Academics – Naval Architecture : 2020/AUG/06
Question
Q6. The force acting normal to the centreline plane of a rudder is given by the expression:
Fn=15.5 A v2 α newtons
Where: A=rudder area ( m2)
v=ship speed (m⁄s)
α=rudder helm angle ( degrees)
A ship travelling at a speed of 20 knots, has a rudder configuration as shown in Fig Q6.
The centre of effort for areas A1 and A2 are 32 % of width from their respective leading edges. The rudder angle is limited to 35 o from the ship’s centreline
Calculate EACH of the following:
(a) The diameter of the rudder stock required for a maximum allowable stress of 77 MN/m2 (12)
(b) The drag component of the rudder force when the rudder is put hard over at full speed. (4)
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