HULK DEFENSEUncrewed underwater vessels

Design gallery

Exterior, deck, payload and internal views of the HD-18, generated from the engineering model that defines the vessel.

Surfaced in a seaway with the mast raised — the flat deck runs almost awash
Surfaced in a seaway with the mast raised — the flat deck runs almost awash
HD-18 trimmed down at the waterline off a commercial port, mast raised
HD-18 trimmed down at the waterline off a commercial port, mast raised
Alongside at dusk with one hatch open and the mast raised
Alongside at dusk with one hatch open and the mast raised
Trimmed down alongside at last light, one cover raised
Trimmed down alongside at last light, one cover raised
Surfaced on passage at dusk, mast raised for the snorkelling leg
Surfaced on passage at dusk, mast raised for the snorkelling leg
The three-stage mast at full extension against a harbour skyline
The three-stage mast at full extension against a harbour skyline
Bow on and submerged — the small deck radius over the deep forefoot
Bow on and submerged — the small deck radius over the deep forefoot
Submerged stern quarter — X-form control planes and twin propellers
Submerged stern quarter — X-form control planes and twin propellers
Stern on, submerged — X-form planes and twin five-blade propellers
Stern on, submerged — X-form planes and twin five-blade propellers
Stern from below — propellers, shafts and the lower plane pair
Stern from below — propellers, shafts and the lower plane pair
Submerged profile with one cover raised and the mast stowed
Submerged profile with one cover raised and the mast stowed
HD-18 quarter view — hull, planes and propellers
HD-18 quarter view — hull, planes and propellers
Port profile — 18.00 m overall, hatches flush with the deck
Port profile — 18.00 m overall, hatches flush with the deck
Bow on — small radius at the deck corner, large radius at the bilge
Bow on — small radius at the deck corner, large radius at the bilge
Bow quarter with all six hatch covers closed flush
Bow quarter with all six hatch covers closed flush
Deck plan from above — six hatches in three pairs, one pair per compartment
Deck plan from above — six hatches in three pairs, one pair per compartment
Plan view — three pairs of covers on the flat deck, mast trunk forward of the stern group
Plan view — three pairs of covers on the flat deck, mast trunk forward of the stern group
Quayside crane lifting a module clear of an open hatch pair
Quayside crane lifting a module clear of an open hatch pair
Alongside with two covers raised and modules standing proud of the deck
Alongside with two covers raised and modules standing proud of the deck
A module on its scissor lift, risen clear of the coaming through the open hatch
A module on its scissor lift, risen clear of the coaming through the open hatch
One cover raised — the stiffened underside, the coaming and the trunk below
One cover raised — the stiffened underside, the coaming and the trunk below
Hatch detail at the full 95° opening angle, gas springs extended
Hatch detail at the full 95° opening angle, gas springs extended
A payload module on its lifting frame
A payload module on its lifting frame
In build — the faired hull on its cradles with one cover raised
In build — the faired hull on its cradles with one cover raised
HD-18 on the travel lift
HD-18 on the travel lift
Loading alongside — a payload module lands on the handling jack through an open hatch pair
Loading alongside — a payload module lands on the handling jack through an open hatch pair
Alongside in the shed with a hatch pair open and two modules seated
Alongside in the shed with a hatch pair open and two modules seated
Inside a compartment — two modules on their lifts under an open hatch pair
Inside a compartment — two modules on their lifts under an open hatch pair
Longitudinal cutaway — three compartments amidships, battery forward, energy group aft
Longitudinal cutaway — three compartments amidships, battery forward, energy group aft
Ghosted isometric — compartments, trunks and tankage inside the envelope
Ghosted isometric — compartments, trunks and tankage inside the envelope
Ghosted isometric with cargo aboard — two modules per compartment
Ghosted isometric with cargo aboard — two modules per compartment
Profile cutaway — six scissor lifts in line under the six hatches
Profile cutaway — six scissor lifts in line under the six hatches
Plan cutaway — modules in the bays, wing tanks outboard, energy group aft
Plan cutaway — modules in the bays, wing tanks outboard, energy group aft
One compartment as a unit: the sealed box, two trunks, two covers
One compartment as a unit: the sealed box, two trunks, two covers
Structure only — eight section-matched ring frames carrying the compartments
Structure only — eight section-matched ring frames carrying the compartments
Forward group — bow tanks, thrusters and the forward compartment boundary
Forward group — bow tanks, thrusters and the forward compartment boundary
Inside the bow — sensor group, trim tank and the forward compartment
Inside the bow — sensor group, trim tank and the forward compartment
Stern machinery — twin traction motors, shafting and five-blade propellers
Stern machinery — twin traction motors, shafting and five-blade propellers
One compartment as a unit: pressure boundary, two hatches, two modules
One compartment as a unit: pressure boundary, two hatches, two modules
Energy compartment — LFP banks on anti-shock mounts either side of the walkway
Energy compartment — LFP banks on anti-shock mounts either side of the walkway
Machinery space — generator set, shafting and auxiliaries
Machinery space — generator set, shafting and auxiliaries
Section through the machinery space — compensated fuel, generator, twin shafts
Section through the machinery space — compensated fuel, generator, twin shafts
Ghosted stern — generator, reduction gear, shafting and propellers
Ghosted stern — generator, reduction gear, shafting and propellers
Arrangement in profile — three compartments forward of the energy and machinery group
Arrangement in profile — three compartments forward of the energy and machinery group
Ghosted isometric — six modules on their lifts above the battery and tankage
Ghosted isometric — six modules on their lifts above the battery and tankage
General arrangement, profile — three sealed compartments, six hinged hatches, battery forward, energy group aft
General arrangement, profile — three sealed compartments, six hinged hatches, battery forward, energy group aft
General arrangement, plan — six covers in three pairs, fuel and generating set aft
General arrangement, plan — six covers in three pairs, fuel and generating set aft
Midship section — R200 at the deck edge, R1,100 at the bilge, 3.40 m of flat deck
Midship section — R200 at the deck edge, R1,100 at the bilge, 3.40 m of flat deck
Transverse section at station 6.30 m, looking forward
Transverse section at station 6.30 m, looking forward
Structural arrangement — compartments, trunks, coamings and covers on the ring frames
Structural arrangement — compartments, trunks, coamings and covers on the ring frames
Eight ring frames, section-matched, 12 mm web 220 mm deep
Eight ring frames, section-matched, 12 mm web 220 mm deep
One compartment unit — the sealed box, two trunks rising to the seat, two covers flush with the deck
One compartment unit — the sealed box, two trunks rising to the seat, two covers flush with the deck
Tankage and ballast — eleven tanks with the fixed-ballast channel in the keel
Tankage and ballast — eleven tanks with the fixed-ballast channel in the keel
Sea pressure seats the cover — 66.6 t on the seat at operating depth, dogs unloaded
Sea pressure seats the cover — 66.6 t on the seat at operating depth, dogs unloaded
Pressure balance turns a 2.011 bar structural problem into a 1.00 bar one
Pressure balance turns a 2.011 bar structural problem into a 1.00 bar one
Range against speed — submerged on the battery, snorkelling on the generating set
Range against speed — submerged on the battery, snorkelling on the generating set
The twelve heaviest items of the weight statement
The twelve heaviest items of the weight statement