The Southerly 48 2020 vs Southerly 57 2020 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 57 2020 measures 58,2 feet overall (2020), giving it roughly 9,4 additional feet of deck space compared to the Southerly 48 2020 at 48,8 feet (2020). Weight tells a clearer story for trailering families: the Southerly 57 2020 tips the scales at 76 639 lbs — 38 596 lbs less than the Southerly 48 2020 at 38 043 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 57 2020 has a 66-hp advantage over the Southerly 48 2020's 80-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 57 2020 carries 368 gallons versus 107 gallons in the Southerly 48 2020. 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 57 2020 is rated for 17 passengers, while the Southerly 48 2020 caps at 14. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Southerly 57 2020 could be the deciding factor.
Displacement is where these two sailboats genuinely part ways. The Southerly 57 2020 displaces 76 639 lbs — a 38 596-lb difference over the Southerly 48 2020 at 38 043 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.
Both boats draw a similar depth — 10,2 ft and 10,8 ft respectively. Marina access and anchorage options should be broadly equivalent between the two.
The Southerly 48 2020 uses Sloop rigging. For auxiliary power the Southerly 57 2020 carries a 146-hp engine against 80 hp on the Southerly 48 2020. 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 57 2020 and 8,8 knots for the Southerly 48 2020. For extended cruising, water capacity matters: the Southerly 57 2020 carries 275 gallons versus 175 gallons on the Southerly 48 2020 — a significant advantage on longer passages where watermaker or provisioning stops aren't guaranteed.
Bottom line: The Southerly 57 2020 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 48 2020 at 38 043 lbs is the more nimble, accessible option — easier to single-hand and better suited to coastal and inland sailing.