328 NICHOLLS'S SEAMANSHIP AND NAUTICAL KNOWLEDGE
Ii I had to unship the rudder while the vessel was afloat the pro-
cedure would be the same except for two things. I should not be able
to have a jack underneath the rudder to assist my purchase when
heaving up; also, when the rudder head was lowered down clear of the
trunk I should have to get another purchase on to it to lift the rudder
up into a barge, or possibly on to the dock wall if alongside.
18. Sow would you unship a propeller?
With two tackles hung over the quarter, one on each side. They
should be three-fold purchases, and either wire or manila may be used
for the falls. Sling the propeller round the boss with good chain, and
shackle the lower blocks of both purchases on to it. Take the weight,
putting an equal strain on both tackles. Unscrew the lock nut. Re-
move the key. Start the propeller by means of steel wedges. In
some yards hydraulic power is used. Disconnect an intermediate
length of shafting. Draw in the tail shaft. Slack away on one
tackle. The propeller will then swing out clear of the stern frame,
the whole of the weight gradually coming on to the other tackle. Land
it on some heavy planks or on to a trolley if it is to be moved away.
19 Your windlass is broken down. How would you heave up your
anchor?
With a tackle. Reeve off a good three-fold purchase. Take the
block having the hauling and standing part of the rope in it and shackle
it on to the cable close abaft the hawsepipe. Overhaul the purchase
to a good long drift and make as fair and clear a lead as possible. Attach
the other block to some secure object such as a pair of bitts or a side
bunker hatch. Do all that can be done to avoid chafe.
Take the fall to a fore deck winch and heave away. Use the engines
to ease the strain on the purchase. It will be necessary to stopper the
cable oil and fleet the purchase from time to time. Heave the anchor
right up into the pipe and secure it.
If unable to get the anchor away by this means, make the cable
well fast and break the anchor out by going ahead on the engines.
20. Tour kedge anchor is foul. How would' you recover it?
Get two motor boats away and sweep for it with a bight of wire.
Having got the anchor in the bight, bring the two parts of the wire
together, place a large shackle round them and let it run down on to
the anchor. Heave away on both parts of the wire.