Matching a inflatable rigid Zodiac Cadet RIB 340 2011 against a deep vee Zodiac Medline 500 2013 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.
Size is the most obvious dividing line here. The Zodiac Medline 500 2013 measures 16,4 feet overall (2013), giving it roughly 5,3 additional feet of deck space compared to the Zodiac Cadet RIB 340 2011 at 11,2 feet (2011). Weight tells a clearer story for trailering families: the Zodiac Medline 500 2013 tips the scales at 778 lbs — 606 lbs less than the Zodiac Cadet RIB 340 2011 at 172 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 — 25 hp for the Zodiac Cadet RIB 340 2011 and 40 hp for the Zodiac Medline 500 2013. 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 Zodiac Medline 500 2013 is rated for 9 passengers, while the Zodiac Cadet RIB 340 2011 caps at 5. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Zodiac Medline 500 2013 could be the deciding factor.
At this size, power-to-weight ratio matters more than outright horsepower. The Zodiac Cadet RIB 340 2011 comes in at 7 lbs per hp versus 19 lbs per hp for the Zodiac Medline 500 2013. 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.
The Zodiac Cadet RIB 340 2011 has a documented top speed of 30 mph. Speed data wasn't available for the other model.
The Zodiac Medline 500 2013 is an inflatable design — lighter, easier to store, and quicker to launch from a beach or dock without a slipway. The Zodiac Cadet RIB 340 2011 is a rigid hull, which typically offers a more confident ride in chop and easier maintenance over the long term.
Bottom line: Choose the Zodiac Medline 500 2013 if your priority is putting more people on the water — it handles 9 passengers and at 16,4 ft it has the deck room to back that rating up comfortably. The Zodiac Cadet RIB 340 2011 is the smarter pick if you want a lighter, easier-to-trailer boat rated for 5 that costs less to run day-to-day.