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Recent content by tomcad

  1. tomcad

    Calc line length block & tackle

    Where can I find a formula or calculator that will calculate the length of line needed for a 6:1 block & tackle system? For example, a 70-foot tower is lying prone and needs to be raised to the vertical. The tower pick-point is at 50-feet, the vertical pick point is at 45-feet. If, Line-1 =...
  2. tomcad

    110 m tanker

    Gents: I've been all over the web trying to find an AutoCad drawing of an ocean fuel tanker, preferably 110 meter, but I'd take what is available. No success. All I need is an overhead (plan) view. I'm doing a presentation on oil spills containment and clean-up. If you could help out, I'd...
  3. tomcad

    reducing file size

    All the above are great tips. I sometimes use this one to reduce the file size. When I start a drawing, I might save subsequent changes in a numbering sequence, a,b,c..., purging and erasing in each drawing [old ones are deleted]. I read somewhere that even though purge and erase removes the...
  4. tomcad

    Cable protection

    I am more familiar with radio electronics than salt water engineering; but here are some thoughts. The reason for salt or moisture accumulating in an open system is mainly due to temperature differentials (eg. day to night). Warm air expands, cool air draws in the moisture. So sometimes what...
  5. tomcad

    Tetrahedra

    Hi Folks: I'm trying to find a source for marine shoreline erosion control, but I'm really stuck on a specific topic. I don't know how to identify the structure I saw in use on Puget Sound last summer. It's basic shape appeared to be an open tetrahedra. The construction material was...
  6. tomcad

    Atlas Shrugged - Ayn Rand

    Dilbert (Scott Adams) contains the wisdom of the modern political corporate environment. I think a good mix of both technical and political savvy will take anyone a long way (i.e. if you can sell an icebox to an Eskimo...).
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