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Although we often consider maximizing airflow over the exterior of an aircraft, we sometimes neglect internal airflow design that can cause significant drag.

Riveting soft materials.

RANS S-7S builder Tom Simko details how his desire to fly year-round in snow country was satisfied (and then some) by installing Datum wheel skis.

Everything old is new again. Paul Lamar looks at the turbo-compound engine, developed in the post-WW-II era. Thrown over for jet engines, it may yet hold promise today as we search for more energy efficient ways to get the most out of increasingly expensive fuel.