Photo courtesy of Raymond L. Puffer, Ph.D.,
Historian, Air Force Flight Test Center, History Office.
Photo copyright History Office, Air Force Flight Test Center, Edwards AFB; used by permission.
The first of the two XF-84H Thundershrieks, so nicknamed because of the sonic booms emitted by the propeller on this turboprop test bed. The triangular dorsal fin is said to be a vortex generator to counter the prop wash. Also, there are unconfirmed statements that this aircraft had an afterburner installed, but that raises the question: "An afterburner on a turboprop?"