Republic XP-69 - Aeroplane - avia.wikisort.org

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The Republic XP-69 was an American fighter aircraft proposed by Republic Aviation in 1941 in response to a requirement by the United States Army Air Corps for a high-speed fighter. Manufacturers were encouraged to consider unorthodox designs; although the design was ordered as a prototype it was canceled because of delays with the engine that was to power it.

XP-69

XP-69 model during wind tunnel testing
Role	Fighter
Manufacturer	Republic Aviation
Designer	Alexander Kartveli
Status	Canceled
Primary user	United States Army Air Forces (intended)
Number built	1 (incomplete)

Development

The United States Army Air Corps began the R40-C fighter competition in February 1940. The competition encouraged manufacturers to propose unorthodox high-speed fighter aircraft that met the requirements of Type Specification XC-622.[1] The specification called for a single-engined high-performance fighter aircraft, with a maximum speed between 425 and 525 mph (684 and 845 km/h), armed with both machine guns and cannons, and be capable of landing on a 3,000 ft (910 m) long grass runway.[2]

Republic was one of six companies selected for the competition, and one of the aircraft proposed to the USAAC by Republic was the AP-12 Rocket. As proposed, the AP-12 was to be powered by a 2,500 hp Wright R-2160-3 Tornado 42-cylinder liquid-cooled radial engine mounted in the mid-section of the aircraft's streamlined, cigar-shaped fuselage, behind the cockpit, which drove a pair of three-bladed contra-rotating propellers.[1][3] It was to be armed with four nose-mounted machine guns firing through the propeller arc, and a single 20 mm cannon firing through the propeller hub.[1] The AP-12 placed 13th out of 26 contestants, forcing Republic to go back to the drawing board to improve its proposal.[1]

In July 1941, Republic submitted an improved design, the AP-18. The AP-18 had little in common with the AP-12. It retained the original aircraft's R-2160 engine, which was now mounted in the nose of a completely new small-cross section airframe.[4] The large radiator was to be mounted under the fuselage. The pressurized cockpit was to feature a bubble canopy, and an armament of four .50 in machine guns and two 37 mm cannons mounted in a laminar flow wing was planned.[4]

In December 1941, the United States Army Air Forces (successor to the USAAC) ordered two prototypes of the AP-18 under the designation XP-69.[1] A mockup was built and was inspected by the USAAF in June 1942.[4][3] Construction of the first prototype began in November of that year.[3] However, due to development troubles and delays with the R-2160 engine, the XP-69 project was canceled in favor of a parallel development, the Republic XP-72, on May 24, 1943. By that time engineering on the project was 75% complete and the prototype was still in the early stages of construction, with the total program cost being $810,000.[3]

Specifications (XP-69 as planned)

Data from [4][3]

General characteristics

Crew: 1
Length: 51 ft 6 in (15.70 m)
Wingspan: 51 ft 8 in (15.75 m)
Height: 17 ft (5.2 m)
Wing area: 505 sq ft (46.9 m²)
Airfoil: NACA 66-114 at root, NACA 66-213 at tip[5]
Empty weight: 15,595 lb (7,074 kg)
Gross weight: 18,655 lb (8,462 kg)
Max takeoff weight: 26,164 lb (11,868 kg)
Powerplant: 1 × Wright R-2160-3 Tornado 42-cylinder turbo-supercharged liquid-cooled radial engine, 2,500 hp (1,900 kW)
Propellers: 6-bladed Hamilton Standard contra-rotating propellers, 13.7 ft (4.2 m) diameter

Performance

Maximum speed: 450 mph (720 km/h, 390 kn)
Range: 1,800 mi (2,900 km, 1,600 nmi)
Service ceiling: 48,900 ft (14,900 m)
Rate of climb: 2,750 ft/min (14.0 m/s)

Armament

Guns:
- 4 × .50 in (12.7 mm) machine guns (1,280 rounds)
- 2 × 37 mm cannons (80 rounds)

References

Pearce, William (2016-05-07). "Republic XP-69 Fighter". Old Machine Press. Retrieved 2020-06-04.
Chong, Anthony (2016-06-15). Flying Wings & Radical Things: Northrop's Secret Aerospace Projects & Concepts 1939-1994. Specialty Press. p. 13. ISBN 978-1-58007-229-8.
Norton, Bill (2008). U.S. Experimental & Prototype Aircraft Projects: Fighters 1939-1945. Specialty Press. p. 155. ISBN 978-1-580-07109-3.
Baugher, Joe (August 7, 2011). "Republic XP-69". www.joebaugher.com. Retrieved 2020-06-04.
"Airfoils". aerofiles.net. Retrieved 2020-07-11.

