2015 New York Safe Boating - 7

Planing Hull

makes it difficult to maneuver at high speed. Common
examples	of	this	hull	type	may	be	found	in	small	fishing	
boats (jon boats), rowboats, and houseboats.

At rest and slow speeds, the planing hull operates just as
a displacement hull does-it displaces a weight of water
equal to the weight of the boat and its load. But as power
increases, the shape of the planing hull provides lift that
enables the boat to ride upon the bow wave. This is called
being "on plane."

Round bottom hulls move easily through the water at slow
speeds, but they may roll or capsize in high seas. Sailboats
and trawlers often have round hulls.
The deep-V hull has a steep angle (>20 degrees) at the
bow that carries all the way to the stern of the boat. This
hull shape performs very well at high speed and in rough
water because its bow slices through the waves rather than
crashing	into	them.		The	deep-V	requires	more	power	than	
the other shapes to get on plane but is faster and more
stable once there. The main disadvantages of this hull shape
are that it requires a deeper draft and it tends to roll more at
rest.		The	deep-V	is	best	for	ocean	racing,	sport	fishing,	and	
any other application where high speed may be required in
rough water.

When the boat is on plane it escapes the wave system that
limits the speed of boats with displacement hulls. Less of the
hull is actually in contact with the water, so there is less water
resistance.
The amount of power available determines the top speed
of a planing hull, not the waterline length. While it takes a
considerable amount of power to get the boat on plane, less
power is needed to maintain plane or even to rapidly increase
speed once on plane. There are several shapes used in
planing	hulls,	including	flat	bottom,	deep-V,	and	semi-V	hulls.

The semi-V hull has a wider angle at the bow than the
deep-V	hull,	and	the	hull	flattens	toward	the	stern.	In	
The flat-bottomed boat has a shallow draft and is relatively
comparison	to	the	flat-bottom,	the	V	shape	of	the	bow	
stable. It requires the least amount of power to get on plane
cuts the waves and provides a better ride in choppy water
because	its	flat	surface	provides	excellent	lift.		This	hull	shape	
and reduces the tendency for the hull to "slide" in a turn.
gives a rough ride and tends to pound (slap up and down) in
Compared	to	the	deep-V	hull,	the	flat	stern	section	of	
choppy water. It also tends to "slide" when turning, which
the	semi-V	hull	provides	
excellent	lift	allowing	the	
hull to get on plane quickly
Types of Hulls
Advantages
Disadvantages
Comments
using less power. It also
tends to roll less at rest. The
key disadvantages become
Flat Bottom Hull
The	flat	bottom	offers	
		Flat	bottoms	tend	to	
Examples	of	flat	
evident as the seas increase.
	
	
	
the	best	planing	hull	and	 		pound	excessively	at	
bottom	hulls	are	
has a shallow draft.
planing speeds or in
skiffs or jon boats.
At higher speeds, this hull
choppy water.
shape pounds almost as
badly as the flat-bottomed
hull. The flat stern also
Round Bottom
A round bottom hull
Round bottom hulls
Trawlers and many
increases the possibility of
Hull
offers the best
have a tendency to roll
sailboats have
broaching from a large wave
displacement hull.
without a deep keel
round bottoms.
astern.
It will move easily through
the water at slow speeds.

Vee Hulls

Vee	bottom	boats	are	
		Vee	hulls	require	more	
planing hulls. They offer a power to move through
smoother ride in choppy
the water at the same
water.
speeds than flat bottom
boats.

Deep Vee Hulls

Multi-Hulls
		

	

or stabilizers. They are
more prone to capsizing
than other hull types.

	

Some	small	utility	
boats and some
runabouts have
vee hulls.

Deep vee bottom boats
have a sharper entry into
water and are smoother
riding than a vee hull.

Most runabouts
have this hull
shape.

The deep vee requires
more power than a vee
hull at the same speed

A	catamaran,	or	multi-hull,	 		Narrow	dock	slips	are	
has two or more hulls
a problem.
connected.		It	is	a	very		
		Less	popular	than		
stable type of boat
conventional hulls.
because of the wide beam.

7

Examples	include	
pontoon boats
and	Hobie	Cats.

Multi-hulls are seen on
catamarans and trimarans.
These are very stable boats
because their beams are
wide, giving a smooth,
stable ride. Twin hull design
produces less drag so it
requires less horsepower and
has better fuel efficiency.
The dual engines make the
boat much easier to handle.



2015 New York Safe Boating

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