Matching a deep vee Alumacraft Navigator 175 Tiller 2010 against a modified vee Alumacraft Tournament Sport 185 2007 means you're likely deciding between two genuinely different on-water experiences. Hull type shapes everything from ride quality and fuel burn to dock handling and resale trajectory.
On paper these two are close siblings in the size department — Alumacraft Navigator 175 Tiller 2010 at 17,7 ft versus Alumacraft Tournament Sport 185 2007 at 18,0 ft. Weight tells a clearer story for trailering families: the Alumacraft Navigator 175 Tiller 2010 tips the scales at 1 145 lbs — 977 lbs more than the Alumacraft Tournament Sport 185 2007 at 168 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 175 hp, the Alumacraft Tournament Sport 185 2007 has a 100-hp advantage over the Alumacraft Navigator 175 Tiller 2010's 75-hp ceiling — enough to notice on acceleration and at cruising speed, particularly with a full passenger load. Fuel capacity breaks the other way: the Alumacraft Navigator 175 Tiller 2010 carries 38 gallons versus 4 gallons in the Alumacraft Tournament Sport 185 2007. 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 Alumacraft Tournament Sport 185 2007 is rated for 6 passengers, while the Alumacraft Navigator 175 Tiller 2010 caps at 5. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Alumacraft Tournament Sport 185 2007 could be the deciding factor.
At this size, power-to-weight ratio matters more than outright horsepower. The Alumacraft Tournament Sport 185 2007 comes in at 1 lbs per hp versus 15 lbs per hp for the Alumacraft Navigator 175 Tiller 2010. The lower the ratio the more explosive the acceleration — meaningful on a short RIB where bursts of speed, quick planing, and agility in surf or tight waterways define the experience.
Bottom line: Choose the Alumacraft Tournament Sport 185 2007 if your priority is putting more people on the water — it handles 6 passengers and at 18,0 ft it has the deck room to back that rating up comfortably. The Alumacraft Navigator 175 Tiller 2010 is the smarter pick if you want a lighter, easier-to-trailer boat rated for 5 that costs less to run day-to-day.