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Wind and Air Resistance - Coggle Diagram
Wind and Air Resistance
Depends
Superestructure Area
Formula Taylor
\( 1,28 \times \frac{1}{2} \rho A_t V_r^2 \)
\( 0,783 \times \frac{1}{2} B^2 V_r^2 \)
Still air
Maximum Wind resistance
30º from bow
increase rudder angle
compensate
Hughes
\( 0,734A_t V_r^2 \)
Total Resistance
of separate units
Less than the sum of the separate resistance
Due to shielding
Shear on main hull forward
considerable shielding
Reduce Resistance head wind
Rounding, tapering or stepping back
Fore ends
Shear on main hull
shielding effect
streamline erections
reduce up to 30%
Jeorgensen
Existence of leeway
effects wake
influence propulsive efficiency
Van Berlekom
Same magnitude
Direct wind force
Added Resistance due to waves
Yaw moment
depends on superestructure position
Leeway
Wind less important than waves