US20010052314A1 - Method of controlling the attitude of a boat at high speed through boat hull design and a boat hull - Google Patents
Method of controlling the attitude of a boat at high speed through boat hull design and a boat hull Download PDFInfo
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- US20010052314A1 US20010052314A1 US09/871,098 US87109801A US2001052314A1 US 20010052314 A1 US20010052314 A1 US 20010052314A1 US 87109801 A US87109801 A US 87109801A US 2001052314 A1 US2001052314 A1 US 2001052314A1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B1/00—Hydrodynamic or hydrostatic features of hulls or of hydrofoils
- B63B1/16—Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving additional lift from hydrodynamic forces
- B63B1/18—Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving additional lift from hydrodynamic forces of hydroplane type
- B63B1/20—Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving additional lift from hydrodynamic forces of hydroplane type having more than one planing surface
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B1/00—Hydrodynamic or hydrostatic features of hulls or of hydrofoils
- B63B1/02—Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving lift mainly from water displacement
- B63B1/04—Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving lift mainly from water displacement with single hull
- B63B1/042—Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving lift mainly from water displacement with single hull the underpart of which being partly provided with channels or the like, e.g. catamaran shaped
Definitions
- the present invention relates to a method of controlling the attitude of a boat at high speed through boat hull design, and a boat hull constructed in accordance with the teachings of the method.
- a first step involves forming a pair of high speed steps in the hull of the boat adjacent to the stern on opposite sides of the keel between the chines to control the attitude of the boat at high speed.
- the length of the pair of high speed steps must be not less than 10% and not more than 30% of the length of the hull.
- the width of the each of the pair of high speed steps must be not less than 20% and not more than 40% of the chine to chine width of the hull.
- the depth of the each of the pair of high speed steps must be not less than 1% and not more than 5% of the chine to chine width of the hull.
- a second step involves forming at least one pair of transition steps in the hull of the boat adjacent to the pair of high speed steps on opposite sides of the keel and between the chines to provide a transition to the pair of high speed steps.
- the length of the pair of transition steps is not less than 10% and not more than 30% of the length of the hull.
- the width of the each of the pair of transition steps is not less than 20% and not more than 40% of the chine to chine width of the hull.
- the depth of the each of the at least one pair of transition steps being not less than 0.5% and not more than 2.5% of the chine to chine width of the hull.
- FIG. 1 is a bottom plan view of a boat hull constructed in accordance with the teachings of the present method.
- FIG. 2 is a side elevation view of the boat hull illustrated in FIG. 1.
- FIG. 3 is an end elevation view of the boat hull illustrated in FIG. 1.
- FIG. 4 is an bottom plan view of the boat hull illustrated in FIG. 1, showing wetted surface area at low speed.
- FIG. 5 is an bottom plan view of the boat hull illustrated in FIG. 1, showing wetted surface area at high speed.
- FIGS. 1 through 5 The preferred embodiment, a boat hull generally identified by reference numeral 10 , will now be described with reference to FIGS. 1 through 5.
- This boat hull has been constructed in accordance with the teachings of the present method of controlling the attitude of a boat at high speed through boat hull design.
- a boat hull 10 of boat 12 with a bow 14 and a stern 16 , chines 18 , and a keel 20 .
- Boat hull 10 is characterized by a pair of high speed steps 22 in hull 10 of boat 12 adjacent to stern 16 on opposed sides 24 of keel 20 and between chines 18 to control the attitude of boat 12 at high speed.
- the length 26 of pair of high speed steps 22 is not less than 10% and not more than 30% of the length 28 of hull 10 .
- the width 30 of each of pair of high speed steps 22 is not less than 20% and not more than 40% of chine to chine width 32 of hull 10 .
- depth 34 of each of pair of high speed steps 22 is not less than 1% and not more than 5% of chine to chine width 32 of hull 10 .
- this chine to chine width is identified as “X”.
- the depth is indicated as a percentage of “X”.
- At least one pair of transition steps 36 are provided for in hull 10 of boat 12 adjacent to pair of high speed steps 22 on opposite sides 24 of keel 20 and between chines 18 to provide a transition to pair of high speed steps 22 .
- Length 38 of pair of transition steps 36 is not less than 10% and not more than 30% of length 28 of hull 10 .
