Aluminium
Tough, light and popular for high-latitude expeditions
Welded marine-grade aluminium alloy is light, very strong and doesn't rust. Hulls are often left unpainted, which removes most cosmetic upkeep. It is especially popular for French centreboard cruisers and expedition yachts.
Strengths
- Takes groundings and ice well
- No rust; can be left unpainted
- Lighter than steel for the same strength
Weaknesses
- Galvanic and stray-current corrosion is a real risk
- Welding repairs need a specialist
- Expensive to build
Ratings
7
3
9
7
6
6
Buying used: what to check
Check the electrical system for stray-current leaks and look for pitting near through-hulls and dissimilar metals. Ask for an ultrasonic thickness test.