The SeaArk Forecast 156 2006 vs SeaArk Stealth 172 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 — SeaArk Forecast 156 2006 at 15,0 ft versus SeaArk Stealth 172 2011 at 17,2 ft. Weight tells a clearer story for trailering families: the SeaArk Stealth 172 2011 tips the scales at 925 lbs — 857 lbs less than the SeaArk Forecast 156 2006 at 68 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 75 hp, the SeaArk Stealth 172 2011 has a 35-hp advantage over the SeaArk Forecast 156 2006's 40-hp ceiling — enough to notice on acceleration and at cruising speed, particularly with a full passenger load.
Both boats are rated for 4 passengers — a good fit for a family of four or five plus guests. Comfort at capacity is another matter; the longer hull typically means more seat options and better weight distribution.
At this size, power-to-weight ratio matters more than outright horsepower. The SeaArk Forecast 156 2006 comes in at 2 lbs per hp versus 12 lbs per hp for the SeaArk Stealth 172 2011. 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: The SeaArk Stealth 172 2011 at 17,2 ft is the right call if deck space, comfort, and entertaining are top of your list. The SeaArk Forecast 156 2006 at 15,0 ft wins on trailering ease, likely lower purchase price, and simpler docking — a solid choice for a buyer who wants more boat for less money.