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Republic XP-47H Thunderbolt.

The "What is it?" aircraft in our last issue was the Republic XP-47H Thunderbolt.

The Thunderbolt was the most numerous American fighter ever built, but the H model was not the familiar "Jug" that fought in every theater of World War II. A colossal Chrysler XI-2220-II inverted-V 16-cylinder liquid-cooled, in-line engine--rated at about 2,300 horsepower--powered this version of the Thunderbolt.

Two aircraft were covered by this contract (serials 42-23297 and 42-23298). The Chrysler powerplant changed the appearance of the Thunderbolt considerably, but Republic's famous fighter was being used only as a test bed for the engine. The Army Air Forces never seriously contemplated manufacturing a version of the Thunderbolt with this arrangement.

According to according to
1. As stated or indicated by; on the authority of: according to historians.

2. In keeping with: according to instructions.

 Roger Freeman, in Thunderbolt: A Documentary History of the Republic P-47, the two XP-47H airplanes began on the Evansville, Indiana
For other places named Evansville see Evansville (disambiguation).

Evansville (IPA: [ˈɛ.vənzˌvɪl]) is the third-largest city in the state of Indiana.
, production line as P-47D models. Freeman wrote that creation of the H model entailed redesigning the aircraft forward of the firewall, with new duct work to the General Electric CH-5 turbosupercharger and modifications to associated equipment, including intercooler outlet doors. The XP-47H used a thirteen-foot, four-bladed Curtiss Electric propeller.

Construction of the XP-47H took longer than planned. The first ship made its initial flight at the Evansville factory on July 27, 1945. By then, the United States United States, officially United States of America, republic (2005 est. pop. 295,734,000), 3,539,227 sq mi (9,166,598 sq km), North America. The United States is the world's third largest country in population and the fourth largest country in area.  was on the verge On the Verge (or The Geography of Yearning) is a play written by Eric Overmyer. It makes extensive use of esoteric language and pop culture references from the late nineteenth century to 1955.  of canceling dozens of aircraft contracts. Fighting ended less than three weeks after that maiden flight Noun 1. maiden flight - the first flight of its kind; "the Stealth bomber made its maiden flight in 1989"
flying, flight - an instance of traveling by air; "flying was still an exciting adventure for him"

Chrysler continued developmental work on the XI-2220 and another, even larger, engine well into the postwar years. Very little has been published about how the XP-47H contributed to this effort but, in the end, no production engine ever reached Air Force units.

Our follow-up photo, obtained from Republic in the 1950s, shows the first XP-47H running up on the ramp at Evansville.

Twenty-one readers sent in "History Mystery" postcards. All identified the XP-47H correctly.

Our History Mystery. winner is Roland Plante of Bettendorf, Iowa. Roland receives a copy of the book Air Force One, by the author of this column. Copies of the book are available from Bob at
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Title Annotation:History Mystery
Author:Dorr, Robert F.
Publication:Air Power History
Date:Sep 22, 2003
Previous Article:Book received.
Next Article:This issue's mystery plane.

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