Aleutian 70, Global Surveyor

World tested cruising comfort, hurricane tested steel strength.

This vessel is designed to sail to areas which lack any rescue cover. Self sufficiency and safety were prime considerations in the design concept, thus;

Steel construction was chosen because of its great strength, reliability, adaptability, reparability, longevity and economy. It is the first choice of many experienced "Blue Water Sailors"

The vessel has been computer designed, enabling the hull to be easily and quickly built ( approx 2,000 man hours ) from a flat pack kit, of shot blasted and primed, submerged plasma cut steel. These parts are accurately profiled to +- 1 mm for immediate use. The profiled shapes include locating tabs and slots. The vessel can thus be quickly and accurately built by anyone having the necessary welding skills.

The plating is generally 1 to 2 mm thicker than would normally be expected on a vessel of this size. The main framing is close spaced for strength and transverse to allow condensation run off. It is "eggboxed" with four longitudinal deck girders and two heavy bottom girders, spaced to accommodate the engine room and water and diesel tankage. This gives a fairer hull with massive strength and longevity. This heavy duty construction makes the hull approximately 50% stronger than "normal", while adding only 7% to the final displacement.

The keel base is 25 mm, and the sides 10 mm. The bilge ( where a vessel would lie over when grounded ) and bottom plates are 7 mm to 150 mm above the waterline. The crew of this vessel are not playing Russian roulette with semi submerged containers, whales and tree trunks. These thicknesses also provide security in the event of an inadvertent grounding while exploring uncharted areas.

The topsides and deck ring are 6 mm to minimise possible collision damage and to allow the vessel to safely rub shoulders with fishing fleets in port. The rest of the deck is 5 mm to support deck cargo and minimise distortion.

The wheel-shelter is of 4mm and 3 mm plate. ( The wheel-shelter has large windows and is not necessary to the watertight integrity of the hull )

Five transverse WT bulkheads provide fire breaks and divide the accommodation into fully watertight compartments. The vessel will float when any single and in some circumstances two adjacent compartments are flooded.

There are only two skin fittings below the waterline and these are fitted with standpipes. The main deck hatches are on the centerline.

Corrosion. All plates are shot blasted and weld primed before cutting. As far as possible all parts of the vessel are easily inspectable. The frames are transverse reducing water traps. Deck and cockpit edges and other wear points are lined with stainless steel. Water traps on deck are minimised. A complete marine paint system is used with foam on the inside of the hull to eliminate condensation.
Global Surveyor