March 13, 2026
The Sanlorenzo Alloy: 146 Feet That Opened a New Era
Sanlorenzo says the Alloy range started a new era in its production. At 146 feet and 490 GT, with twin MTU M96Ls and 21 knots, it is still t…
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Expert Review, Technical Specifications & Market Analysis
The Essentials
| Feature | Specifications |
|---|---|
| Overall Length | 146' 0" (44.5 m) |
| Beam | 29' 6" (9 m) |
| Displacement | 490 GT (gross tonnage — Sanlorenzo publishes no displacement figure) |
| Engines | 2 × MTU 16V2000 M96L |
| Fuel Capacity | 12,152 US gallons (46,000 L) |
| Cabins / Heads | 10 guests / 9 crew |
| Max Speed | 21 knots |
Source: Spec & Photos courtesy of Sanlorenzo. Specs verified by Tony Smith, USCG 100 Ton Master, on August 11, 2026.
Part of the Sanlorenzo Alloy series — see how owners step up through the lineup.
Quick Verdict
- The only model in Sanlorenzo's Alloy line — the yard says the range started a new era in its production
- 490 GT on a 146-foot hull, with twin MTU 16V2000 M96L power for a published 21 knots
- 46,000 litres of fuel, 10 guests and 9 crew, with interiors conceived as fluid living spaces rather than staterooms
Our Take
The Alloy is a genuinely significant boat for Sanlorenzo — the yard's own line is that the range started a new era in its production, and it is still the only model in that line. At 146 feet and 490 gross tons it sits in a useful place: substantial volume, a published 21 knots, and a crew of nine rather than the fifteen a larger boat would demand.
Sanlorenzo describes advanced naval engineering optimising volume, responsiveness and seaworthiness while enabling expansive deck areas, and interiors conceived as fluid living spaces rather than a set of staterooms. On a boat this size that distinction is not marketing; it is the difference between a yacht you live on and a hotel you visit.
Two things to have in hand before you go further. First, take the horsepower rating for the MTU 16V2000 M96L package from the engine documentation for the specific hull rather than from a spec site. Second — and I would want it in writing — have the yard confirm the hull construction for the specific boat. Construction decides how a yacht is surveyed, insured and maintained, and it belongs in the build specification, not a brochure.
Watch Our Sanlorenzo Alloy Reviews
Official Sanlorenzo Premiere: Inside the Sanlorenzo Alloy
Video courtesy of Sanlorenzo.
Sanlorenzo Alloy Photo Gallery
Photos courtesy of Sanlorenzo.
Sanlorenzo Alloy Articles & Guides
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Frequently Asked Questions
Is the Sanlorenzo Alloy built from aluminium?
This needs confirming with the yard for the specific hull. Sanlorenzo's own page describes the Alloy's steel hull and aluminium superstructure, on a model whose range is named Alloy, while much of the material in circulation describes an all-aluminium hull. Those are different boats to survey, insure, paint and maintain, so have the builder confirm the construction in writing before contract.
How many models are in the Sanlorenzo Alloy range?
One. The Alloy line consists of a single 44.5-metre model, which Sanlorenzo now lists simply as Alloy and has previously called 44Alloy and Alloy 44 — the length is unchanged at 146 feet exactly. Sanlorenzo describes the range as having started a new era in its production, born from the spirit of the original SL planing yachts, and it remains the only model in the line.
How fast is the Sanlorenzo Alloy?
Sanlorenzo publishes a maximum speed of 21 knots, from twin MTU 16V2000 M96L engines; take the horsepower rating from the engine documentation for the specific hull. Twenty-one knots on a 44.5-metre hull carrying 490 gross tons is genuinely quick for the volume, and it is the main reason to consider this yacht over a displacement design of similar size.