[Crumpp]

The correct way to to calculate the effect of the weight to speed is to calculate the change of the induced drag due to changed Cl and find the new balance between thrust and the drag by iteration method.

I assure, we are using the correct BGS Algebraic formulation to predict performance in the event of a weight change.

Credit to John E Lewis and Charles E Dole:

A former Marine, the late CHARLES E. DOLE taught flight safety for 28 years to officers of the U.S. Air Force, Army, and Navy, as well as at the University of Southern California.

JAMES E. LEWIS is a former aeronautical engineer for the Columbus Aircraft Division of Rockwell International and a retired Ohio National Guard military pilot. He is currently an Associate Professor of Aeronautical Science at Embry Riddle Aeronautical University in Daytona Beach, Florida.

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All the best,

Crumpp