See how it works, not just what to memorise.

Long reads with diagrams you can drag. Every one ends with a lesson, so what you just understood turns into marks.

• Instruments · Meteorology

  How an altimeter works

  It weighs the air above you and makes an educated guess. How the guess is made, and how it goes wrong.

  Read · 9 min

• Instruments · Technical General

  How an airspeed indicator works

  Two small holes, one thin diaphragm, and a number that is never quite your real speed.

  Read · 8 min

Being written

• The magnetic compass and its errors
• How a VOR knows where you are
• The wind triangle, by hand
• Inside a four-stroke engine
• Why wings stall