Republic and Seversky aircraft

Seversky aircraft

Republic aircraft

Fighters	P-43 P-44 P-47 XP-69 XP-72 F-84 F-84F XF-84H XF-91 XF-103 F-105 AP-100
Reconnaissance	XF-12 SD-3 SD-4
Missiles	JB-2 KGW KUW
Civil aircraft	RC-1 RC-2 RC-3

Names

Project numbers¹

AP-1
AP-2
AP-3
AP-4
AP-5
AP-6
AP-7
AP-8
AP-9
AP-10
AP-12
AP-16
AP-18
AP-19
AP-21
AP-22
AP-23
- M/X
AP-24
AP-31
AP-38
AP-41
AP-42
AP-43
AP-44
AP-46
AP-47
NP-48
NP-49
NP-50
NP-52
AP-54
AP-55
AP-57
AP-60
AP-63
AP-71
AP-75
AP-76
85
AP-90
AP-95
AP-96
AP-100
AP-106

USAAS/USAAC/USAAF/USAF fighter designations 1924–1962, and Tri-Service post-1962 systems

1924 sequences
(1924–1962)

Pursuit (1924–1948)	P-1 P-2 P-3 P-4 P-5 P-6 P-7 P-8 P-9 P-10 P-11 P-12 P-13 P-14 P-15 P-16 P-17 P-18 P-19 P-20 P-21 P-22 P-23 P-24 P-25 P-26 P-27 P-28 P-29 P-30 P-31 P-32 P-33 P-34 P-35 P-36 P-37 P-38 P-39 E P-40 P-41 P-42 P-43 P-44 P-45 P-46 P-47 P-48 P-49 P-50 P-51 P-52 P-53 P-54 P-55 P-56 P-57 P-58 P-59³ XP-59 P-59 P-60 P-61 P-62 P-63 P-64 P-65 P-66 P-67 P-68 P-69 P-70 P-71 P-72 P-73² P-74¹ P-75 P-76 P-77 P-78 P-79 P-80 P-81 P-82 P-83 P-84 P-85 P-86 P-87 P-88 P-89 P-90 P-91 P-92
Fighter (1948–1962)	F-38 F-39 F-40 F-47 F-51 F-59 F-61 RF-61C F-63 F-80 F-81 F-82 F-83 F-84 F/J H F-85 F-86 C D/G/K/L F-87 F-88 F-89 F-90 F-91 F-92 F-93 F-94 F-95 F-96 F-97 F-98 F-99 F-100 B F-101 F-102 B F-103 F-104 S XF-104 NF-104A F-105 F-106 F-107 F-108 F-109² F-110 F-111 B C K AFTI EF-111A
Pursuit, Biplace	PB-1 PB-2 PB-3
Fighter, Multiplace	FM-1 FM-2
Non-sequential	F-24 P-322 P-400

Tri-service sequence
(1962–present)

Main sequence	F-1 C/D E/F F-2 F-3 F-4 K/M F-5 G F-6 F-7 F-8 F-9 F/G/H/J F-10 F-11 F-12 C² F-13¹ F-14 F-15 E J STOL/MTD F-16 XL VISTA F-17 F-18 E/F G F-19¹ F-20 F-21 F-22 YF-22 FB-22 F-23
Non-sequential	F-35 I X-35 F-117

Covert designations

YF-110
- B/D
- C
YF-113 (I)
- A
YF-113 (II)
- B/D
YF-113 (III)
- C
YF-114
- C/D
YF-117
- A
- D
YF-118

Related designations

FV-12

¹ Not assigned • ² Unofficial • ³ Assigned to multiple types
See also: "F-19" • 1919-1924 sequence

На других языках

- [en] Republic XP-69

[fr] Republic XP-69

Le Republic XP-69 est un prototype de chasseur de haute altitude envisagé en 1940 par Alexander Kartveli comme successeur de son chasseur-bombardier P-47 Thunderbolt qui venait d’entrer en service dans l’United States Army Air Forces (USAAF).

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