FIT

Purpose

To allow the user to fit a series of Sections, Waterlines, Buttocks or Deck Frames.

Syntax

Description

The points for each required curve are extracted from the DESIGN directory or interpolated from stored curves and an automatic PREFIT takes place. The resultant curve is displayed on the graphics device and optionally save in the design.

FIT SECTION, WATERLINE or BUTTOCK

For orthogonal curves the FIT command is equivalent to executing the following sequence of commands:

GET 'curve specifier'
PREFIT
DISPLAY CURVE
ACCEPT

The user may fit an individual curve or a series of curves. By using the /ALL option the system will get a list of the stored curve positions and fit new curves at these positions. If USE DESIGN is in use then all curves in Design directory will be fitted.

The /CLOSE option allows the user close the curve that means, an extra point at the same coordinate as the first point is automatically inserted prior to fitting a curve to the points.

FIT WATERLINE /STEM or /STERN

This option adjusts the Waterline Endings to that defined by the End Surface. In this way the endings can be changed without altering (or fitting) the rest of the waterline. If the /POINT option is given, points are moved and generated to that, if the waterline is refitted, the resultant curve will approximate the updated curve.

FIT DECK

The FIT DECK command allows the user to fit a series of deck frames for a named Deck with a given Camber and Sheer and with or without a Gunwhale.

In order to fit decks the user must have previously created a Camber line and a Sheer line. If a Gunwhale is also to form part of the deck then it too must have been defined previously. The required Camber, Sheer and Gunwhale are selected with the USE command.

Deck frames are created by first translating the Camber line to a height defined by the Sheer line at a given frame position. Next the translated Camber line is intersected with the frame to give a deck edge point. Any points outside this deck edge point are discarded. If a Gunwhale is to be fitted then extra points will by added to ensure the correct radius. Finally a curve is fitted to the points which is then displayed and stored if required.

Transition deck Frames can be created between any two existing Deck Frames by using the TRANSITION option. In this case the user must specify the Start and End frame of the Transition piece and no intervening Deck Frames should exist. These two Deck Frames should be either Flat or Cranked to achieve a proper Transition. A Transition Deck Frame will be created at each Section which is switched ON, between the two positions. The angle at which the new Transition Deck Frames intersect the shell can be CONSTANT or VARYING by specifying the appropriate option.

Note that deck edge points are automatically stored in the POINTS BUFFER which may subsequently be used to form a deck edge curve.

FIT SAC

Fits a series of SACs where the number series specifies the draft for each SAC and the trim is constant for each SAC. If no trim is given, then it is assumed to be 0.0. Each SAC name is automatically generated by prefixing an ASCII representation of the draft height, with a given string ($W) having a maximum length of 3 characters.

Command Qualifiers

Examples