The TA-3 featured two
diesel radial engines on tall struts above the wings. Diesel engines were relatively new and were touted as being safer because they used a less volatile fuel than gasoline. The engines were provided on loan from the Packard Motor Car Company. The salvaged all-metal wing featured internal bracing based on the
Ford Trimotor design that Towle had worked on previously. The tail used two rudders placed in the slipstream of the engines. ==Operational history==