BOA.T CONSTRUCTION 103
Boat Construction.
L In what way does a " carve! built" boat differ from one that is
"clincher built?"9
As regards construction,, tLe principal and most noticeable difference
is in the arrangement of the planking. In a carvel built boat the edges
(and ends) of the planks butt squarely up against each other, and are
not overlapped as in a elm char built boat. The planking is laid close
on to the timbers, and shows a smooth flush surface both inside and
outside.
In a clincher built boat, each strake of planking has a landing
edge on the strake next below it. This leaves a vacant space of tapered
shape inside the boat between each timber and strake of planking, and
an uneven surface on the planking. It is, however, a strong system of
construction on account oi tb.e many doublings formed by the landing
edges of the strakes
In sailing qualities the carrel built boat is faster than the one which
is clincher built, but the latter oa account of the small rolling chocks
formed by the plank edges is steadier in the water.
2. In what way does the procedure of building a ship differ from
that of building a clincher built boat?
When building a ship, after the keel is laid the frames are erected,
plumbed, and horned, and the plating is secured and riveted to the
frames.
In the case of a clincher built boat, part of the procedure is reversed,
that is, the planking is done first, tke frames (timbers) being steamed and
put in afterwards.
3. How many thwarts are required to be fitted in a boat?
The number depends oa the length of the boat,
18 feet in length and under 4 thwarts
over 18 and not above 24 feet 5 thwarts
over 24 and not above 28 feet 6 thwarts
over 28 and not above 30 feet 7 thwarts
4. How much "rise of floor" ia generally given to a life-boat I
Six inches in 4 feet.
5. Describe the kinds of wood which are commonly used for planking
Yellow pine, larch, Vych elm, teak* or mahogany. It must be