S-Classes
S-classes means Sport Outboards. Boats are mainly catamaran type and engines use gasoline as fuel. Some modifications may be done in engine.
S-500 Aldur Raudva (EST) 1991, three World records
S-550 2008 Mikk Joala (EST)
S-850 Sami Pennanen (FIN), World Champion
F-4 (F4s, SL-60) Matthew Palfreyman 2011
SE Bonvincini and Vassena