I used to fly with a co-pilot who, upon reaching top of climb, would twist his fancy Breitling watch bezel, and proudly announce to all in earshot that...we will descend at precisely 116 DME.
Fine.
Except that ATC would throw a wrench into the mix, and state that descent should start at 100 DME.
Whoops, descent profile out the window, so it was max speed brake for this guy, followed by added power at FL060, simply because he could not understand energy management.
When I suggested...close the taps at 100 DME and adjust the VS so as to arrive at 30 DME at FL100, 250 knots, it all worked out much better.
Some folks listen (and learn)...some don't.
Aeroplane...Lockheed tri-motor.
A fine machine.
