Planing boat hull

A planing boat hull having a conical contour extending from the bow portion to the stern for a distance equal to substantially one-third the length of the hull at the keel and two-thirds or more at the chine, the after section of the hull consisting of a flat surface on each side of the keel maintaining a constant dead rise angle of 12 to 18 degrees extending to the wide lipped chine, and a chine lip portion extending at the same angle as the dead rise but in a reverse direction.

BACKGROUND OF THE INVENTION 
1. Field of the Invention 
This invention relates to hull structures for boats and is more 
particularly directed to a planing boat hull. 
2. Description of the Prior Art 
The present planing boat hulls are of the V-type construction. These hulls 
have an arcuate contour extending on either side of the keel from the bow 
to the stern which effect good riding characteristics to the boat when 
planing, when moving in the direction of a head or following sea and at a 
speed for which the hull is designed. When a planing boat having a 
conventional V-hull is not planing or when moving along a quartering sea, 
its lateral stability is very poor and high impacts of the hull are 
experienced as the speed of the planing hull is increased. Also, the bow 
of the boat tends to ride at an increasing angle thereby increasing the 
impacts of the hull. Since the water flowing past the boat follows the 
shape of the hull, the spray created by the forwardly moving boat tends to 
spray in the direction of the occupants of the boat. The present invention 
intends to avoid the above indicated poor characteristics of the 
conventional V-type hulls for planing boats by providing a hull that is 
partially arcuate and partially flat whose stern is provided with an 
appropriate dead rise and chines extending about the outer edges of the 
hull of substantially equal but oppositely extending angle as the dead 
rise. 
SUMMARY OF THE INVENTION 
Therefore, a principal object of the present invention is to provide a hull 
for a planing boat whose contour is partially arcuate, namely the surface 
of a cone, and partially flat thereby increasing its lateral stability at 
non-planing speeds. 
Another object of the present invention is to provide a hull of a planing 
boat with a conical surface extending from the bow on each side of the 
keel to a position approximately one-third the length of the boat and flat 
surfaces extending to the stern on each side of the keel for the remainder 
of the hull. 
A further object of the present invention is to provide a dead rise at the 
stern of the boat of approximately 12.degree. to 18.degree. with chines on 
each side of the hull extending from the stern to the bow whose total 
width is equal to approximately 20 percent of the total width of the hull. 
A still further object of the present invention is to provide a hull of a 
planing boat having a relatively low hull impact at planing speeds in a 
quartering head or following sea, excellent lateral stability at low and 
planing speeds, relatively low hull impact at high planing speeds and 
whose spray is directed away from the hull so as not to wet the occupants 
of the boat while planing. 
With these and other object in view, the invention will be best understood 
from a consideration of the following detailed description taken in 
connection with the accompanying drawings forming a part of this 
specification, with the understanding, however, that the invention is not 
confined to any strict conformity with the showing of the drawings but may 
be changed or modified so long as such changes or modifications mark no 
material departure from the salient features of the invention as expressed 
in the appended claims.

DESCRIPTION OF THE PREFERRED EMBODIMENT 
Referring to the drawings wherein like numerals are used to designate 
similar parts throughout the several views, the numeral 10 refers to a 
hull of a planing boat constructed in accordance with my invention and 
consisting generally of a bow portion 11, stern portion 12, a keel 13 
extending from the bow portion 11 to the stern portion 12, substantially 
flat and coplanar bottom hull portions 13 and 14 symmetrically disposed on 
each side of the keel 13 extending upwardly to a chine portion--C--whose 
outer edge portion on each side of the boat 10 joins a side hull portion 
16 that likewise extends from the bow portion 11 to the stern portion 12. 
Optimum results have been attained from my boat 10 during planing and 
non-planing speeds wherein the width or beam of the boat 10 is 
approximately 1/3 of the length of the boat 10 and the deadrise, which is 
the angle formed by the bottom hull 14 with the horizontal is between 12 
degrees and 18 degrees. The keel 13 extends from the stern portion 12 in a 
horizontal position up to a position--M--which is approximately two-thirds 
the length of the boat 10, then the keel 13 extends upwardly as best shown 
by FIG. 1. 
The bottom hull portion 14 which consists of symmetrically disposed flat 
planes extending from the keel 13 to the chine portions--C--and to the 
rear edge portion of the bottom arcuate hull portion 15. The botton hull 
portion 14 known as the delta area--D--contacts the water during the 
planing of the boat 10 to provide the boat 10 with a minimum of water 
resistence and good stability. The bottom hull portion 14 or delta 
area--D--engages the chine portions--C--at the stern portion 12 and 
extends forwardly for a distance less than one-third of the length of the 
boat 10 as at--Y--where the delta area--D--engages the bottom hull portion 
15 to position--M--. The botton hull surface 15 is arcuate, namely the 
curved surface of a cone and called the conic area--A--. The apex of the 
cone whose surface the conic area --A--is a segment of is determined as 
follows: a vertical plane --VP--positioned rearwardly of the bow 11 a 
distance of approximately one-tenth the length of the boat 10 as at--K--, 
intersects at right angle a horizontal plane passing through the keel 13 
indicated as at--X--in FIG. 1 and is extended a slight distance 
therebeyond. A second plane--HP--extends between the positions--Y--of the 
chine portions and position --M--and intersects the plane--VP--at 
position--P--the center of which is the apex of a cone forming the arcuate 
surfaces of the conic area--A--. The conic area--A--is in contact with the 
water only when the boat 10 is at less than planing speeds or when engaged 
by waves. 
The chine portions--C--are of constant width throughout the length of the 
boat except at the bow 11 where they taper or converge together as best 
shown by FIG. 2. 
The total chine width is approximately equal to one-fifth the width of the 
hull 14, 15 at the beam. The chine portions--C--extend from the outer 
edges of the bottom hulls 14 and 15 in a horizontal portion 20 joined at 
their edge portions by a downwardly inclined chine lip portion 21 
extending at the same angle as the dead rise, namely 12 to 18 degrees but 
in a reverse direction. The chine lip portion 21 forms the bottom edge of 
the side hull walls 16. The wide chines --C--assists in dampening the 
lateral roll of the boat 10 when at rest and also directs spray away from 
the boat when the boat 10 is underway. The reversely directed chine lip 
portion with its 12.degree.-18.degree. reverse angle tends to direct the 
water slightly inwardly in a manner so as not to interfere with the 
optimum performance of the hull and yet tends to keep the water from 
riding over the chine area and up the sides of the hull. However, when the 
boat 10 is planing, the chines--C--will be sufficiently out of the water 
so that they cannot impact, but will limit the lean entry into a wave, so 
as not to bury up too far into the wave which otherwise would cause the 
boat 10 to broach. The roundness of the conical area 15 also cushions the 
riding characteristics of boat 10.