Secret Projects of Aviation: May 2010

Monday, May 31, 2010

General Electric YJ93

The General Electric YJ93 was a turbojet engine design for the XB-70 and XF-108 project. The engine was a single shaft axial flown turbojet with a variable stator compressor and a fully-variable convergent/divergent exhaust nozzle. The maximum sea-level thrust was 28,800 lbf. he YJ93 started life as the General Electric X275, an enlarged version of the J-79 tturbojet. This evolved to the X279 when Match 3 cruise became a requirement, and ultimately became the YJ93.

The engine used a special high-temperature JP-6 fuel. The six YJ93 engines in the XB-70 Valkyrie were capable of producing a thrust to weight ratio of 5, allowing for a speed of 2,000 mph (approximately Mach 3) at an altitude of 70,000 feet.

After the cancellation of XF-108 program, the XB-70 was turned into research project and one of the engine was put into museum exhibit.

Specification

Thrust dry: 19,000 lbf
Thrust wet: 28,800 lbf

TSFC dry: 0.700 lb/(lb.h)

TSFC wet: 1.800 lb/(lbf.h)
Core airflow: 275 lb/s

References:http://en.wikipedia.org/wiki/General_Electric_YJ93

Monday, May 24, 2010

Antonov Istrebitel

In 1944, Antonov was impressed by Heinkel He 162 jet fighter from Germany. So he tried to made his own design of a superior fighter with a single RD-10 turbojet. The armarments was to be 2x NK-23 cannons in nose. The cockpit seemed to be like P-39 Aircobra because it have an openable door. Later, Soviet requires of a jet fighter, so the project were given the number An-2 or SKh. But later, the new jet fighter with better configuration,the Yakolev Yak 10 was flown and tested with the same engine and weapons but more performance so the project of Antonov were no more than the wind tunnel model and cancelled.

Istrebitel windtunnel model

Performance

Powerplant: 1x RD-10 axial flown turbojet
Armarment: 2x NK-23 30mm cannon
Span:10,8m
Length:10,6m
Max Speed: about 900km/h
Crew:1 pilot

Douglas XB-31

The Douglas XB-31 was a was the design submitted by Douglas aviation company to US army air corp as a requirement of a long range heavy bombers. Around 1938, United States Army General Henry H. 'Hap' Arnold, the head of the Army Air Force, was growing alarmed at the possibility of war in Europe and in the Pacific. Hoping to be prepared for the long-term requirements of the Air Force ,Arnold created a special committee chaired by Brigadier General W. G. Kilner;,one of its members was Charles Lindbergh. After a tour of Luftwaffe bases, Lindbergh became convinced that Nazi Germany was far ahead of other European nations. Despite the promising design, it never progressed past the design stage, the reason is because the Boeing B-29 was already chosen to be main heavy bomber for Pacific theatre.
Specifications

Crew: 8 (2 pilots, 4 gunners, 1 radioman, 1 radar technician)
Length: 35,7m
Wingspan:63.1 m
Height:12,99m
Wing area:310m²
Empty weight:49,530 kg
Loaded weight:60,870 kg
Take off weight:89,800 kg
Powerplant: 4x Pratt & Whittney Wasp Mayor radials
Max speed:357mph
Range:3000 miles

References: http://en.wikipedia.org/wiki/Douglas_XB-31

Myasischev M-50 Bounder

In 1955,the Myasischev OKB(bureau) has headed toward on a research to built a supersonic bomber. The archives of the design were the dash attacks,fast bombing, nuclear bomber.The project was begun in 1955 and 2 protypes were ordered from Soviet airforce.Many designs were made until they have a new designs
. The design name's M-50 for first prototype. 2 prototypes were built but only one of them, the M-50 were flown because the project was cancelled later. Even the project was cancelled, the M-50 still have a decision to made it final flight in Tushino show. Another prototype for M-50 project, the M-52 also built as a nuclear bomber but after the project cancelled the aircraft complete but it was never have flight test and scrapped . There are also many other projects about the M-52 with other configuration but they were never built.Later it was received considerable attention from westerns observers and was given the NATO name's Bounder and presented at Tunisho show for now.
Description
Designer : OKB V.M.Myasishchev
NATO code name; Bounder
Role:Strategical supersonic bomber
Crew:2 pilots
Specification
1.M-50A
General characteristics

Crew: Two
Length: 57.48 m (188 ft 6 in)
Wingspan: 35.10 m (115 ft 2 in)
Height: 8.25 m (27 ft 1 in)
Wing area: 290.6 m² (3,128 ft²)
Empty weight: 85,000 kg (187,000 lb)
Loaded weight: 175,000 kg (386,000 lb)
Max takeoff weight: 200,000 kg (440,000 lb)
Powerplant: 2× Dobrynin VD-7M afterburning turbojets, 156.9 kN (35,270 lb_f) each, and 2× VD-7B turbojets, 92.12 kN (20,710 lb_f) each