Republic XF-84H サンダースクリーチ - 写真&動画

Republic XF-84H Thunderscreech
国	米国
役割	実験戦闘機
初飛行	1955年7月22日
構築	2

ザ 共和国 XF-84H 「サンダースクリーチ」はF-84Fサンダーストリークに由来する実験的なターボプロップ機でした。超音速プロペラに合致したタービンエンジンを搭載したXF-84Hは、プロペラ駆動機の非公式な気速度記録を樹立する可能性を秘めていましたが、歯が生える空力不全を克服することができず、プログラムのキャンセルをもたらしました

ソース：共和国 XF-84H サンダースクレエンウィキペディア

共和国 XF-84H サンダースクリーチウォークアラウンド
カメラマン	ウラジーミル・ヤクボフ
ローカライズ	アメリカ空軍国立博物館
写真	93

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待って、検索共和国XF-84Hサンダースクリーチ.

General Characteristics and Role

The Republic XF-84H Thunderscreech was an experimental high-speed propeller-driven aircraft developed for the U.S. Air Force in the mid-1950s. Its primary role was to test the concept of a propeller-driven aircraft capable of supersonic speed (exceeding Mach 1). It was a radical modification of the F-84F Thunderstreak fuselage, replacing the turbojet engine with a powerful turboprop engine driving a supersonic propeller. The aircraft is infamous for being one of the loudest ever built, earning it the nickname “Thunderscreech” and causing physical discomfort to ground crews due to the tips of its massive propeller blades consistently exceeding the speed of sound. Only two prototypes were ever built.

Property	Typical Value (XF-84H)
役割	Experimental Supersonic Turboprop Fighter
National Origin	米国
メーカー	Republic Aviation Company
First Flight	1955年7月22日
乗組員	1 (Pilot)
長さ	15.68 m (51 ft 5 in)
翼	10.21 m (33 ft 6 in)
Maximum Takeoff Weight	13,600 kg (30,000 lb)

Powerplant and Sonic Features

Engine: 1 x Allison XT40-A-1 turboprop engine.
Power Output: Approx. 5,850 hp (4,360 kW).
Propeller: A massive 12-foot (3.66 m) diameter Aeroproducts constant-speed propeller with three large blades.
Sonic Boom: The tips of the propeller blades consistently moved at speeds up to Mach 1.18 even at rest, generating a continuous, high-intensity sonic shockwave that was audible 25 miles (40 km) away.
Maximum Achieved Speed: The aircraft never officially exceeded Mach 1, though it was designed for speeds up to Mach 1.05. The fastest measured speed was around 837 km/h (520 mph).
Design Challenge: The high torque from the powerful turboprop required a vertical stabilizer extension beneath the tail to counter the rotational forces, similar to what was later used on the C-130 turboprop.

Program Outcome and Legacy

Pilot Reports: Pilots reported severe engine vibration, handling difficulties, and poor landing characteristics. The massive torque required complex rudder and aileron trimming.
Flight History: The two prototypes completed only a total of 12 flights, none of which lasted longer than 20 minutes, due to recurring engine and mechanical issues.
Cancellation: The program was abruptly canceled in 1956, largely due to its technical impracticality, the intense noise and vibration issues, and the successful development of conventional jet fighters.
Legacy: The XF-84H holds the distinction of being the fastest propeller-driven aircraft in history (though not truly supersonic), serving as a unique dead-end in aviation history.
Preservation: The sole surviving aircraft, one of the two prototypes (serial number 51-17060), is currently displayed at the National Museum of the United States Air Force in Dayton, Ohio.

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