Mechta,
I was trained to speed up for the approach in gliders because, if you suffered a wind gradient at low altitude, you had no other weapon. In a powered aircraft you do have another weapon, the engine. The trick is to recognise you might need to use it before it is too late. As I said, in the Tiger I never felt confident enough to do it solo, bearing in mind that the Tiger does not have flaps. I once remember my instructors were having a laugh, so I'm told, as I flew solo across the airfield in what turned out to be a very slow fly by instead of a precautionary landing. I am more confident now with a lot more hours and an aircraft with a better view even with the nose high and good flaps.