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In page Westland Whirlwind (fighter):

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An aspect of the type often criticised was the high landing speed imposed by the wing design.[citation needed] Because of the low production level, based on the number of Peregrines available, no redesign of the wing was contemplated, although Westland did test the effectiveness of leading-edge slats to reduce speeds. When the slats were activated with such force that they were ripped off the wings, the slats were wired shut.[4]