The new fiberglass wing tips extend just 6 inches beyond the ends of the spars, versus 18 inches for the earlier tube-and-fabric tips. The two foot reduction in wing span yields higher cruise and top speeds, with resulting gains in fuel economy. Importantly, because of the shape of the new tips the Challenger still retains its low stall speed. Also, the tips attach in such a way as to stiffen the outer portion of the wing. This gives the ailerons a better bite, for more rapid roll initiation and, together with the shorter span, a faster roll rate.

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