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  1. #1
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    Default When CAD Software Is Not Published Yet

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    I wonder what engineer used to create the 3D model of complex shape that uses surface modeling technique such as to create an airplane when a CAD Software such as Solidworks, Catia, etc., is not yet published. For example, in the year of 1945. How they create an airplane in this year without a computer?

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    Quantum Mechanic BIGAL's Avatar
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    It was called a slide rule.
    A man who never made mistakes never made anything

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    Read this about Computers in aviation.

    http://www.centennialofflight.net/es...ers/Tech37.htm
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    Quote Originally Posted by BIGAL View Post
    It was called a slide rule.
    What is slide rule?

  5. #5
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    Quote Originally Posted by basty View Post
    What is slide rule?
    Little known fact: one of the advantages of the Internet is the ability to find information on topics you know nothing about.

    http://web.mit.edu/2.972/www/reports...lide_rule.html

    http://www.npr.org/sections/ed/2014/...an-on-the-moon

    http://www.hpmuseum.org/srinst.htm
    Last edited by ReMark; 21st Mar 2016 at 11:35 am.
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    CAD is basically Math for dummies You can define everything we do with math, it just used to be a whole lot harder. Oh yeah and google ^
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    Quantum Mechanic BIGAL's Avatar
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    The chinese had a abacus way before a slide rule.

    Now where did I put my slide rule.
    A man who never made mistakes never made anything

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    Quote Originally Posted by basty View Post
    How they create an airplane in this year without a computer?
    Pencils, paper, set squares, slide rules, log tables, and of course brains.

    I remember I was just getting proficient with a slide rule when they brought out these new 'electronic calculator' gizmos making slide rules obsolete.

    I saw (a 1970's plastic) one at an auction recently described as 'vintage scientific instrument'.
    Makes you feel old. (or vintage maybe).

    Remember log tables?
    Every schoolkid had their own set, if you showed kids a set now they would probably think its a railway timetable of some sort.
    *** Out of Beer Error ->-> Recovering Memory***

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    back in the days that I was a stress engineer we had computers but no modelling software. I had to define the surface of a rotating object giving x, y & z locations, each one located using trigonometry. We had pocket calculators (for people with very deep pockets) so didn't have to rely on "guessing sticks" - although my boss did still use an adding machine. Once we had all the punch cards prepared they would be fed in to a computer which would then produce an image on paper so you could check for anything out of place. Often this came on many feet of paper because one value was out by one order of magnitude.
    "That's it. It's one thing for a ghost to terrorize my children, but quite another for him to play my Theremin." Homer Simpson
    "Everything in drafting is logical. Except what isn’t." - Gavin Guile. (from the Lightbringer series of books by Brent Weeks)

    Dave

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