The Southerly 435 2017 vs Southerly 590 2017 comparison sits squarely in the category of decisions where specs alone won't tell the whole story — intended use, storage, and long-term ownership costs all factor in.
Size is the most obvious dividing line here. The Southerly 590 2017 measures 58,2 feet overall (2017), giving it roughly 16,0 additional feet of deck space compared to the Southerly 435 2017 at 42,2 feet (2017). Weight tells a clearer story for trailering families: the Southerly 590 2017 tips the scales at 76 639 lbs — 50 624 lbs less than the Southerly 435 2017 at 26 015 lbs. That difference is meaningful if you're working within a half-ton or three-quarter-ton truck's tow rating, especially once you factor in a motor, gear, and fuel.
The power gap is worth calling out. Rated to 146 hp, the Southerly 590 2017 has a 93-hp advantage over the Southerly 435 2017's 53-hp ceiling — enough to notice on acceleration and at cruising speed, particularly with a full passenger load. Fuel capacity breaks the other way: the Southerly 590 2017 carries 368 gallons versus 76 gallons in the Southerly 435 2017. On a lake day that's negligible, but for coastal cruising or long reservoir runs the extra range matters.
For family outings this is probably the sharpest distinction between the two. The Southerly 590 2017 is rated for 17 passengers, while the Southerly 435 2017 caps at 12. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Southerly 590 2017 could be the deciding factor.
Displacement is where these two sailboats genuinely part ways. The Southerly 590 2017 displaces 76 639 lbs — a 50 624-lb difference over the Southerly 435 2017 at 26 015 lbs. That gap separates two entirely different categories of sailing: the heavier boat is built for offshore passage-making and load-carrying, while the lighter hull rewards performance sailing and easier handling in lighter air.
Draft is a practical consideration that many buyers underestimate until they're already at the marina. The Southerly 590 2017 draws 10,8 ft, compared to 8,1 ft for the Southerly 435 2017. That 2,7-foot difference affects which anchorages you can access, which haul-out facilities will take you, and how carefully you need to read the tide tables in shallower cruising grounds.
The Southerly 435 2017 uses Sloop rigging. Helm style differs too: the Southerly 435 2017 uses a 1 wheel versus a 2 wheels on the Southerly 590 2017. Wheel helms give better leverage and visibility on larger boats; tillers offer direct feedback and simplicity on smaller ones. For auxiliary power the Southerly 590 2017 carries a 146-hp engine against 53 hp on the Southerly 435 2017. Motoring range and ability to punch through a foul current or enter a tight marina under power will favour the more powerful installation.
Hull speed is rated at 9,7 knots for the Southerly 590 2017 and 8,1 knots for the Southerly 435 2017.
Bottom line: The Southerly 590 2017 is the offshore and bluewater choice — at 76 639 lbs displacement and 58 ft it has the load capacity, range, and seakeeping for extended passages. The Southerly 435 2017 at 26 015 lbs is the more nimble, accessible option — easier to single-hand and better suited to coastal and inland sailing.