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 .
Head entity: wright aeronautical Q1971987 20 21
Tail entity: curtiss-wright Q1138291 24 25 26
Relation (head \u2192 tail): P155
Inverse relation (tail \u2192 head): P156