First, let’s set the Frame of Reference (FOR), zero point and insert a Grid:

Ø  Set the DWL to 3.5 m above the Baseline and set the Aft and Fwd perpendiculars in the Frame of Reference Dialog.

Ø  Set the zero point to Aft Extremity and Baseline.

Also make sure the Locked Zero Point check box is unchecked so that the zero point will change with the aft perpendicular if it is moved. In case you don’t quite remember the steps to doing this, please see Design Preparation – Procedures on page 18 of this training manual.

Ø  Insert a Grid of 12 sections, 5 waterlines and 4 buttocks all evenly spaced along the length, depth and width of the model respectively.

Ø  Save your design as Bonding_Refinements.msd

Next step is to shape the forefoot in the Profile window.  First we must set the flexibility of the Topsides and Hull Bottom surfaces to 3, to do this there must be at least 3 rows of control points in each surface:

Ø  Switch to Body Plan view and Hide the Net, Display | Half, turn Sections off.

Ø  Use the control box to select the Aft-most column of control points:

Ø  Add a middle row to the Bottom and the Topsides surfaces:

Ø  Now set the transverse flexibility values to 3 of the Topsides and Bottom.

Notice that in the Transverse direction, the stiffness of the Chine and the Topsides and Bottom do not have to match. This is because the surfaces are not bonded along an edge in the Transverse direction.

Ø  Switch back to the Profile view.

Ø  Shape the forefoot by moving the Control points to positions that give the required shape.

Tip: In order to get a smooth transition across the Lower Fwd Bottom corner control point, you have to make sure that the two adjacent edge control points and the corner control point are all on one line. Also: when shaping in the Profile and Plan views it is usually helpful to compress the view  :

Ø  Continue shaping the bow and as well as the Chine Profile so that it looks like this in compressed Profile view:

Ø  Check your work in Perspective view:

Ø  Save your design as Bonding_Refinements.msd

Currently the Topsides are wall sided. Best way to change that is in Body Plan view:

Ø  Switch to Body Plan view, Hide the Net and turn Sections off

Ø  Starting from aft, use the Control Box to move the control points in each column and give the Topsides an outward slope:

Giving the Topsides some outward slope in Body Plan.

Ø  Save your design

Ø  Switch to Plan view, hide the waterlines and display the Net

Ø  Clean up any Zigzags and turn them into Bananas, especially in the bow area:

Zigzags in Plan view with Compressed view turned on

Better: bananas towards the bow

Remember that, even though the shape of the design may not change that much, improvements to the control point net will improve the fairness of the underlying surface. See Fair Net Equals Fair Surface on page 18 of this training manual for some reminder information.

Ø  Check your work in Perspective view and the other 2D view windows.

Remember that modelling is an iterative process and you may therefore want to make several runs through the Profile à Body Plan à Plan à Perspective views etc.

Finally we will see one of the nice things about bonding:

Ø  Insert a column of control points in Plan view in the Topsides surface in the bow area:

Inserting a control point column across bonded surface edge will affect all bonded surfaces

Ø  Click OK

Notice that the control point column has been inserted in the Chine and Bottom surface as well. Another change that will be applied to all surfaces is a change to Surface stiffness.

Ø  Check the stiffness settings for the Bottom surface

Ø  Increase the longitudinal stiffness to 5 for the Topsides surface

Notice that the longitudinal stiffness for the Bottom surface has automatically been increased to 5 as well.

Ø  Save your design as Bonding_finish.msd

Congratulations! You have finished the Bonding tutorial. You should have learnt from this:

§   In order to be able to bond two edges they must share the same number of control points and degree of stiffness.

§   When bonding, the 2^nd edge you select moves on top of the 1^st edge you select.

§   Duplicating a surface is a quick way to ensure that both surface edges to be bonded share the same properties.

§   After bonding, all bonded surfaces are treated more or less as one surface.