US3158125A - Hull shape and a method of drawing a hull of said shape - Google Patents

Hull shape and a method of drawing a hull of said shape Download PDF

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Publication number
US3158125A
US3158125A US107166A US10716661A US3158125A US 3158125 A US3158125 A US 3158125A US 107166 A US107166 A US 107166A US 10716661 A US10716661 A US 10716661A US 3158125 A US3158125 A US 3158125A
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United States
Prior art keywords
hull
lines
line
frame
shape
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Expired - Lifetime
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US107166A
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English (en)
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Malmberg Nils Johan
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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

Definitions

  • the present invention relates to building of vessels and boats. More particularly, the present invention relates to a hull the surface of which has a special shape, and, further, it relates to a method of designing or drawing a hull of said shape.
  • vessels which are designed to be plated with metal sheets, plywood or sheets of other materials, have been shaped in such a way that the frames are designed using straight lines, in order to make it possible to carry out the plating work using single curved sheets instead of double curved sheets.
  • This makes the plating work easier, of course, but has the drawback that the shape of the vessel becomes less nice looking and ungainly.
  • These hull shapes are very common, especially in connection with small wrapped plane bottom vessels or the so-called V-bottom boats. When in such boats the sheets to form the bottom between the keel and the chine are bent, said sheets have the tendency to take a convex or concave frame shape, although the bottom part of the boat has been shaped with straight frame lines.
  • the used expression double curved surface indicates a surface of such a shape as for instance a sphere, While the cylinder for instance represents a single curved surface,
  • the frame line is the intersectional line between the frame plane and the hull surface.
  • One of the embodiments of the invention consequently is a hull surface, preferably the whole hull side, which is of such a shape that it intersects the frame planes in curved lines. Additionally it is bent to connect to the curved railing line and chine in the length direction of the vessel over straight lines included in the hull surface, which is single curved according to said intersectional lines between the hull surface and the frame 3,l5,l25 Patented Nov. 24, 1964 lCe planes, and which straight lines have an inclination in relation to the frame planes depending upon the curvature of the railing line andthe chine.
  • Another aim of the invention is also to disclose a method to be used in the designing work in order to determine said inclined straight lines in such a way that they are laying in the single curved hull surface chosen according to the frame curvature.
  • the intersectional points of the straight lines with the railing line and the chine thereafter can be correctly marked on the hull side plate or sheet and this thereafter easily can be bent over these straight lines to connect with the railing line and the chine.
  • a single whole or monolithic side sheathing formed according to this method therefore as a matter of fact easily can be formed as a single curved surface in spite of the curved frame line, which makes the work at the shipyard considerably easier than before.
  • FIG. l is a side view of an embodiment of the hull surface of the present invention.
  • FIG. 2 is a bottom view of the embodiment of FIG. 1;
  • FIG. 3 is a front view of the embodiment of FIG. 1.
  • the designer selects, as usual, the desired curvature of the frame line, and must then ix different points of the straight lines between the railing and the chine, over'which lines the hull plate has to be bent. Some of these lines have been marked on the drawing in using the marking 11 to 120.
  • the hull consequently has to be formed in such a way that from the railing always can be drawn against the frame planes inclined straight lines, for instance the lines l1 to 120, which are laying in the hull surface. According to this method a plate of plywood sheet can be bent to the hull shape along the bending lines 11 to 120 without becoming double curved.
  • the geometrical condition for a straight line to be ineluded in the hull surface is that the distance from an intersectional point on the straight line with an assumed water line of the hull surface has the same distance from the centre plane f-g in FIG. 2 as well as in FIG. 3.
  • the intersectional lines ofthe hull with the frame planes 0 9 and the Water line planes w11 to w14 are adapted to each other in the common way.
  • the inclined straight lines 11 to 120 have to be adjusted to the frame lines as well as to the Water lines.
  • all the straight lines 11 to 12o have been adjusted to the frame lines -a and the water lines w11 t'o w14 in the same way as the line 118 chosen as an example.
  • the distance h from the centre plane f-g to the -intersectional point c V(located in the water line plane) between 118 and w13 is the same in FIG. 2 and FIG. 3. This means that the point' c is laying in the hull surface. In the same way the distance of the intersectional point b of the line 113 and w14 from the centre plane f-g is the same in FIG.
  • Water lines w11 to w14 and the lines 11 to 120 to each other can be managed in such a way that the angles al to x20 continuously change, these angles being those under which the extensions of the lines 11 to 12 are crossing an arbitrary line z'-j. This has been made in the'same manner for all the lines 11 tolgo as for the line 118. From the intersectional point k between the extension of the line 118 with the line z'j there has been determined aperpendicular distance k-l, which chosen in a convenient length measure, for instance millimetres, numerically corresponds to the degree number of the angle uw.
  • the hull need not necessarily be completely Vshaped according to the invention and, consequently, if desired only certain parts of the hull surface, such as, for example, the fore part of a ship, may be shaped according to the invention.
  • a hull surface having a bow portion, a stern portion and a keel portion extending from said bow portion to said ⁇ stern portion, a center pla-ne extending substantially vertically through said keel portion, -a-plurality of frame planes intersecting said center plane at right angles, a chine and a railing, said hull surface ⁇ comprising a single curved surface including a plurality of straight lines Wholly within said curved surface extending from said chine to said railing at an inclination t'o said framevplanes, said single curved surface intersect-ing said frame planes in curved lines and being bent at said plurality of straight lines to connect said chine with said rail.
  • a hull surface having a bow portion, a stern portion and a-keel portion extending from said bow portion vto saidstern portion, a center plane extendingsubstantially vertically through said keel portion and a plurality of frame planes intersecting said center plane at right angles, said'hull surface comprising a single curved surface including a plurality of straight lines wholly Within said curved surface at an inclination -to said-frame planes,V
  • said single curved surface ⁇ intersecting said -frarne planes in curved lines and being bent at said plurality of straight lines.

