Made in Brazil, by Tarsus Marques. If I read the translated articles right, he has won the Bike Week best of show 5 times previously.
I posted about it months ago, http://justacarguy.blogspot.com/2018/03/and-now-for-something-bit-different-but.html but couldn't learn anything. You can read all about it finally at https://www.motorede.com.br/tmc-dumont-motor-aviao/ or
tip of the hat to http://www.dwrenched.com/2018/04/dwrenched.html