The Beneteau First 51 1986 vs Beneteau Gran Turismo 46 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.

On paper these two are close siblings in the size department — Beneteau First 51 1986 at 51,4 ft versus Beneteau Gran Turismo 46 2020 at 48,6 ft. Weight tells a clearer story for trailering families: the Beneteau First 51 1986 tips the scales at 28 660 lbs — 6 480 lbs more than the Beneteau Gran Turismo 46 2020 at 22 180 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 435 hp, the Beneteau Gran Turismo 46 2020 has a 355-hp advantage over the Beneteau First 51 1986'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 Beneteau Gran Turismo 46 2020 carries 238 gallons versus 185 gallons in the Beneteau First 51 1986. 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 Gran Turismo 46 2020 caps at 14. 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 6 480-lb difference over the Beneteau Gran Turismo 46 2020 at 22 180 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 3,8 ft for the Beneteau Gran Turismo 46 2020. That 5,4-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 51 1986 uses Sloop rigging. For auxiliary power the Beneteau Gran Turismo 46 2020 carries a 435-hp engine against 80 hp on the Beneteau First 51 1986. 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 30,0 knots for the Beneteau Gran Turismo 46 2020 and 8,8 knots for the Beneteau First 51 1986. For extended cruising, water capacity matters: the Beneteau Gran Turismo 46 2020 carries 106 gallons versus 74 gallons on the Beneteau First 51 1986 — a significant advantage on longer passages where watermaker or provisioning stops aren't guaranteed.