- width 40 of each of pair of transition steps 36 is not less than 20% and not more than 40% of chine to chine width 32 of hull 10 .
- depth 42 of each of pair of transition steps 36 is not less than 0.5% and not more than 2.5% of chine to chine width 32 of hull 10 .
- each of pair of high speed steps 22 has a bow end 44 and a stern end 46 .
- each of pair of high speed steps 22 increases in depth 34 from bow end 44 toward stern end 46 .
- the angle is preferably between 0.5 and 2 degrees. A change in the angle has the effect of altering the amount of lift exerted upon boat 12 . Beneficial results have been obtained with an angle of 0.75 of a degree.
- high speed steps 22 will not have enough surface area 48 to control the attitude of hull 10 if length 26 of high speed steps 22 is less than 10% of chine to chine width 32 of hull 10 .
- Widths 30 of high speed steps 22 that are less than 20% of chine to chine width 32 of hull 10 are too narrow to effectively control the attitude of hull 10 .
- Widths 30 of more than 40% of chine to chine width 32 of hull 10 leave keel 20 too narrow to support the weight of hull 10 which results in high drag.
- depth 34 of high speed steps 22 is less than 1% of chine to chine width 32 of hull 10 , it results in hull 10 having a high drag.
- High speed steps 22 of depth 34 of more than 5% of chine to chine width 32 of hull 10 make it difficult to for high speed steps 22 to maintain contact with the water surface resulting in a loss of attitude control.
- transition steps 36 will not have enough surface area 48 to control the attitude of hull 10 if length 38 of transition steps 36 is less than 10% of chine to chine width 32 of hull 10 .
- Widths 40 of transition steps 36 that are less than 20% of chine to chine width 32 of hull 10 are too narrow to effectively control the attitude of hull 10 .
- Widths 40 of more than 40% of chine to chine width 32 of hull 10 leave keel 20 too narrow to support the weight of hull 10 which results in high drag.
- FIG. 2 if depth 42 of transition steps 36 is less than 0.5% of chine to chine width 32 of hull 10 , it results in hull 10 having a high drag. Transition steps 36 of depth 42 of more than 2.5% of chine to chine width 32 of hull 10 make it difficult to for transition steps 36 to maintain contact with the water surface resulting in a loss of attitude control.
- the length 26 of each of pair of high speed steps 22 is not less than 14% and not more than 22% of length 28 of hull 10 .
- width 30 of each of pair of high speed steps 22 is not less than 26% and not more than 34% of chine to chine width 32 of hull 10 .
- depth 34 of each of pair of high speed steps 22 is not less than 2% and not more than 4% of chine to chine width 32 of the hull 10 .
- length 38 of each of pair of transition steps 36 is not less than 14% and not more than 22% of length 28 of the hull 10 .
- width 40 of each of pair of transition steps 36 is not less than 26% and not more than 34% of chine to chine width 32 of hull 10 .
- Depth 42 of each of pair of transition steps 36 is not less than 1% and not more than 1.5% of chine to chine width 32 of hull 10 .
Abstract
A method of controlling the attitude of a boat at high speed through boat hull design involves a first step of forming a pair of high speed steps in the hull of the boat. The pair of high speed steps provide enough surface area to control ride attitude, while reducing the wetted area of the hull to decrease drag. A second step involves forming transition steps to provide a transition to the high speed steps as the boat accelerates. In addition to reducing drag, the method aids in turning and lifting of the hull by trapping air and water in the steps.
Description
- The present invention relates to a method of controlling the attitude of a boat at high speed through boat hull design, and a boat hull constructed in accordance with the teachings of the method.
- The North American Space Agency (NASA) conducted a study as to the optimum attack angle for a motor boat. NASA found that the optimum attack angle was approximately 2 to 3 degrees. It has been found, however, that it is difficult to maintain an attack angle of between 2 and 3 degrees as a motor boat accelerates. This is particularly the case with motor boats powered by inboard jets, as the thrust line is higher than with motor boats powered by outboard motors. A lower thrust line allows greater leverage on the hull when trimming the drive to achieve the desired ride angle of the boat. The high thrust line of the jet is not nearly as effective in this regard because as the speed of a jet boat increases, hydrodynamic pressure builds near the stern making it difficult to maintain an effective planing attitude. This results in the hull running flat which creates a greater wetted surface area. The greater the wetted surface area of the hull, the more frictional water drag occurs resulting in poor handling and a loss of control of the boat.
