Superior Pontoons
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The Mark I

More deck. More friends. More fun.

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AVAILABLE SPRING 2027

Same slip. More room.

The Mark I tows at 8.5 ft wide, so it fits the trailer, slip and garage you already have. Once you're on the water, one control opens the deck to 12.5 ft.

12.5ft
BEAM, EXPANDED
8.5ft
BEAM, TRANSPORT
28ft
PONTOON LENGTH
300sq ft
DECK AREA

Less lean.

More stability.

Stability · bow-on view

More beam. Less lean.

Move your crew to one side of a pontoon and the deck tilts. How far depends mostly on one number: the distance between the outer tubes. Put the same group in the same spot on a standard 8′6″ pontoon and the 12′5″ Mark I, and compare.

8
About 1,440 lb at 180 lb each
2′10″ off center
From the centerline out to a standard boat’s rail, the same spot on both

Standard pontoon

8′6″ beam · 2 tubes
Deck lean
4.2°
Resistance to roll
1.00×

Mark I

12′5″ expanded beam · 3 tubes
Deck lean
1.6°
Resistance to roll
2.61×
62%

less lean on the Mark I, with the same 8 people standing in the same spot.

Why spacing wins

When weight moves to one side, the tubes on that side sink a little and the others rise. The boat settles where the extra buoyancy on the low side balances the load.

Spread the outer tubes farther apart and two things happen at once: each tube has more leverage against the load, and a small tilt moves each tube farther up or down in the water. Both effects multiply, so stability grows with the square of the spacing.

The Mark I’s center tube adds buoyancy and carrying capacity. It sits on the roll axis, so the wide-set outer tubes do the work of keeping the deck flat.

The relationshipresistance to roll ∝ spacing²Outer tube spacing goes from 6′3″ to 10′2″, 63% wider. Resistance to roll is 2.61 times the standard boat.

Illustrative static model in calm water. Assumes 25″ tubes with a 22 ft waterline, outer tube centers 13.5″ in from each deck edge, and 180 lb per person. Real-world stability also depends on tube size, load, speed and hull design. This is not a capacity rating.

What more room means.

10-15 occupancy

  • Families

    Room for 10 to 15 with the deck open. Nobody waits on the dock.

  • Fishing companies

    More anglers per trip, from the same slip and trailer.

  • Resorts

    More guests per rental, without a bigger slip.

Options for everyone.

Three floor plans: L-seat and bench, lounge and kitchen, or max seating. Three color schemes: black and red, silver and navy, white and seafoam.

Mark I Max Seating floor plan, seen from above1 / 3

Opens in one minute.

One control widens the deck from 8.5 ft to 12.5 ft in about a minute. Close it again and it's back to trailer width.

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Specifications

12.5ft
BEAM, EXPANDED
8.5ft
BEAM, TRANSPORT
28ft
PONTOON LENGTH
300sq ft
DECK AREA
29.5ft
LENGTH OVERALL (LOA)
25ft
DECK LENGTH
8ft
HEIGHT, TRAVEL
11.75ft
HEIGHT, DEPLOYED
10-15
OCCUPANCY
5,900lbs
WEIGHT
50gal
FUEL CAPACITY
~1min
EXPANSION TIME

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