Wright R-975 Whirlwind
The Wright R-975 Whirlwind was a series of nine-cylinder air-cooled radial aircraft engines built by the Wright Aeronautical division of Curtiss-Wright . 
<triplet> Wright R-975 Whirlwind <subj> aircraft engine <obj> use <triplet> radial <subj> aircraft engine <obj> use <triplet> Wright Aeronautical <subj> Curtiss-Wright <obj> followed by <triplet> Curtiss-Wright <subj> Wright Aeronautical <obj> follows