When the weather changes unexpectedly or some time other problems might be appears that time pilot should have to rapidly reducing altitude in such situations, each of which has benefits and issues to be aware of. There are three possibilities.
(a) Big ears induces decent rates of 2m/s. It is the most controllable of the techniques and the easiest for beginners to learn. By pulling on the outer A lines the wing tips of the glider can folded in. This method drastically deteriorates the glide angle with only a small decrease in forward speed.
(b) A B line stall induces descent rates of 5m/s. If increases loading on parts of the wing the pilot's weight is mostly on the B lines, instead of spread across all the lines. There is not a rick of the pilot becoming disoriented as a result of using this technique. In a B line stall the second set of risers from the leading edge, front the B lines are pulled down independently of the other risers with the specific lines used to initiate the condition being responsible for its name.
(c) A spiral dive offers the fastest rate of descent at 10-15m/sec. It places greater loads on the wing than other techniques do and requires the highest level of skill from the pilot to execute safely.
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