- What is required is a method of controlling the attitude of a boat at high speed through boat hull design, and a boat hull constructed in accordance with the teachings of the method.
- According to one aspect of the present invention there is provided a method of controlling the attitude of a boat at high speed through boat hull design. A first step involves forming a pair of high speed steps in the hull of the boat adjacent to the stern on opposite sides of the keel between the chines to control the attitude of the boat at high speed. The length of the pair of high speed steps must be not less than 10% and not more than 30% of the length of the hull. The width of the each of the pair of high speed steps must be not less than 20% and not more than 40% of the chine to chine width of the hull. The depth of the each of the pair of high speed steps must be not less than 1% and not more than 5% of the chine to chine width of the hull. A second step involves forming at least one pair of transition steps in the hull of the boat adjacent to the pair of high speed steps on opposite sides of the keel and between the chines to provide a transition to the pair of high speed steps. The length of the pair of transition steps is not less than 10% and not more than 30% of the length of the hull. The width of the each of the pair of transition steps is not less than 20% and not more than 40% of the chine to chine width of the hull. The depth of the each of the at least one pair of transition steps being not less than 0.5% and not more than 2.5% of the chine to chine width of the hull.
- According to another aspect of the present invention there is provided a boat hull that is constructed in accordance with the teachings of the present method.
- With a boat hull constructed in accordance with the teachings of the above method, the wetted surface area of the boat is less at high speed, as will hereinafter be further described. This method also aids in turning and lifting of the hull by trapping air and water in the steps.
- These and other features of the invention will become more apparent from the following description in which reference is made to the appended drawings, wherein:
- FIG. 1 is a bottom plan view of a boat hull constructed in accordance with the teachings of the present method.
- FIG. 2 is a side elevation view of the boat hull illustrated in FIG. 1.
- FIG. 3 is an end elevation view of the boat hull illustrated in FIG. 1.
- FIG. 4 is an bottom plan view of the boat hull illustrated in FIG. 1, showing wetted surface area at low speed.
- FIG. 5 is an bottom plan view of the boat hull illustrated in FIG. 1, showing wetted surface area at high speed.
- The preferred embodiment, a boat hull generally identified by
reference numeral 10, will now be described with reference to FIGS. 1 through 5. - This boat hull has been constructed in accordance with the teachings of the present method of controlling the attitude of a boat at high speed through boat hull design.
- Referring to FIG. 1, there is provided a
boat hull 10 ofboat 12 with abow 14 and astern 16,chines 18, and akeel 20.Boat hull 10 is characterized by a pair ofhigh speed steps 22 inhull 10 ofboat 12 adjacent tostern 16 onopposed sides 24 ofkeel 20 and betweenchines 18 to control the attitude ofboat 12 at high speed. - The
length 26 of pair ofhigh speed steps 22 is not less than 10% and not more than 30% of thelength 28 ofhull 10. Referring to FIG. 3, thewidth 30 of each of pair ofhigh speed steps 22 is not less than 20% and not more than 40% of chine tochine width 32 ofhull 10. Referring to FIG. 2,depth 34 of each of pair ofhigh speed steps 22 is not less than 1% and not more than 5% of chine tochine width 32 ofhull 10. In FIGS. 1 and 3, this chine to chine width is identified as “X”. In FIG. 2, the depth is indicated as a percentage of “X”. - Referring to FIG. 1, at least one pair of
transition steps 36 are provided for inhull 10 ofboat 12 adjacent to pair ofhigh speed steps 22 onopposite sides 24 ofkeel 20 and betweenchines 18 to provide a transition to pair ofhigh speed steps 22.Length 38 of pair oftransition steps 36 is not less than 10% and not more than 30% oflength 28 ofhull 10. Referring to FIG. 3,width 40 of each of pair oftransition steps 36 is not less than 20% and not more than 40% of chine tochine width 32 ofhull 10. Referring to FIG. 2, depth 42 of each of pair oftransition steps 36 is not less than 0.5% and not more than 2.5% of chine tochine width 32 ofhull 10. - Referring to FIG. 1, each of pair of
