Assertion: windmill's patent sail | /r/HasProperty | 15 feet tip-width
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text: It was built in 1830 to plans by millwright Edward Ingledew (who also built, among others, Wragby tower mill in 1831, Waltham Windmill in 1837, and the former Pickworth tower mill) for her first owner and founder Michael Hare of red brick, the outer walls being tarred (provided with a black bitumen paint in order to keep moisture out), as a five-sailed windmill (very similar to Alford Windmill) with Sutton's single patent sails (15 feet tip-width and 12 feet heel-width) providing longitudinal shutters on both sides of the backs (36 feet in length).