The Evinrude Heli-Bout designed by Brooks Stevens to showcase the 1961 Evinrude 75hp outboard motor.

I've never seen this bio sheet on Brooks before, so... here ya go

http://www.woodyboater.com/blog/2015/01/26/2015-minneapolis-winter-boat-show-bslol-chapter-celebrates-the-designs-of-brooks-stevens/

Mario did a great feature post on it

https://mariothemultipla.wordpress.com/2017/02/22/ww-3a-the-heli-bout/