high speed steps 22 has abow end 44 and astern end 46. Referring to FIG. 2, each of pair ofhigh speed steps 22 increases indepth 34 frombow end 44 towardstern end 46. The angle is preferably between 0.5 and 2 degrees. A change in the angle has the effect of altering the amount of lift exerted uponboat 12. Beneficial results have been obtained with an angle of 0.75 of a degree. - Referring to FIG. 5,
high speed steps 22 will not haveenough surface area 48 to control the attitude ofhull 10 iflength 26 ofhigh speed steps 22 is less than 10% of chine tochine width 32 ofhull 10. Referring to FIG. 4, alternatively, there will be too muchwetted surface area 48 which causeshull 10 to run flat and results in high frictional drag iflength 26 ofhigh speed steps 22 is more than 30% of chine tochine width 32 ofhull 10.Widths 30 ofhigh speed steps 22 that are less than 20% of chine tochine width 32 ofhull 10 are too narrow to effectively control the attitude ofhull 10. Widths 30 of more than 40% of chine tochine width 32 ofhull 10leave keel 20 too narrow to support the weight ofhull 10 which results in high drag. Referring to FIG. 2, ifdepth 34 ofhigh speed steps 22 is less than 1% of chine tochine width 32 ofhull 10, it results inhull 10 having a high drag.High speed steps 22 ofdepth 34 of more than 5% of chine tochine width 32 ofhull 10 make it difficult to forhigh speed steps 22 to maintain contact with the water surface resulting in a loss of attitude control. - Referring to FIG. 5,
transition steps 36 will not haveenough surface area 48 to control the attitude ofhull 10 iflength 38 oftransition steps 36 is less than 10% of chine tochine width 32 ofhull 10. Referring to FIG. 4, alternatively, there will be too muchwetted surface area 48 which causeshull 10 to run flat and results in high frictional drag iflength 38 oftransition steps 36 is more than 30% of chine tochine width 32 ofhull 10.Widths 40 oftransition steps 36 that are less than 20% of chine tochine width 32 ofhull 10 are too narrow to effectively control the attitude ofhull 10. Widths 40 of more than 40% of chine tochine width 32 ofhull 10leave keel 20 too narrow to support the weight ofhull 10 which results in high drag. FIG. 2, if depth 42 oftransition steps 36 is less than 0.5% of chine tochine width 32 ofhull 10, it results inhull 10 having a high drag.Transition steps 36 of depth 42 of more than 2.5% of chine tochine width 32 ofhull 10 make it difficult to fortransition steps 36 to maintain contact with the water surface resulting in a loss of attitude control. - While using the percentage range described above provides an improved ability to control the attitude of
boat 12 at high speeds, more beneficial results are obtained by applying a narrower range of percentages. The benefit of the narrow range of percentages is that improved handling and control of the attitude ofboat 12 at high speeds can be obtained. Using the narrower range of percentages results in less wettedsurface area 48 onhull 10 ofboat 12 resulting in less frictional drag yet allows for enough wettedsurface area 48 for effective control of attitude of boat at high speeds. The narrower range of percentages will now be discussed with reference to FIGS. 1 through 5. - Referring to FIG. 1, the
length 26 of each of pair of high speed steps 22 is not less than 14% and not more than 22% oflength 28 ofhull 10. Referring to FIG. 3,width 30 of each of pair of high speed steps 22 is not less than 26% and not more than 34% of chine to chinewidth 32 ofhull 10. Referring to FIG. 2,depth 34 of each of pair of high speed steps 22 is not less than 2% and not more than 4% of chine to chinewidth 32 of thehull 10. Referring to FIG. 1,length 38 of each of pair of transition steps 36 is not less than 14% and not more than 22% oflength 28 of thehull 10. Referring to FIG. 3,width 40 of each of pair of transition steps 36 is not less than 26% and not more than 34% of chine to chinewidth 32 ofhull 10. Depth 42 of each of pair of transition steps 36 is not less than 1% and not more than 1.5% of chine to chinewidth 32 ofhull 10. - With a boat hull constructed, as described, the wetted surface area of the boat is less at high speed. This results in less drag. However, the steps also aid in turning and lifting of the hull by trapping air and water in the steps.
