How to calculate using Breitling Navitimer slide rule

How to calculate using Breitling Navitimer slide rule
Breitling Navitimer slide rule is a complex tool to understand, hope this video helps
#breitling #navitimer #sliderule
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[@semeradstephan]

Minute 2:53, If you travel 400 Miles with a speed of 150, that is (400 / 150 ) * 60 = 160 Min not 16 min. Really confused me there :) Otherwise great video, explaining it very good.

[@secwatchcontrolroom7944]

You add an 0 as he aligned 40 (as in 400)

[@miguelborrego2699]

Honestly, I still can't understand this slide rule on the bezel, to me, any number around could be the answer.

[@seppohelle5244]

When you turn the bezel, you can think about it as setting a relation, or a multiplication factor. The relation between the inner and outer scale remains constant around the whole bezel - that is the main thing to understand. If you align 10 with 20, you set a relation of 1:2 and you see it everywhere: 30 is aligned with 60, 45 is aligned with 90 and so on. You really have all answers to multiplication or division by 2 right there, you just have to look for the numbers on the scales. Often there is no need to think about division or multiplication operations at all. Say, you have travelled 120 miles in 35 minutes. You align 12 with 35 (You have to keep track of the order of magnitude as there are only numbers from 10 to 100), and you have set the speed. You'll find the speed in miles per hour at 60 (one hour is 60 minutes), which shows about 20.5, meaning 205 mph. And you can now find all answers to questions like "how far will we be in 55 minutes at this speed", or "how long does it take to travel 550 miles at this speed" just by looking at the scales. With a calculator you have to type in numbers for each individual calculation.