 Many similarities exist between the designs that caused controversy.Also, enough differences in technologies were made between the aircraft that the 3-AT can be seen as a unique design, as well.The 3-AT trimotor had a blunt nose, with its central radial engine mounted close to the nose's bottom, and two wing-mounted outboard, uncowled radial engines, projecting forward of the wings' leading edges at the front of each of a pair of nacelles.