- Examples will now be describe to assist in the successful application of the teachings of the method.
- Recommended dimensions for
boat 12 having: - a
hull length 28 of 228 inches (19 feet) - a chine to chine
hull width 32 of 63inches Length 26 of eachhigh speed step 22 is not less than 10% ofhull length 28 of 228 inches=22.8 inches and not more than 30% ofhull length 28 of 228 inches−68.4 inches. Preferred is a narrower range of 14% ofhull length 28 of 228 inches=31.92 and 22% ofhull length 28 of 228 inches=50.16 inches. What is illustrated is 40 inches which is approximately 18%.Width 30 of eachhigh speed step 22 is not less than 20% ofhull width 32 of 63 inches=12.6 inches and not more than 40% ofhull width 32 of 63 inches=25.2 inches. Preferred is a narrower range of 26% ofhull width 32 of 63 inches=16.38 and 34% ofhull width 32 of 63 inches=21.42 inches. What is illustrated is 18.9 inches which is approximately 30% depth 34 of eachhigh speed step 22 is not less than 1% ofhull width 32 of 63 inches=0.63 inches and not more than 5% ofhull width 32 of 63 inches=3.15 inches. Preferred is a narrower range of 2% ofhull width 32 of 63 inches=1.26 and 4% ofhull width 32 of 63 inches=2.52 inches. What is illustrated is a slope which starts atbow end 44 at 1.5 inches which is approximately 2.4% and gradually increases in depth frombow end 44 towardstern end 46 to 2 inches which is approximately 3.2%. -
Length 38 of eachtransition step 36 is not less than 10% ofhull length 28 of 228 inches=22.8 inches and not more than 30% ofhull length 28 of 228 inches=68.4 inches. The Preferred range is a narrower range of 14% ofhull length 28 of 228 inches=31.92 and 22% ofhull length 28 of 228 inches=50.16 inches. What is actually illustrated is 41 inches which is approximately 18% width 40 of eachtransition step 36 is not less than 20% ofhull width 32 of 63 inches=12.6 inches and not more than 40% ofhull width 32 of 63 inches=25.2 inches. Preferred is a narrower range of 26% ofhull width 32 of 63 inches=16.38 and 34% ofhull width 32 of 63 inches=21.42 inches. What is illustrated is 18.9 inches which is approximately 30% depth 42 of eachtransition step 36 is not less than 0.5% ofhull width 32 of 63 inches=0.32 inches and not more than 2.5% ofhull width 32 of 63 inches=1.58 inches. Preferred is a narrower range of 1% ofhull width 32 of 63 inches=0.63 and 1.5% ofhull width 32 of 63 inches=0.95 inches. What is illustrated is a 0.75 inches which is approximately 1.2%. - Recommended dimensions for a
boat 12 having: - a
hull length 28 of 342 inches (28.5 feet) - a chine to chine
hull width 32 of 94.5inches Length 26 of eachhigh speed step 22 is not less than 10% ofhull length 28 of 342 inches=34.2 inches and not more than 30% ofhull length 28 of 342 inches=102.6 inches. Preferred is a narrower range of 14% ofhull length 28 of 342 inches=47.88 and 22% ofhull length 28 of 342 inches=75.24 inches. What is illustrated is 61.5 inches which is approximately 18% width 30 of eachhigh speed step 22 is not less than 20% ofhull width 32 of 94.5 inches=18.9 inches and not more than 40% ofhull width 32 of 94.5 inches=37.8 inches. Preferred is a narrower range of 26% ofhull width 32 of 94.5 inches=24.57 and 34% ofhull width 32 of 94.5 inches=32.13 inches. What is illustrated is 28.35 inches which is approximately 30% depth 34 of eachhigh speed step 22 is not less than 1% ofhull width 32 of 94.5 inches−0.95 inches and not more than 5% ofhull width 32 of 94.5 inches=4.73 inches. Preferred is a narrower range of 2% ofhull width 32 of 94.5 inches=1.89 and 4% ofhull width 32 of 63 inches=3.78 inches. What is illustrated is a slope which starts atbow end 44 at 2.25 inches which is approximately 2.4% and gradually increases in depth 42 frombow end 44 towardstern end 46 to 3 inches which is approximately 3.2%. -
Length 38 of eachtransition step 36 is not less than 10% ofhull length 28 of 342 inches−34.2 inches and not more than 30% ofhull length 28 of 342 inches=102.6 inches. The preferred range is a narrower range of 14% ofhull length 28 of 342 inches=47.88 and 22% ofhull length 28 of 342 inches=75.24 inches. What is actually illustrated is 60 inches which is approximately 18% width 40 of eachtransition step 36 is not less than 20% ofhull width 32 of 94.5 inches=18.9 inches and not more than 40% ofhull width 32 of 94.5 inches=37.8 inches. Preferred is a narrower range of 26% ofhull width 32 of 94.5 inches=24.57 and 34% ofhull width 32 of 94.5 inches=32.13 inches. What is illustrated is 28.35 inches which is approximately 30% depth 42 of eachtransition step 36 is not less than 0.5% ofhull width 32 of 94.5 inches=0.47 inches and not more than 2.5% ofhull width 32 of 94.5 inches=2.36 inches. Preferred is a narrower range of 1% ofhull width 32 of 94.5 inches=0.95 and 1.5% ofhull width 32 of 94.5 inches=1.42 inches. What is illustrated is a 1.13 inches which is approximately 1.2%. - Where relative dimensions of the length of the hull have been provided above, it will be understood that trim tab, drives, swim platforms, etc. are not to be included in such calculations.
