Thomas Borchert writes:

Can't follow you there. That's as useful a statement as "airplanes tend to
be stationary objects..."

In a turn, a portion of the lift produced by the wings must be used to
accelerate the aircraft laterally, and this portion of the lift is no longer
available to maintain the aircraft's altitude. Thus, without any adjustment
of pitch or power to compensate, any turn will result in a loss of altitude.

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