The Beneteau First 31.7 1997 vs Beneteau Oceanis 510 1994 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 Oceanis 510 1994 measures 50,2 feet overall (1994), giving it roughly 18,6 additional feet of deck space compared to the Beneteau First 31.7 1997 at 31,6 feet (1997). Weight tells a clearer story for trailering families: the Beneteau Oceanis 510 1994 tips the scales at 30 864 lbs — 22 597 lbs less than the Beneteau First 31.7 1997 at 8 267 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 80 hp, the Beneteau Oceanis 510 1994 has a 59-hp advantage over the Beneteau First 31.7 1997's 21-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 Oceanis 510 1994 carries 148 gallons versus 8 gallons in the Beneteau First 31.7 1997. 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 Oceanis 510 1994 is rated for 15 passengers, while the Beneteau First 31.7 1997 caps at 9. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Beneteau Oceanis 510 1994 could be the deciding factor.

Displacement is where these two sailboats genuinely part ways. The Beneteau Oceanis 510 1994 displaces 30 864 lbs — a 22 597-lb difference over the Beneteau First 31.7 1997 at 8 267 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 — 6,2 ft and 5,9 ft respectively. Marina access and anchorage options should be broadly equivalent between the two.

The Beneteau First 31.7 1997 is rigged as a Sloop while the Beneteau Oceanis 510 1994 carries Masthead-sloop rigging — a meaningful difference in sail handling complexity, upwind performance, and the size of crew you'll need to work the boat comfortably. For auxiliary power the Beneteau Oceanis 510 1994 carries a 80-hp engine against 21 hp on the Beneteau First 31.7 1997. Motoring range and ability to punch through a foul current or enter a tight marina under power will favour the more powerful installation.

For extended cruising, water capacity matters: the Beneteau Oceanis 510 1994 carries 264 gallons versus 42 gallons on the Beneteau First 31.7 1997 — a significant advantage on longer passages where watermaker or provisioning stops aren't guaranteed.