RIO 20 Information, Review, Specs

RIO 20 Drawing
Make
RIO
Model
20
Builder
Multiglass
Designer
Roberto Barros
Number Built
Production Year(s)
1975 - ??

The Rio 20 stands as a foundational pillar of the Brazilian recreational sailing industry, representing one of the earliest successful collaborations between the builder MultiGlass and the prolific naval architect Roberto Barros. Launched in the early 1980s, this 20-foot fiberglass monohull was designed to bring affordable, capable coastal cruising to a burgeoning market of South American sailors. As a "pocket cruiser," the Rio 20 was engineered to balance the simplicity of a daysailer with the structural integrity required for short-range offshore hops. While MultiGlass produced the vessel in a production environment, the design shares significant DNA with the custom and amateur-built philosophies championed by B&G Yacht Design, ensuring that the hull is both robust and easily maintained by an owner-operator.

Sailing Performance & Handling

The Rio 20 is characterized by its nimble, responsive handling, a trait common to Roberto Barros’s smaller displacement designs. With a hull length of approximately 6.10 meters and a relatively generous beam for its size, the boat offers surprising initial stability. On the water, it behaves as a light-displacement cruiser that favors light-to-moderate winds; however, its fractional sloop rig allows for easy depowering when the breeze freshens.

Owners often report that the boat tracks well for a short-waterline vessel, though it requires active sail trimming to maintain optimal heel angles. The rudder configuration—typically a transom-mounted blade—provides direct feedback to the helm, making it an excellent teaching platform for novice sailors. While it lacks the raw speed of modern sportboats, its "sea-kindliness" is frequently cited in regional sailing circles; the boat's entry is fine enough to slice through chop without the excessive pounding often found in flat-bottomed designs of this era. According to technical overviews provided by the designer at B&G Yacht Design, the focus was on a balanced helm and a predictable motion in the coastal swells of the Atlantic.

Interior Comfort & Variations

Despite its modest 20-foot LOA, the Rio 20 features a functional enclosed cabin that elevates it above a standard daysailer. The layout is optimized for "camping style" cruising, typically accommodating two to four adults in a pinch. The interior usually consists of a forward V-berth and two narrow quarter berths or settee berths flanking the companionway.

The headroom is limited—standard for a boat of this size—requiring a "sitting headroom" approach to life below deck. MultiGlass utilized a mix of molded fiberglass liners and basic woodwork to keep the interior bright and low-maintenance. While the Rio 20 did not see the extensive multi-cabin variations of its larger sibling, the Atoll 23, some units were customized with basic galleys featuring a single-burner stove and a small manual water pump. The boat's sibling, the Atoll 23, was essentially an evolution of the Rio 20's philosophy, offering more standing room and a dedicated head compartment, which many Rio 20 owners eventually transitioned to as their families grew.

Known Issues & Buyer’s Checklist

Prospective buyers of a MultiGlass Rio 20 should focus their inspection on the structural longevity of the fiberglass and the integrity of the rig.

  • Deck Delamination: Like many boats built in the 1980s, the Rio 20 uses a cored deck. High-moisture readings or "spongy" spots around the chainplates and stanchion bases are common signs of core rot that require professional attention.
  • Keel-to-Hull Joint: Inspect the "smile" at the leading edge of the keel. If the boat has been grounded or if the keel bolts have not been torqued recently, water can seep into the laminate.
  • Rudder Hardware: The pintles and gudgeons on the transom are high-wear items. Check for excessive play or hairline fractures in the stainless steel fittings.
  • Original Gelcoat: Many Rio 20s have spent decades in the high-UV environment of the Southern Hemisphere. Chalking or deep crazing may necessitate a full professional paint job (Awlgrip or similar) to protect the underlying laminate.

Community & Resources

The Rio 20 benefits from being part of the wider Roberto Barros design family. While there is no longer a dedicated MultiGlass factory support system, the B&G Yacht Design office remains a vital resource for technical drawings and refit advice. Furthermore, the "Clubinho do Rio 20" and similar informal owner groups in Brazil provide a wealth of localized knowledge regarding parts and regional modifications.

The Verdict

The Rio 20 is an honest, stout little cruiser that punches above its weight class in terms of seaworthiness and charm. It is an ideal entry-level boat for those who value traditional design and robust construction over modern amenities.

Pros

  • Robust Design: Engineered by Roberto Barros to handle genuine coastal conditions.
  • Ease of Handling: Simple rig and responsive helm make it perfect for solo sailors.
  • Affordability: Low entry price and minimal maintenance costs compared to larger cruisers.

Cons

  • Limited Headroom: Interior life is restricted to a sitting or reclining position.
  • Age-Related Wear: Most units will require some level of restoration to the deck core or rigging.
  • Lightweight: While nimble, it can feel "lively" (unsettled) in heavy gusting conditions.

Measurements

Construction & Hull

Construction Material
Fiberglass
Hull Type
Monohull Sailboat
Keel Type
Fin
Rudder
1x Transom-Hung
Ballast
661 lbs
Displacement
1764 lbs
Water Capacity
-
Fuel Capacity
-

Dimensions

Length Overall (LOA)
20.01 ft
Waterline Length (LWL)
16.4 ft
Beam
7.09 ft
Draft
3.44 ft
Max Headroom
-
Air Draft
-
Hover over a measurement
IJPE FS LOALWL

Rig & Sails

Rig Type
Masthead Sloop
P (Main Luff)
-
E (Main Foot)
-
I (Foretriangle Height)
-
J (Foretriangle Base)
-
Forestay Length (est)
-
Sail Area
258 sqft

Calculations

Sail Area / Displacement (SA/D) Ratio
28.27
Ballast / Displacement Ratio
37.47
Displacement / Length Ratio (D/L) Ratio
178.53
Comfort Ratio
11.47
Capsize Screening Formula
2.35
Hull Speed
5.43 kn