The Beneteau Idylle 10.50 1985 vs Beneteau Swift Trawler 34 2011 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 Idylle 10.50 1985 at 34,5 ft versus Beneteau Swift Trawler 34 2011 at 36,6 ft. Weight tells a clearer story for trailering families: the Beneteau Swift Trawler 34 2011 tips the scales at 16 466 lbs - 6 325 lbs less than the Beneteau Idylle 10.50 1985 at 10 141 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 425 hp, the Beneteau Swift Trawler 34 2011 has a 397-hp advantage over the Beneteau Idylle 10.50 1985's 28-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 Swift Trawler 34 2011 carries 211 gallons versus 24 gallons in the Beneteau Idylle 10.50 1985. 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 Swift Trawler 34 2011 is rated for 11 passengers, while the Beneteau Idylle 10.50 1985 caps at 10. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Beneteau Swift Trawler 34 2011 could be the deciding factor.
The Beneteau Idylle 10.50 1985 has a documented displacement of 10 141 lbs. Displacement data wasn't available for the other boat in this comparison.
The Beneteau Idylle 10.50 1985 uses Sloop rigging. The Beneteau Idylle 10.50 1985 has a documented auxiliary engine of 28 hp.
For extended cruising, water capacity matters: the Beneteau Swift Trawler 34 2011 carries 85 gallons versus 61 gallons on the Beneteau Idylle 10.50 1985 - a significant advantage on longer passages where watermaker or provisioning stops aren't guaranteed.
Bottom line: The Beneteau Swift Trawler 34 2011 at 36,6 ft offers more living space, greater range, and a more substantial offshore capability. The Beneteau Idylle 10.50 1985 at 34,5 ft is the easier, lower-cost option - simpler to crew and a strong choice for coastal and day sailing.