Ugh, it still has the simpleton explanation of radius of the turn (fig 3-29). While fine for casual conversations around the coffee table with non-flying friends, it does a disservice to the flying population.

Would be proper for them to list their mathematical assumptions from basic Physics101 (e.g. assuming you can stay in a horizontal plane...)

But we all know we *don't* stay in the horizontal plane when turning. Show me the dependence on the cosine of the angle, the lift coefficient for best endurance, the speed, day-type, wing-loading, aspect ratio, wing efficiency, etc. Then show me thermal profiles to backout the *best* bank angle for maximum climb rate. You know, stuff that glider pilots care about.

....62ft radius, give me a break.

The American Soaring Handbook at least gave the reader the knowledge/education to speak about our craft intelligently. This GPH writing style/method is geared towards... well... sadly, people that don't want to really understand a subject.