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Appendage Resistance - Coggle Diagram
Appendage Resistance
Multiscrew
Bossings
Open Shafts
Struts
More rudders
Single Screw
Bilge Keels (bolina)
Rudders
Transition
laminar to turbulent
Critical Reynolds Number
Boundary layer
moves forward
increases drag
Bilge Keels
Skin friction
due to
additional wetted surface
Interference drag
junction of bilge keel
with hull
Shafts and bossings
Shaft is inclned
lift and drag
frictional drag
Control Surfaces (rudders, stabilizers...)
Rudders
Subjected to
higher velocity
propeller slipstream
Best model
determine experimentally