The Beneteau First 36S7 1995 vs Beneteau First 51 1986 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 Beneteau First 51 1986 measures 51,4 feet overall (1986), giving it roughly 16,3 additional feet of deck space compared to the Beneteau First 36S7 1995 at 35,1 feet (1995). Weight tells a clearer story for trailering families: the Beneteau First 51 1986 tips the scales at 28 660 lbs - 15 873 lbs less than the Beneteau First 36S7 1995 at 12 787 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 Beneteau First 51 1986 tops out at 80 hp. Engine specs for the Beneteau First 36S7 1995 aren't listed - confirm with a dealer before selecting an outboard.Fuel capacity breaks the other way: the Beneteau First 51 1986 carries 185 gallons versus 24 gallons in the Beneteau First 36S7 1995. 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 Beneteau First 51 1986 is rated for 15 passengers, while the Beneteau First 36S7 1995 caps at 10. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Beneteau First 51 1986 could be the deciding factor.
Displacement is where these two sailboats genuinely part ways. The Beneteau First 51 1986 displaces 28 660 lbs - a 15 873-lb difference over the Beneteau First 36S7 1995 at 12 787 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 Beneteau First 51 1986 draws 9,2 ft, compared to 6,1 ft for the Beneteau First 36S7 1995. That 3,1-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 Beneteau First 36S7 1995 uses Sloop rigging. Helm style differs too: the Beneteau First 36S7 1995 uses a 1 tiller versus a 2 wheels on the Beneteau First 51 1986. Wheel helms give better leverage and visibility on larger boats; tillers offer direct feedback and simplicity on smaller ones. The Beneteau First 51 1986 has a documented auxiliary engine of 80 hp.
Hull speed is rated at 8,8 knots for the Beneteau First 51 1986 and 7,5 knots for the Beneteau First 36S7 1995.
Bottom line: The Beneteau First 51 1986 is the offshore and bluewater choice - at 28 660 lbs displacement and 51 ft it has the load capacity, range, and seakeeping for extended passages. The Beneteau First 36S7 1995 at 12 787 lbs is the more nimble, accessible option - easier to single-hand and better suited to coastal and inland sailing.