Ocean Alexander 420 Sundeck Yacht Search Stock & Used Yachts The 420 Sundeck is a flybridge boat from American builder Ocean Alexander. This planing yacht is constructed from GRP and can deliver speeds in excess of 18 knots. Read More Specs Length 12.88m Materials GRP Hull & Superstructure Show Full Specs Hide Full Specs Full Specification Principal Characteristics Length overall 12.88m Beam 4.24m Draft (full load) 0.97m Fuel capacity 1,136 Litres Fresh Water capacity 568 Litres Black water capacity 257 Litres Max speed 18 Knots Hull GRP Superstructure GRP Engines & Performance Standard Option Cummins QSB6.7 425mhp QTY x 2 Performance 419 HP (312 Kw) each @ 3000 rpm Maximum Speed 18 knots Engine Details Show Full Specs Hide Full Specs