- It will be apparent to one skilled in the art that modifications may be made to the illustrated embodiment without departing from the spirit and scope of the invention as hereinafter defined in the claims.
Claims (6)
1. A method of controlling the attitude of a boat at high speed through boat hull design, comprising the steps of:
forming a pair of high speed steps in the hull of the boat adjacent to the stern on opposite sides of the keel between the chines to control the attitude of the boat at high speed, the length of the pair of high speed steps being not less than 10% and not more than 30% of the length of the hull, the width of the each of the pair of high speed steps being not less than 20% and not more than 40% of the chine to chine width of the hull, the depth of the each of the pair of high speed steps being not less than 1% and not more than 5% of the chine to chine width of the hull; and
forming at least one pair of transition steps in the hull of the boat adjacent to the pair of high speed steps on opposite sides of the keel and between the chines to provide a transition to the pair of high speed steps, the length of the at least one pair of transition steps being not less than 10% and not more than 30% of the length of the hull, the width of the each of the at least one pair of transition steps being not less than 20% and not more than 40% of the chine to chine width of the hull, the depth of the each of the at least one pair of transition steps being not less than 0.5% and not more than 2.5% of the chine to chine width of the hull.
2. The method as defined in , each of the pair of high speed steps having a bow end and a stern end, each of the pair of high speed steps increasing in depth from the bow end toward the stern end.
claim 1
3. The method as defined in , the length pair of high speed steps being not less than 14% and not more than 22% of the length of the hull, the width of the each of the pair of high speed steps being not less than 26% and not more than 34% of the chine to chine width of the hull, the depth of the each of the pair of high speed steps being not less than 2% and not more than 4% of the chine to chine width of the hull; and
claim 1
the length of the at least one pair of transition steps being not less than 14% and not more than 22% of the length of the hull, the width of the each of the at least one pair of transition steps being not less than 26% and not more than 34% of the chine to chine width of the hull, the depth of the each of the at least one pair of transition steps being not less than 1% and not more than 1.5% of the chine to chine width of the hull.
4. A boat hull, characterized by:
a pair of high speed steps in the hull of the boat adjacent to the stern on opposed sides of the keel and between the chines to control the attitude of the boat at high speed, the length of the pair of high speed steps being not less than 10% and not more than 30% of the length of the hull, the width of the each of the pair of high speed steps being not less than 20% and not more than 40% of the chine to chine width of the hull, the depth of the each of the pair of high speed steps being not less than 1% and not more than 5% of the chine to chine width of the hull; and
at least one pair of transition steps in the hull of the boat adjacent to the pair of high speed steps on opposite sides of the keel and between the chines to provide a transition to the pair of high speed steps, the length of the at least one pair of transition steps being not less than 10% and not more than 30% of the length of the hull, the width of the each of the at least one pair of transition steps being not less than 20% and not more than 40% of the chine to chine width of the hull, the depth of the each of the at least one pair of transition steps being not less than 0.5% and not more than 2.5% of the chine to chine width of the hull.
