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Types of Resistance - Coggle Diagram
Types of Resistance
Eddy Resistance
Due to turbulence
Aft of structures
Cause low pressure
Drag
Frictional Resistance
Boundary Layer
Close to hull
particles same velocity of hull
\( Rf=fSV^{1.83}\)
f - Coefficient of Friciton
S - Total Wetted Area
V - velocity
Appendage Resistance
Proportional to wetted suface
of appendage
Propostional to \( vˆ2 \)
Air and Wind Resistance
Air Resistance
1,5 to 3% :
Total water resistance
Wind
Might be high resistance
Squat
high speed
Sinks
Ship-length aprox 1,2
bow rises
stern sinks
Increases resistance
Shallow Water Effect
Longer wave length
Squat occurs
lower speeds
Wave Resistance
Rough Water