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 THEFLANKER

SU-27

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 The Sukhoi Su-27 is a one-seat Mach-2 class jet fighter originally

manufactured by the Soviet Union, and designed by the Sukhoi Design

Bureau. It was intended as a direct competitor United States fourth

generation fighters, with long 3,530 km range, heavy armament,

sophisticated avionics and high agility. The Su-27 most often flies air

superiority missions, but is able to perform almost all combat operations.

BACKGROUND:

In 1969 the Soviet Union felt the serious technological advantage of F-15

over existing Soviet fighters. F-15 is a better-balanced fighter with both

good agility and sophisticated systems.

In response, the Soviet union issued a requirement for

a Perspektivnyy   Frontovoy   Istrebite l (PFI, means an ADVANCED

FRONTLINE FIGHTER). Specifications were extremely ambitious:

a) Long range

b) Good short-field performance

c) Excellent agility

d) Mach 2+ speed

e) Heavy armament. The aerodynamic design for the new aircraft was

largely carried out by TsAGI in collaboration with

the Sukhoi design bureau.

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When the specification proved too challenging and costly for a single

aircraft in the number needed, the PFI specification was split into two:

the LPFI (Lyogkyi PFI, Lightweight PFI) and the TPFI (Tyazholyi PFI, Heavy

PFI). The LPFI program resulted in the MiG-29, a relatively short-range

tactical fighter, while the TPFI produced the Su-27 and its various

derivatives.

DESIGN :

It is a very large aircraft, and to minimize its weight its structure has ahigh percentage of titanium (about 30%). No composite materials were

used. The swept wing blends into the fuselage at the leading edge

extensions and is essentially a delta, although the tips are cropped for

wingtip missile rails or ECM pods

 The Su-27’s Lyulka AL-31F turbofan  engines are widely spaced, both for

safety reasons and to ensure uninterrupted airflow through the intakes.

 The space between the engines also provides additional lift, reducing

wing loading. Movable guide vanes in the intakes allow Mach 2+ speeds,

and help to maintain engine airflow at high alpha. A mesh screen over

each intake prevents debris from being drawn into the engines during

take-off.

 The Su-27 had the Soviet Union’s first operational fly-by-wire control

system. Combined with relatively low wing loading and powerful basic

flight controls, it makes for an exceptionally agile aircraft, controllable

even at very low speeds and high angles of attack. In air shows the

aircraft has demonstrated its maneuverability with a Cobra (Pugachev’s

Cobra) or dynamic deceleration - briefly sustained level flight at a 120°

angle of attack. Thrust vectoring has also been tested (and is

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incorporated on later Su-30MKI and Su-37 models), allowing the fighter to

perform hard turns with almost no radius, incorporate vertical

somersaults into level motion and limited nose-up hovering.

 The Su-27 has a high-contrast tunable HUD and a Helmet mounted

display capability, which, paired with the R-73 missile and the plane's

superb agility make it one of the world's best dogfighter aircraft.

General characteristics

Crew: 1 or 2

Length: 21.9 m (72 ft)

Wingspan: 14.7 m (48 ft 3 in)

Leading edge sweep: 42°

Height: 5.92 m (19 ft 6 in)

Wing area: 62 m² (667 ft²)

Empty weight: 16,380 kg (36,100 lb)

Loaded weight: 23,430 kg (51,650 lb)

Max takeoff weight: 30,450 kg (67,100 lb)

Power plant: 2× Saturn/Lyulka AL-31F turbofans, 122.8 kN (27,600

lbf) each

Performance

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Maximum speed: Mach 2.35 (2,500 km/h, 1,550 mph) at altitude

Range: 3,530 km (2,070 mi) at altitude; (1,340 km / 800 mi at sea

level)

Service ceiling: 18,500 m (62,523 ft)

Rate of climb: 300 m/s (64,000 ft/min)

Wing loading: 371 kg/m² (76 lb/ft²)

Thrust/weight: 1.09

THE SUPER

FLANKER

SU-35

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 The Sukhoi Su-35 is a heavy class, long-range & multi role fighter. Due

to the similar features and components it contains, the Sukhoi Su-35 is

considered to be a close cousin of the Sukhoi Su-30MKI, a specialized

version of the Su-30 for India. It has been further developed into the Su-

35BM.  The Su-35 is an advanced Su-27 derivative and was initially

designated Su-27M.

