The Achilles LS2-RU 2009 vs Achilles LSI-104 2007 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 Achilles LS2-RU 2009 measures 7,5 feet overall (2009), giving it roughly 6,5 additional feet of deck space compared to the Achilles LSI-104 2007 at 1,0 feet (2007). At 56 lbs and 77 lbs respectively, both sit in a similar weight class — either should pair comfortably with most mid-size SUVs and half-ton trucks, though always confirm your specific tow rating with the motor added.
Both boats share a closely matched power ceiling — 4 hp for the Achilles LS2-RU 2009 and 10 hp for the Achilles LSI-104 2007. 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.
For family outings this is probably the sharpest distinction between the two. The Achilles LSI-104 2007 is rated for 4 passengers, while the Achilles LS2-RU 2009 caps at 2. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Achilles LSI-104 2007 could be the deciding factor.
At this size, power-to-weight ratio matters more than outright horsepower. The Achilles LSI-104 2007 comes in at 8 lbs per hp versus 14 lbs per hp for the Achilles LS2-RU 2009. 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 Achilles LSI-104 2007 if your priority is putting more people on the water — it handles 4 passengers and at 1,0 ft it has the deck room to back that rating up comfortably. The Achilles LS2-RU 2009 is the smarter pick if you want a lighter, easier-to-trailer boat rated for 2 that costs less to run day-to-day.