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Twin Screws, Usually - Coggle Diagram
Twin Screws
Side forces are Large
Uniformly In direction of rotation of propeller
If going ahead or astern
cancel each other
Following wake
Considerably reduced
Tip pass closest to hull
working a wake of only 15% of speed
Inclination Effect
Same as Single Screw
Helical Discharge Effect
Only
2 rudders ship
Augmented by shape of rudder
Shallow submergence
Considerable
Dead in Water
Side forces
same magnitude as Single Screw
When backing
Smaller side forces
compared to single screw
Less helical discharge force
due to reduced structure
Throws outwards of the hull
Usually
Righthanded in STB
Lefthanded in PS