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Conventional Tug - Rudders - Coggle Diagram
Conventional Tug - Rudders
Becker
Movable flap
20-30% rudder area
Turning
Main Rudder - 45-65°
Flap - more 45°
Total - 90-110°
Gains
Maximum Lift
Increased by 60-70%
Angle of 30°
Sideways thrust
Increases by 50% of ahead thrust
Can turn on spot
Moving astern
lower performance
Schilling Monovec Rudders (Fishtail)
No movable part
Plates on top and bottom
30-40% more lift than normal
Angle until 70°
slipstream deflected 90°
"Side thruster"
Moving Astern
More effective than normal
Maximum Lift
Angle of 40°
Flanking Rudders
In front of rudder
usually 2 rudders
Enhance steering peformance
going
Astern
Going ahead
kept midships
Towmaster System
3 rudders aft
2 flanking rudders
Conjunction with nozzles
Rudder angles up to 60°
Scott T. Allen Tug
Triple Screw
3 rudders
Centre one can be operated individually
Bow Thrusters
Low speeds only
Around 2 knots
Retractable 360°
Combi Tugs
Schilling VecTwin
2 rudders
105° outboard
40° inboard
Side thrust up to 70% of ahead thrust
Thrust vectored through 360°, no need to reverse engine
