On Feb 19, 10:36 am, Tim Taylor wrote:
I am working with a fourth printing (1988) and the equation presented
for Optimum Average Cruise Speed does not make sense. It is equation
VI in the book, but it gives a very slow speed to fly compared to the
graphical approach of just finding the tangent to the line.

That equation gives what might be called the average "travel" speed of
a leg (Reichmann calls it a "cruise" speed), which includes the time
spent thermalling - it is not a "speed to fly". Jack