The Beneteau Oceanis 390 1987 vs Beneteau R/C 42 1981 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 R/C 42 1981 measures 43,4 feet overall (1981), giving it roughly 5,2 additional feet of deck space compared to the Beneteau Oceanis 390 1987 at 38,2 feet (1987). Weight tells a clearer story for trailering families: the Beneteau R/C 42 1981 tips the scales at 22 377 lbs — 8 047 lbs less than the Beneteau Oceanis 390 1987 at 14 330 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.

Both boats share a closely matched power ceiling — 50 hp for the Beneteau Oceanis 390 1987 and 50 hp for the Beneteau R/C 42 1981. Real-world performance will come down more to which motor is actually bolted on, its load at the time, and whether it's a 4-stroke or 2-stroke setup. Fuel capacity breaks the other way: the Beneteau Oceanis 390 1987 carries 46 gallons versus 40 gallons in the Beneteau R/C 42 1981. 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 R/C 42 1981 is rated for 13 passengers, while the Beneteau Oceanis 390 1987 caps at 11. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Beneteau R/C 42 1981 could be the deciding factor.

Displacement is where these two sailboats genuinely part ways. The Beneteau R/C 42 1981 displaces 22 377 lbs — a 8 047-lb difference over the Beneteau Oceanis 390 1987 at 14 330 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 — 5,5 ft and 5,7 ft respectively. Marina access and anchorage options should be broadly equivalent between the two.

The Beneteau Oceanis 390 1987 uses Sloop rigging.

Hull speed is rated at 8,1 knots for the Beneteau R/C 42 1981 and 7,7 knots for the Beneteau Oceanis 390 1987. For extended cruising, water capacity matters: the Beneteau Oceanis 390 1987 carries 169 gallons versus 106 gallons on the Beneteau R/C 42 1981 — a significant advantage on longer passages where watermaker or provisioning stops aren't guaranteed.