Military Truck with Trailer'}

application: Hydraulically powered bi-folding aluminum stern ramp on T-EPF (Spearhead-class) vessels for RoRo on/off-load capability; interfaces with Roll-on/Roll-off Discharge Facilities, piers, quay walls, and austere locations.

model_source: https://www.lakeshoresys.com/marine-and-defense/ramps/

source: verified_depth_2026-06

source_tag: verified_depth_2026-06

needs_verification: False

verified_specs: {}

application: RoRo stern cargo access for ferries, LCTCs (Large Car & Truck Carriers) and deepsea RoRo vessels; enables loading/unloading of cars, trucks, trailers, high-and-heavy and special project cargo; ramp arranged at 30–40° to vessel centreline, allowing berthing at conventional quays without dedicated RoRo infrastructure; can double as watertight door in closed position; normally built in three hinged sections with shore flaps and internal bridge plates for smooth vehicle transition.

model_source: https://smecoffshore.com/quarter-ramp-door

source: verified_depth_2026-06

source_tag: verified_depth_2026-06

needs_verification: False