Paul,
as i remember several "long time ago lessions" for slower ones like bulkers, tankers and cargo ships you can use following calculation: 1/50 * length * draught
e.g. Aframax tankers have an average rudder area of 50 m2 to 60 m2. the Nippon Princess is an Aframax tanker. L=229; D=12.8 => 1/50 * 229 * 12.8 = 58,62 m2 rudder size
Your example: L=10.06; D=1.40 => 1/50 * 10.06 * 1.4 = 0,28 m2 rudder size
regards
N3lson