Capacity and speed of thought.
Flying an aeroplane is one thing. Operating it as a weapons system something entirely different. My laissez-faire approach ('we've lost an engine ... Fine, got another one and 20,000ft to play with') was never going to see me barrelling down a valley at 200ft and 420 kts!
Next time you're driving down the motorway together try chucking a few random mental arithmetic questions (how long to destination at current speed etc) at him or asking him what was on the last road sign you passed. Very unscientific, but might give you an idea.
Last edited by Melchett01; 27th Aug 2017 at 18:16.