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Effects of Narrow Channels - Coggle Diagram
Effects of Narrow Channels
Bank effect
Suction of stern
Cushion of bow
No ship
can possess
controls-fixed positional stability
with respect to centreline of canal
Any Ship operating
on the centre of canal
is in unstable equilibrium
Need controls
More Rudder angle needed
To maintain off-centreline course
The shallower the water
The Narrower the channel
Angle towards bank
De-Verdiere and Audren
Human helmsman in simulated canal
Ships forms full at bow and sharp at stern
More favourable for good handling
Twin-screw
increases manoeuvring qualities
Rudder abaft of propellers
Critical Speed
Increases with
increased ratio of Cross Sectional Width of Canal x Midship Section Area of Ship
So
Narrower channel
needs less speed