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Republic XF-84H

Restoration staff move the Republic XF-84H into the new fourth building at the National Museum of the U.S. Air Force on Oct. 7, 2015. (U.S. Air Force photo by Ken LaRock)

Restoration staff move the Republic XF-84H into the new fourth building at the National Museum of the U.S. Air Force on Oct. 7, 2015. (U.S. Air Force photo by Ken LaRock)

Restoration staff move the Republic XF-84H into the new fourth building at the National Museum of the U.S. Air Force on Oct. 7, 2015. (U.S. Air Force photo by Ken LaRock)

Restoration staff move the Republic XF-84H into the new fourth building at the National Museum of the U.S. Air Force on Oct. 7, 2015. (U.S. Air Force photo by Ken LaRock)

Dayton, Ohio -- Republic XF-84H in the Research & Development Gallery at the National Museum of the U.S. Air Force. (U.S. Air Force photo by Ken LaRock)

Dayton, Ohio -- Republic XF-84H in the Research & Development Gallery at the National Museum of the U.S. Air Force. (U.S. Air Force photo by Ken LaRock)

Republic XF-84H in the Research & Development Gallery at the National Museum of the U.S. Air Force on December 28, 2015. (U.S. Air Force photo)

Republic XF-84H in the Research & Development Gallery at the National Museum of the U.S. Air Force on December 28, 2015. (U.S. Air Force photo)

Republic XF-84H in the Research & Development Gallery at the National Museum of the U.S. Air Force on December 28, 2015. (U.S. Air Force photo)

Republic XF-84H in the Research & Development Gallery at the National Museum of the U.S. Air Force on December 28, 2015. (U.S. Air Force photo)

DAYTON, Ohio -- Republic XF-84H at the National Museum of the United States Air Force. (U.S. Air Force photo)

DAYTON, Ohio -- Republic XF-84H at the National Museum of the United States Air Force. (U.S. Air Force photo)

DAYTON, Ohio -- Republic XF-84H at the National Museum of the United States Air Force. (U.S. Air Force photo)

DAYTON, Ohio -- Republic XF-84H at the National Museum of the United States Air Force. (U.S. Air Force photo)

DAYTON, Ohio -- Republic XF-84H at the National Museum of the United States Air Force. (U.S. Air Force photo)

DAYTON, Ohio -- Republic XF-84H at the National Museum of the United States Air Force. (U.S. Air Force photo)

DAYTON, Ohio -- Republic XF-84H at the National Museum of the United States Air Force. (U.S. Air Force photo)

DAYTON, Ohio -- Republic XF-84H at the National Museum of the United States Air Force. (U.S. Air Force photo)

DAYTON, Ohio -- Republic XF-84H cockpit view in the Research & Development Gallery at the National Museum of the United States Air Force. (U.S. Air Force photo by Ken LaRock)
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DAYTON, Ohio -- Republic XF-84H cockpit view in the Research & Development Gallery at the National Museum of the United States Air Force. (U.S. Air Force photo by Ken LaRock)

DAYTON, Ohio -- Republic XF-84H cockpit view in the Research & Development Gallery at the National Museum of the United States Air Force. (U.S. Air Force photo by Ken LaRock)
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DAYTON, Ohio -- Republic XF-84H cockpit view in the Research & Development Gallery at the National Museum of the United States Air Force. (U.S. Air Force photo by Ken LaRock)

Republic XF-84H (S/N 51-17060), turboprop modification of RF-84F airframe. (U.S. Air Force photo)
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Republic XF-84H (S/N 51-17060), turboprop modification of RF-84F airframe. (U.S. Air Force photo)

The turboprop-driven XF-84H -- a joint Air Force/Navy project -- was designed to combine the speed of jet aircraft with the long range, low fuel consumption, and low landing speed of propeller-driven aircraft. The XF-84H’s modified F-84F airframe included a T-tail and a triangular fin behind the cockpit to reduce the effect of torque from the propellers.

Between July 1955 and October 1956, two XF-84Hs made 12 test flights -- 11 of these flights ended with emergency landings. Although the XF-84H was one of the fastest single-engine, propeller-driven aircraft ever built, it never approached supersonic speed. Due to poor performance and high maintenance requirements, the XF-84H never became operational.

The aircraft on display was the first of the two prototypes produced by Republic, and it flew 8 of the 12 test flights. The museum obtained the aircraft from Kern County, Calif., in 1999.

TECHNICAL NOTES:
Engine:
Allison XF-40-A-1 turboprop of 5,850 shaft hp
Maximum speed: 520 mph
Range: Beyond 2,000 miles
Service ceiling: Above 40,000 feet
Weight: 17,892 lbs.

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