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  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Earth Drilling (AREA)
US107166A 1960-05-02 1961-05-02 Hull shape and a method of drawing a hull of said shape Expired - Lifetime US3158125A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FI600771A FI44990C (fi) 1960-05-02 1960-05-02 Laivan tai veneen runkomuoto

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US3158125A true US3158125A (en) 1964-11-24

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US107166A Expired - Lifetime US3158125A (en) 1960-05-02 1961-05-02 Hull shape and a method of drawing a hull of said shape

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US (1) US3158125A (US06373033-20020416-M00035.png)
FI (1) FI44990C (US06373033-20020416-M00035.png)
SE (1) SE307307B (US06373033-20020416-M00035.png)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5488918A (en) * 1991-05-02 1996-02-06 Fontain M. Johnson Optimized barge bow form and methods of use thereof

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2288490A (en) * 1939-03-25 1942-06-30 Scott-Paine Hubert High-speed motorboat
GB809325A (en) * 1954-03-08 1959-02-25 Burness Corlett & Partners Ltd Improvements in ships hulls with conical surfaces
US2915031A (en) * 1955-04-29 1959-12-01 Leslie H Johnston Modified v-bottom boat
US3040687A (en) * 1958-08-11 1962-06-26 Higgins Inc Boat bottom

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2288490A (en) * 1939-03-25 1942-06-30 Scott-Paine Hubert High-speed motorboat
GB809325A (en) * 1954-03-08 1959-02-25 Burness Corlett & Partners Ltd Improvements in ships hulls with conical surfaces
US2915031A (en) * 1955-04-29 1959-12-01 Leslie H Johnston Modified v-bottom boat
US3040687A (en) * 1958-08-11 1962-06-26 Higgins Inc Boat bottom

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5488918A (en) * 1991-05-02 1996-02-06 Fontain M. Johnson Optimized barge bow form and methods of use thereof

Also Published As

Publication number Publication date
SE307307B (US06373033-20020416-M00035.png) 1968-12-23
FI44990C (fi) 1972-02-10
FI44990B (US06373033-20020416-M00035.png) 1971-11-01

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