Lofting a model boat hull
You have so many duplicate sketch (straight) lines immediately below the top sketch.
The work around small rectangle has no use in the Loft that does work. Sorted with your file. Your file has far too many sketch points in the profiles.
Edit the keel sketch to have only one straight line near the deck.
Use the solid face of Loft 1, to the Bow and Stern points. 3 Rails when the keel sketch is fixed.
Hi,
You seem to be working Hard not Easy. If you build from the inside out on a model,
which is the traditional way you would do it for real or a proper model, then you
will struggle to make it fit properly unless you put in a huge amount of work. There
is a better way - model outside in.
This method involves making the OUTSIDE of the model in a solid piece and then
building the insides in a step by step way. Everything fits nicely and it is much
quicker and easier.
I am more of an aeroplane guy than a boat guy but the principle is identical and I
have modelled both exactly the same way.
First, if you have three view drawings or images then set these up on your three
basic planes and scale them and use them for a guide when modelling. These
canvases are used as a Guide and make the Model much more accurately and
faster since you only have to line up with the Canvas (that is why position and
scaling is important).
The important thing here is to pick a common point and line all of the canvases up
to that point - AFTER you have Scaled them - so that everything is in the right place.
There are a number of tools to download for aeroplane wings and airfoils so getting
complex wing shapes can be pretty easy. Lofting a Boat is much easier. With the Spline
command most boat hulls can be drawn in three or four points (three is better). With
all splines less is more. The more points you have the harder it is to get smooth
geometry and often causes beginners problems.
Work Smart and not Hard. Symmetry is your friend.
Don't try to build the whole boat when drawing half works just as well. Do all the
Symmetrical bits and then Mirror it to finish it off. In this example with an aircraft simply
model one side for the same reason.
Starting with the wing, model it solid first. I used an airfoil plugin to get my basic wing.
Now that I have the basic Outside shape I can use it to create the inside stuff. In this case
the design will be a Radio Controlled Model and since it is of largish size it will need a wing
skin of about 3mm. To create the skin I simply go to the Surface Tools, create a surface of
the wing; thicken it to 3mm; then use this thickened surface as a Cutting Tool to remove this
much of my core wing Body (and Keep Tools). Now I have the Skin Body and the Core Body.
Now I need to create the Ribs and Spars of the internal structure of my Wing. In a Boat this
would be the Frames but the principle here is Identical. Start by drawing a Sketch under the
Body I want to cut. Create a long narrow rectangle that is the width of the Rib or Frame and
make sure it extends through ALL of the body you want to cut. It doesn't matter how big it is
as we are generating another Cutting Tool. Under "normal" circumstances I would not
recommend the next step but in this case it is ok because I know it is both simple and easy
and correct usage of the technique. You have a single (fully constrained) narrow rectangle.
Using the Rectangular Pattern in the Sketch, create a number of copies of the rectangular
tool at the spaces that you want your Ribs or Frames to be. It should end up looking like this.
You will notice that mine has some black and blue boxes. This is just me being lazy
and not fully constraining one of my sketches but this particular model was done a
LONG time ago and I now know much better. The important thing here is I now have
my Cutting Tools ready.
Using the Extrude Command, select all of the rectangles in the sketch, turn on the
Core you want to Cut and set the Cutting Operation to Intersect.
What you get left with is a whole bunch of thin slices of the Core, which you want,
and the rest goes away.
In this case it was convenient for me to cut the Mass Reduction holes before I did
the cutting of the Ribs. If you need this for your Boat you can do it when it is
convenient. I simply drew two sketches and Lofted between them.
You could use a similar technique for the Spars or you could Model them. For
convenience I found it easier to model them in this instance.
I have learned a significant amount about fusion since I did this Model about
four years ago. I would do some techniques differently today but I would
definitely use this method for the basic Outside In parts of the Build.
This whole process took me about 15 minutes to start a new aircraft Model; set
it up; create the basic Fuselage and the Wing with all of the internal structure.
That was MUCH faster than my initial attempt at trying to create all the internals
first and then the outside stuff.
Cheers
Andrew
Huh? I will try drafting my own paper version of the plans and importing them to
see how I get on.
What makes you think doing it twice is a beneficial tactic?
Why would you prepare paper copies of incorrect data to import and duplicate again in Fusion.
Surely using Fusion to eliminate the paper preparation is why you are drafting models in Fusion.
That said it is your Fusion work that is hindering efficiency You have this profile, mirrored the errors on one side are purposefully duplicated.
You have the beam dimension, and the draft dimension. (Top and Bottom point easy to obtain - the hard part, placing the midpoint.)
In the pic, I used the Curvature Comb Display to show that your curves have two points that fall under the ideal outline.
By comparison a 3-point spline, (deck, keel and midpoint) I traced over your work, using 3 of your points, is going to assist Fusion to produce smooth surfaces.
Smooth consistent red curves are much better than zig zaging.
A model only 2 metres long is (not) a full-sized replica? Don't place too much attention to copies of copies, basic overall dimensions are written and no need to trace.
I didn't see anything to suggest you are working inside > out, apart from the deck and keel sketches are constructed after the frames. (backwards)
Can you argue a half ellipse is not going to work?
Brighter blue curve is half ellipse connected to the deck and keel points. Comparing Frame 52 Sketch to the ellipse.
Might help...
