Originally Posted by
BoredwLife
If you want an example of performace take you A/C up to 11,000 feet and slow to your rotation speed and add full power and try to climb. That is the exact same performace you will see trying to climb out just slighly better.
See what you're saying, but I'm not sure if that's the best way to illustrate the point.
Even at a high DA airport, on the take off you STILL have energy and momentum going forward.
In your example, you are slowing the aircraft, decreasing energy, then trying to reverse that momentum and energy. There is the additional energy being consumed trying to reverse the trend, further decreasing the climb performance.