A perfect glide path can be managed with elevator; the speed with throttle. This assumes, however that the aircraft speed never drops below Vx. If it does, then back stick will not recover lost altitude. Throttle won't necessarily result in more speed.
The rules we give students need to apply in all cases. The time they need the rules most is just when things aren't going right. Throttle for altitude and pitch for speed always works. That's the method with which we will continue.
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On another note, NAFI has launched a price war -- a big shot across our nose. If we want SAFE to be anything other than a social alternative to NAFI, we need to start developing some training materials, contacts, and dialogs that deliver value to the flight instruction community.