The Brown-Young BY-1, also called the Columbia Sesquiplane and the Model 2, was a prototype sesquiplane from Columbia Aircraft Co. Richard E. Young was the inventor of Spiralloy, a directional glass fibre composite material used in high-strength applications.

Together with Willis C. Brown he designed and built the BY-1, a four-seat equivalent to the two-seat Luscombe Phantom parasol monoplane.

[2] The wings were fabric covered, while the fuselage was of all-metal construction and supported the non-retractable tailwheel.

[3] A single Jacobs radial engine in the nose drove a two-bladed propeller.

The BY-1 was scrapped at White Rock Airport in Dallas, Texas for materials during the Second World War.