The trick: For a standard-rate turn (2 minutes for 360°), the radius in nautical miles is your speed in miles-per-minute, squared, divided by 9.

• mpm = TAS ÷ 60
• radius (NM) = mpm² ÷ 9

Worked example: TAS 180 kt → mpm = 180 ÷ 60 = 3 → radius = 3² ÷ 9 = 9 ÷ 9 = 1 NM. Speed up to 360 kt and mpm jumps to 6, so radius = 36 ÷ 9 = 4 NM — double the speed, four times the radius.

How to play. Each round is 12 questions. Start with CADET mode — just turn the TAS into miles-per-minute (divide by 60). Once that's automatic, move to PILOT for the full turn-radius calculation. When the trick is second nature, try TOWER — faster jets and edge cases, against the clock with a bonus for the high stuff. Beat the top 10 and you'll be invited to add your callsign to the leaderboard.