The latest flub, in the October issue, while describing how to do a loop in a glider: ". . . I will manage the energy by making a constant-G pull-up that converts the airspeed into altitude most efficiently." I've never flown a glider, so maybe that is a valid way to do a loop in one, but it certainly won't make the tallest loop. The increasing angle of attack needed to maintain constant g as speed drops will cause much more induced drag than progressively reducing the g load. I'm sufficiently annoyed about this egregious error that I'm tempted to write a letter to the editor, but I'm deterred by my lack of experience in gliders. So I decided to post my rant here instead.