Propulsion Forces - Shiphandling Facts and Rules

Question 1

Propulsion Forces - transverse thrust power % of stern power

Answer 1

5-10% of applied stern power

Question 2

Propulsion Forces - transverse thrust vs. rudder force under sternway (Hooyer)

Answer 2

transverse thrust more powerful than rudder force when under sternway (Hooyer pg 36)

Question 3

Propulsion Forces - transverse thrust DIW (Hooyer)

Answer 3

transverse thrust is optimal when DIW with Longitudinal Inertia (Hooyer pg 36)

Question 4

Propulsion Forces - Longitudinal Resistance =
(Hooyer)

Answer 4

25% of propulsion force under constant speed

Question 5

Propulsion Forces - astern power % of ahead

Answer 5

• astern power is 60% of ahead (conventional propeller)
• 40-45% (CPP)

Question 6

Propulsion Forces - Rudder force under sternway (Hooyer)

Answer 6

rudder force plays insignificant role when under sternway (Hooyer pg 35)