5. The boat hull as defined in , wherein each of the pair of high speed steps has a bow end and a stern end, each of the pair of high speed steps increasing in depth from the bow end toward the stern end.
claim 4
6. The boat hull as defined in , wherein the length pair of high speed steps being not less than 14% and not more than 22% of the length of the hull, the width of the each of the pair of high speed steps being not less than 26% and not more than 34% of the chine to chine width of the hull, the depth of the each of the pair of high speed steps being not less than 2% and not more than 4% of the chine to chine width of the hull; and
claim 4
the length of the at least one pair of transition steps being not less than 14% and not more than 22% of the length of the hull, the width of the each of the at least one pair of transition steps being not less than 26% and not more than 34% of the chine to chine width of the hull, the depth of the each of the at least one pair of transition steps being not less than 1% and not more than 1.5% of the chine to chine width of the hull.
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CA002310554A CA2310554C (en) | 2000-06-01 | 2000-06-01 | Method of controlling the attitude of a boat at high speed through boat hull design and a boat hull |
CA2310554 | 2000-06-01 |
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WO2013154659A3 (en) * | 2012-04-12 | 2015-05-14 | Navatek, Ltd. | Planing hull for rough seas |
US9038561B2 (en) | 2011-02-03 | 2015-05-26 | Navatek, Ltd. | Planing hull for rough seas |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2006007054A2 (en) * | 2004-05-06 | 2006-01-19 | Errecalde George A | Transportation vehicle and method operable with improved drag and lift |
US20070012234A1 (en) * | 2005-07-18 | 2007-01-18 | Askew Robert A | Boat hull with roll stability at low or high speeds |
US8216007B2 (en) * | 2006-02-27 | 2012-07-10 | Steven Clay Moore | Methods and arrangements for rapid trim adjustment |
US7549385B2 (en) * | 2007-08-17 | 2009-06-23 | Hansen John F | Stepped boat hull with flat pad portions |
WO2016073874A1 (en) | 2014-11-07 | 2016-05-12 | Ocean Design Group, Llc | Marine vessel hull with a longitudinally vented transverse step |
US9365262B1 (en) | 2015-06-10 | 2016-06-14 | The United States Of America As Represented By The Secretary Of The Navy | Wiggle hull design having a concave and convex planing hull |
US10435120B2 (en) | 2017-12-20 | 2019-10-08 | Alverno Management Company | Wave riding boards |
US11319025B2 (en) * | 2019-04-18 | 2022-05-03 | Cross Step Llc | Marine vessel hull with a longitudinally-vented, partial-beam transverse step |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5452676A (en) * | 1994-07-05 | 1995-09-26 | Global Marine Performance, Inc. | Hull configuration for high speed boat |
US5819677A (en) * | 1996-07-17 | 1998-10-13 | Livingston; David T. | Hull with laminar flow interrupters |
US5986823A (en) * | 1997-03-31 | 1999-11-16 | Yang, Jr.; Peter S. | Fresnel magnifying lens for forming a hand-held pocket-sized hybrid assembly and method therefor of providing the hybrid assembly |
US6000357A (en) * | 1998-04-08 | 1999-12-14 | Allison; Darris E. | Boat planing tabs |
US6138601A (en) * | 1999-02-26 | 2000-10-31 | Brunswick Corporation | Boat hull with configurable planing surface |
-
2000
- 2000-06-01 CA CA002310554A patent/CA2310554C/en not_active Expired - Fee Related
-
2001
- 2001-05-31 US US09/871,098 patent/US6415731B2/en not_active Expired - Fee Related
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9038561B2 (en) | 2011-02-03 | 2015-05-26 | Navatek, Ltd. | Planing hull for rough seas |
WO2013154659A3 (en) * | 2012-04-12 | 2015-05-14 | Navatek, Ltd. | Planing hull for rough seas |
Also Published As
Publication number | Publication date |
---|---|
US6415731B2 (en) | 2002-07-09 |
CA2310554C (en) | 2007-05-01 |
CA2310554A1 (en) | 2001-12-01 |
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