Republic XF-84H Thunderscreech | |
|---|---|
| Χώρα | Ηπα |
| Ρόλο | Πειραματικός μαχητής |
| Πρώτη πτήση | 22η Ιουλίου 1955 αριθ. |
| Χτισμένο | 2 |
Teh Δημοκρατία XF-84H Το "Thunderscreech" ήταν ένα πειραματικό αεροσκάφος turboprop που προέρχεται από το F-84F Thunderstreak. Τροφοδοτούμενο από έναν κινητήρα τουρμπίνας που ζευγάρωσε με μια υπερηχητική προπέλα, το XF-84H είχε τη δυνατότητα να θέσει το ανεπίσημο ρεκόρ ταχύτητας αέρα για αεροσκάφη με έλικα, αλλά δεν μπόρεσε να ξεπεράσει τις αεροδυναμικές ανεπάρκειες οδοντοφυΐας, με αποτέλεσμα την ακύρωση του προγράμματος
| Δημοκρατία XF-84H Κεραυνοί περπατήστε γύρω | |
|---|---|
| Φωτογράφους | Βλαντιμίρ Γιακούμποφ |
| Εντοπισμού | Το Εθνικό Μουσείο της USAF |
| Φωτογραφίες | 93 |
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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) |
|---|---|
| Ρόλο | Experimental Supersonic Turboprop Fighter |
| National Origin | Ηνωμένες Πολιτείες |
| Κατασκευαστής | Republic Aviation Company |
| First Flight | 22η Ιουλίου 1955 αριθ. |
| Πλήρωμα | 1 (Pilot) |
| Μήκος | 15.68 m (51 ft 5 in) |
| Εκπέτασμα | 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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