Based on a Gif found here (http://www.douglas-self.com/MUSEUM/POWER/rotaryengines/Watt%20engine%201782.gif), named as "James Watt's three-vane rotary of 1782".
Modeled with Solidworks 2016.
Rendered with Simlab Composer 8 Mechanical Edition.
Video at https://youtu.be/rvQ-gXbsfHA