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In Case You Missed It

Hatz Classic: A Homebuilt Waco

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First-time builder Ron Sieck’s Hatz Classic biplane comes charmingly close to perfection.

How the Pros Do It: Ripley Air

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Ripley Air—small shop with clever ideas.

A Quarter Century of Excellence

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Zenith Aircraft celebrates its 25th anniversary.

Wind Tunnel

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When the airflow separates from a surface, the result can be unsteady forces or turbulent wake shedding, neither of which is desirable.