Question

With reference to rudder carrier bearings fitted to Merchant ships:

(a) Sketch a bearing designed to transfer the full weight of the rudder to the ships structure. (6)

(b) Describe the consequences if the rudder carrier bearing surfaces become heavily scored. (6)

(c) Describe the consequences of and the action to be taken, if the carrier shatters. (4)

Answer 1

Part (a)

Part (b)

Increased vibration and operational instability.
Generation of noise during rudder movement.
Sluggish rudder movement due to impaired smooth operation of the bearing.
Overheating of the bearing, which may lead to further damage or failure.
In the worst case, sluggish to no movement at all, risking loss of rudder functionality.

Part (c)

Increased noise and vibration.
Rudder movement becomes sluggish or completely immobilised.
Risk of additional damage to associated components like rudder stock and steering gear.

Actions:

Supplement extra greasing to mitigate friction and reduce further damage.
Use eye bolts and chain blocks to take the load off the rudder stock and minimize pressure on the shattered carrier.
Avoid sudden or sharp rudder movements to prevent exacerbating the issue.
Arrange for renewal or replacement of the rudder carrier bearing at the earliest opportunity.

✓ Verified Model Answer (Text Solution)