A sign of the consistency of the surface sections.

From the method of matching sections through oblique projections, the following sign of consistency of surface sections follows: if the projections of the frame and the waterlines intersect at points belonging to the corresponding control axes, then the frame and the waterlines are matched in kind. On the contrary, if these points do not lie on the corresponding control axes, then there is no consistency.

Let's consider the use of an oblique projection in the construction and alignment of sections of the hull. The initial elements of the shape are given (in two projections): the cargo waterline of the GVL, the deck line of the VP of the zero batox and the line along the frames. As usual, we divide the length of the vessel into 20 equal parts on a given hull and consider the construction of a frame corresponding, for example, to the third division. To do this, we will depict on an enlarged scale the part of the hot water supply specified in the figure.

The bc line is the projection of the BDG waterline onto the frame plane, while the bde curve is the projection of the same line onto the GWL plane. In order to be able to distinguish one line from another, we had to introduce the special term "control axis" for the straight bc.

Let's assume that, based on the construction of the frames, the average ordinate BF of the third frame is found; then the rectangle with sides BF and BE (where BE is the amount of precipitation) has an area equal to the area of the frame in question. The segment DE is obviously equal to the ordinate of the GWL corresponding to the third frame; we construct on this segment and on the segment BE (as on the sides) a rectangle DEB and draw its diagonal CE. We will replace the rectangle with sides BF and DE with an equal-sized quadrilateral BGDE, where point C is constructed according to I. A. Yakovlev. One of these points C is the intersection point of the diagonal GE with a straight line passing through the point F parallel to the line BE.

Now let's construct a point K where the line of the frame in question intersects with the deck line shown in the figure. To do this, we measure its ordinate y and its application Z and build, as shown, the desired point K of the frame.

Having a BCDE quadrilateral and a point K of the frame, we build, as usual, a frame of the desired shape, on which we apply a grid of control axes, the distance between these axes is equal to the distance between the planes of the waterline, and their number is equal to the number of the same waterlines. Each control axis is indicated by the number of the waterline to which it corresponds.

Let's assume that all 20 quadrilaterals equal to the corresponding frames are constructed in this way. Based on the shape of these quadrilaterals, as well as the existing (third) frame, we draw all the other frames. Tutustu sivustoon Zet casino ja aloita pelaaminen tänään.