Matt Colie wrote:

cavelamb himself wrote:

Matt Colie wrote:

cavelamb himself wrote:

I thought I was a pretty good draftsman.
At least until I tried lofting hull shapes...
Buildings, machine parts, entire aircraft - no problems.

But fairing a hull can be a humbling experience.

Well, for grins and giggles, here are a few of my efforts so far.

http://www.home.earthlink.net/~cavelamb/draft.htm

Richard



Well Richard,

This is no surprise to a third generation boat builder.

The pictures look pretty good.

It that first one your design?

I don't like working with a baseline other than zero draft because I
always get screwed up doing the TPI, trim and stability calculations.

It does get a little easier when working on the lofting floor at full
scale. The you can go back and correct the offset table.

Matt Colie


It's (supposed to be) a Catalina 27.

Gee, I though it looked real familiar.
Matt


I had this lame idea I was going to try when I pull my boat out
for the winter. But I can't bring it home because it's too
tall for the city standards, so I dunno now.

Anyway, the idea was to level the boat and use a few laser levels
to pick off the frames shapes.

Set up the lasers so as to draw a vertical line every 2 or 3 feet and
one horizontally at the water line.

Add a couple of vertical lines to pick off the buttlines too (side shot).

Take a digital photo - one front - one aft with the "waterline"
reference at the same height on my tripod...

Load the photos into CAD and trace off the frames.

I can't capture the waterlines that way, but the buttlines and frames
should be enough to get a fairly accurate start....

Should work ok, don't ya think?


Richard