Design and Construction
The Scia 50 measures 50.7 feet overall, with a 41.3-foot waterline and a beam of 13.35 feet. Her length-to-beam ratio of 3.88 is moderately narrow by modern standards but typical of a 1970s performance cruiser.
The hull and deck are solid fiberglass. Displacement is roughly 28,200 pounds, including 12,800 pounds of lead ballast. The long keel draws between 6.9 and 7.2 feet, depending on load.
Her immersion rate is about 1,478 pounds per inch. That substantial figure means crew movement and added weight have relatively little effect on how deeply she sits. The bottom has approximately 45 square meters of wetted surface. That large area, combined with the long keel, speaks to directional stability rather than fingertip maneuvering.
Rig, Performance, and Handling
The Scia 50 carries a masthead sloop rig with 598 square feet of working sail area between the mainsail and jib. Her sail-area-to-displacement ratio is 18.8 using the ISO reference sail, rising to 22.8 with a 135% genoa. For a cruiser of her era, that puts her firmly at the lively end of the spectrum.
A displacement-length ratio of 152 classifies her among light racers, while her theoretical hull speed is 7.6 knots. The capsize screening value is 2.33, and the Motion Comfort Ratio is 15.1. Taken together, those figures describe a boat that should move well in a breeze but demands respect offshore.
The recommended running rigging is substantial. The 14 mm mainsheet is 38.8 meters long, while the 14 mm halyards are 32.5 meters. Jib and genoa sheets are 15.5 meters long and 16 mm in diameter.
Accommodations and Tankage
The known design record doesn’t describe the interior arrangement in detail. The builder’s specifications do, however, list 264 gallons of water and 102 gallons of diesel. Those capacities are consistent with a boat intended for extended coastal or offshore passages rather than weekend racing alone.
Auxiliary power comes from a single 63-horsepower British Leyland diesel, a period-correct choice for a hull of this displacement.
Refit and Ownership Considerations
Owning a Scia 50 means living with a 1970s Italian interpretation of the light racer: a boat with genuine payload capacity, reflected in the 1,478 lb/inch immersion rate, but also a sail plan that rewards active sailing.
The 63 hp British Leyland engine is a period unit, so parts support and access to knowledgeable mechanics will matter more than its paper specification. When replacing the running rigging, the quoted original dimensions—14 mm for the mainsheet and halyards, and 16 mm for the jib and genoa sheets—provide a useful reference and help avoid undersizing it.
The Verdict
The Scia 50 is a thoroughly period-correct Sciarrelli design: a long-keeled, solid-fiberglass masthead sloop that balances light-racer liveliness with serious cruising tankage. She isn’t a modern, beamy cruiser. Her 2.33 capsize screening value and 15.1 Motion Comfort Ratio place her closer to a lively sea boat than a condo-maran.
For a sailor looking for a traditional Mediterranean hull with credible performance, the Scia 50 is a coherent choice.
Pros
- Solid-fiberglass hull and deck, with the directional stability of a long keel
- Light-racer displacement-length ratio of 152
- Sail-area-to-displacement ratio of 22.8 with a 135% genoa
- Generous capacities of 264 gallons of water and 102 gallons of diesel for passage-making
Cons
- Narrow 3.88 length-to-beam ratio limits interior volume compared with modern designs
- Theoretical hull speed of 7.6 knots caps outright pace under power or in light air
