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[craig_c]

OK Guys,

Here's something I feel is a gaping hole in the "how-to" information available: photo-interpretation / photogrammetry.

Much of the research I have been doing recently turns up information that assumes

1)   You have high quality stereo photographs.
2)   Fairly powerful computer systems and
3)   At least a few thousand to spend on software.

No one talks about the basics.

I would like to see a good tutorial on how to take photographs and use them to create drawings we can model from without using a computer. 

Let’s assume that all we have is:

1)   Pencils
2)   Paper
3)   A few drafting tools… Triangles, straight edge and if we are lucky; proportional dividers and maybe a small drafting table.

Personally, the projects I am looking at are the M80 Stiletto and the Sea Jet (AESD). 

[Umi_Ryuzuki]

I can do it, but how do you explain "how to do it"?

Using the four orthagonal views, the plan view will give you the width of each frame at any given point. The side view will give you the height of each frame at any given point. And you have to extrapolate the front and stern views though the length of the boat.

To start with draw matching lines across the plan(top)view, and side view of the drawings. Then I would draw a waterline across the side view for reference.  On your paper for drawing the frames, also draw a "waterline and a centerline. The top and bottom of each frame are then drawn in with the proper relation to the waterline, and the width to centerline. Start at the widest part of the boat, and work toward either end. Narrowing or shortening each frame drawing proportionally to your plan and side views.

  I hope that helps, as I am confident I can do this, just not how to explain how I do it....

From perspective views, it becomes more like a jigsaw puzzle.
extrapolating a known dimesion across the perspective to get rough dimensions, and
comparing the results with overall dimensions that are often stated somewhere in the specifications.
From the specifications, you can box in the "extents" of the ship to be drawn, and then begin
extrapolating assumed proportions into the limits of that box. ... Again - 

 

Norgale is doing this here...
http://www.rcgroups.com/forums/showthread.php?t=882793
 

[craig_c]

Thanks Umi,

I'll try and make it happen... 

Don't know how well I'll do

[dougal99]

There is a good bit about this in 'Ship Modeling from Scratch' by Edwin B Leaf published by McGraw-Hill. ISBN 0-07-036817-1. Good on perspective but nothing on hull lines, especially below the waterline. But then how many phoros show them? 

HTH

Doug

[boatmadman]

Craig,

You could use free ship design software here:

http://www.delftship.net/

Ian

[Umi_Ryuzuki]

Never really looked into the DDg - 1000, but here are some profile and plan views.

Also something I made up last night from a civilian version of the M-ship 

[craig_c]

Thanks again Umi!  You're the greatest!   

[Umi_Ryuzuki]

Thanks again Umi!  You're the greatest!   

Well, I should confess, that I cheated, and used a computer to manipulate the
lines of the M-ship.    I squashed, cut and pasted the lines to get the cat hull.
You can see the original lines here...

http://www.virtualacquisitionshowcase.com/docs/2007/MShip-Brief.pdf

[craig_c]

LOL!!  If it works, it ain't cheatin'!   

 

[TCC]

If you have good beam and/or end on photos, you could do what artists do when painting a large mural on a wall from a small artwork... namely draw a grid acros each each [artwork and wall) with the same numbers of boxes down and across, then it's a matter of transferring the lines across.

You can take that fursther by sub-dividing each box up into 10 x 10 for small details.

It'd be labourious but it depends how desperate you are.