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I have got a plan drawing of a Nieuport 12 which reads Scale 3/4” = 1’ -0”   Can anyone assist in what I should do to photocopy the image down to 1/72nd please? Is there a mathematical way of doing this conversion?

Cheers PT

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The method of calculating this is used in drafting and CAD and involves what's called the scale factor.  It's actually pretty simple.  Here's how it works;

• The scale you're converting from is 3/4" = 1' 0".   Take the 3/4 scale and reverse it to get 4/3.  Now multiply that result by 12.  That gives you a scale factor of 16.
• Now do the same thing for 1/72.  But keep in mind, 1/72 is in inches and of course there's 12 inches in a foot so you need to make the scale factor calculation be (72/12) * 12.  That gives you 72.
• The drawing must get smaller so we divide the larger scale factor into the smaller one.  16/72 is 0.2222.  Multiply that by 100 to get a percentage.  So, your copying scale percentage would be 22.2222%.

It sounds more complicated than it really is.

Hope this helps!

Edited by uncletommy

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Thanks, this is helpful 