Classifications

• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
  • Y02T70/00—Maritime or waterways transport
  • Y02T70/10—Measures concerning design or construction of watercraft hulls

Definitions

• Applicant has determined that very fine entry bows with defined limitations on the angle of the divergence of the multiple supporting hulls greatly aids ride qualities of his invention. It was found that divergence angles of less than twenty-six (26) degrees of the recess side eels and of the sides of the multiple supporting hulls are necessary for good ride qualities with angles of less than nineteen (19) degrees actually preferred. This is described and defined in some detail in this application covering the instant invention.
• German patent DE 3813-105-A shows a non-pressurized air cushioned catamaran side hull that has a series of parallel transverse steps in its undersurface that trap air bubbles.
• DE 3813-105-A has longitudinally parallel ridges (sidekeels) , certainly not the lower sidehull surface wave slicing diverging sidekeels of applicant's instant invention.
• DE 3813-105-A does not have a recess aft seal that, as seen in a vertical transverse plane of the sidehull, is angled to vertical over a majority of its width as is an important feature of applicant's instant invention to insure best ride qualities in rough seas. Sundquist, U.S.
• a related object of the invention is that with the bow of a supporting multihull submerged by a defined angle as a function of waterline length, there is a clear limitation on the divergence angle going aft from the bow of recess sidekeels from each other and of the sides of the supporting multihull from each other for acceptable rough water ride qualities. Twenty-six degrees is considered an upper limit with twenty degrees a better comfort level limit.
• the recess aft seal preferably has a shape that is angled to horizontal over a majority of its width.
• FIG. 1 presents a bottom plan view of a catamaran version of the instant invention showing the fine entry of the recess as well as the chine area at the bow.
• Other features of the invention including sidesteps and a downwardly extending pylon used to provide clean water to a waterjet propulsor are also shown.
• FIG. 8 is a cross section, as taken through line 8-8 of FIG. 1, that shows a forward portion of a downwardly extending pylon upstream of its waterjet propulsor water inlet.
• FIG. 1 present a bottom plan view of the invention hull 30 that shows a catamaran arrangement with two supporting hulls 46. Note the fine entry bows of these hulls that are essential for good ride qualities in rough seas. Note also the fact that each supporting hull 46 is essentially boat shaped with more narrow bows 49 than sterns 44 and separated from each other by connecting structure or wetdeck 50. Note that, while not shown, more than two supporting hulls can be used with one additional hull on the main hull centerline 41 an attractive arrangement. Additional supporting hulls to those shown can be either with a gas cushion recess as shown in the catamaran supporting hulls shown here oar as more standard hulls less a gas cushion recess.
• the A waterline 51 uses a four and six tenths (4.6) degree angle which corresponds to an eight (8) foot wave at the bow.
• FIG. 2 also shows that the sidehull water deflecting steps 37 are, at least in their majority, inset into the sides of the hull, and further are oriented more vertically than horizontally over their forward portions.
• the total average divergence angle of a supporting hull's outside surfaces 57 from each other over a forward enlarging portion 58 of a supporting hull is defined as occurring over a forward enlarging portion 58 that goes aft from a supporting hull's bow 59 to where said forward enlarging portion 58 reaches a substantially maximum width.
• Angle E is the total divergence angle of the recess sidekeels and is defined as being less than 26 degrees with less than 20 degrees preferred also.
• Angle D is the partial angle as measured from a vertical centerline plane 42. Note that angle D does not have to be one half of angle E and angle F does not have to be one half of angle G as the supporting hulls can be nonsymmetrical in some situations. Note also that it is a preferred embodiment of the invention that the divergence of the secondary hull sidekeels shall occur over more than twenty-five (25) percent of said secondary hull's waterline length and then become more parallel.
• FIG. 6 is a similar view to that given in FIG's 4 and 5 but for the A waterplane 56 where the supporting hull bow is most deeply submerged.
• the defining angles for the K total divergence angle is a maximum of 26 degrees with the preferred being a maximum of twenty (20) degrees for best ride qualities.
• FIG. 7 presents a cross section, as taken through line 7-7 of FIG. 1, that shows details of the gas cushion recess aft seal 35 in its preferred invented-V configuration. Also to be noted are portions of the waterjet propulsors 32.

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• Traffic Control Systems (AREA)
• Filling Or Discharging Of Gas Storage Vessels (AREA)

Applications Claiming Priority (1)

Publications (2)

Family

ID=22268344

Family Applications (1)

Country Status (2)

• 1998
  • 1998-11-20 CA CA002330584A patent/CA2330584A1/en not_active Abandoned
  • 1998-11-20 EP EP98959538A patent/EP1062149A4/de not_active Withdrawn

Non-Patent Citations (2)

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