Four prototypes of the YPT-9B were produced for the Army between 1930 and 1931.  A conversion of the Model 6-A, this YPT-9B is equipped with a 210 HP Lycoming engine and is one of only two made.

Constructed of welded Chrome-Moly steel tubing in truss form.  Solid Spruce spars and Dural metal edges were all covered in fabric. As with most trainers, the practicality of use, ease of maintenance and the ability to take abuse from the beginner pilot came before beauty.

The civilian 6-L was created as a pilot trainer but hoped to catch the sportsman pilot.  A baggage compartment with an 86 lb. capacity contained two 20 lb. parachutes.  A first aid kit and fire extinguisher were standard equipment.

This YPT-9B was used at the Boeing School of Aeronautics aerobatic training. It later found a home as a seed sprayer and crop duster until procured by Yanks in 1987.