DESIGN & DEVELOPMENT:

 The Su-27M development began in the early 1980s. A Su-27M prototype

(T-10S-70) first flew in 1988. Changes from the Su-27 include canards,

upgraded engines, new radar, and a digital fly by wire flight control

system. Other changes made were glass cockpit, aerial refueling probe,

twin-wheel nose gear, more powerful radar, two additional under wing

pylons, additional fuel capacity, and larger tail fins with horizontal carbon

fiber tips.

 The first prototype was publicly displayed in 1992 at the Farnborough Air

show.

General characteristics :

Crew: 1

Length: 21.9 m (72.9 ft)

Wingspan: 15.3 m (50.2 ft)

Height: 5.90 m (19.4 ft)

Wing area: 62.0 m² (667 ft²)

Empty weight: 18,400 kg (40,500 lb)

Loaded weight: 25,300 kg (56,660 lb)

Max takeoff weight: 34,500 kg (76,060 lb)

Powerplant: 2× Saturn 117S with TVC nozzle turbofan

Dry thrust: 8,800 kg (86.3 kN, 19,400 lbf) each

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Thrust with afterburner: 14,500 kgf (142 kN, 31,900 lbf) each

Performance:

Maximum speed: Mach 2.25(2,410 km/h, 1,500 mph) at altitude

Range: 3,600 km (1,940 nmi) ; (1,580 km, 850 nmi near ground level)

Ferry range: 4,500 km (2,430 nmi) with external fuel tanks

Service ceiling: 18,000 m (59,100 ft)

Rate of climb: >280 m/s (>55,100 ft/min)

Wing loading: 408 kg/m² (84.9 lb/ft²)

Thrust/weight: 1.14

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Sukhoi Su-35 (Flanker-

E / Super Flanker)Sukhoi Su-27 (Flanker)

MODEL Sukhoi Su-35 (Flanker-E / Super Flanker) Sukhoi Su-27 (Flanker)ORIGIN Russia Russia

CONTRACTOR 

Sukhoi - Russia Sukhoi - USSR

TYPE Multi-role Fighter Multirole Fighter

SERVICESTART

2009 1984

CREW 1 1

LENGTH 71.85 feet (21.90 meters) 71.98 feet (21.94 meters)

SPAN 50.20 feet (15.30 meters) 48.23 feet (14.70 meters)

HEIGHT 19.36 feet (5.90 meters) 19.46 feet (5.93 meters)

EMPTY WT 38,581 pounds (17,500 kilograms) 36,112 pounds (16,380 kilograms)

MTOW 167,684 pounds (76,060 kilograms) 72,753 pounds (33,000 kilograms)

POWERPLANT

2 x Saturn 117S TVC-nozzled turbofanengines with afterburner delivering 31,900lbf each.

2 x Saturn / Lyulka AL-31F turbofan engineswith afterburn generating 27,557lbs of thrust.

SPEED 1,678 mph (2700 km/h) (1,458 kts) 1,553 mph (2500 km/h) (1,350 kts)

RANGE 2,796 miles (4,500 km) 2,287 miles (3,680 km)

CEILING 59,055 feet (18,000 m) (11.2 miles) 59,091 ft (18,011 m) (11.2 miles)

ARMAMENT 1 x 30mm Gun

Mission-specific weaponry can include any of the following:

1 x 30mm cannon

Mission-specific ordnance can include:

10 x AA-8 Aphid air-to-air missiles

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R-27 air-to-air missilesR-40 air-to-air missilesR-60 air-to-air missilesR-73 air-to-air missilesR-77 air-to-air missilesKh-25ML air-to-surface missilesKh-25MP air-to-surface missilesKh-29 air-to-surface missiles

Kh-31 air-to-surface missilesKh-59 air-to-surface missiles

S-25 IR rocketsGBU-500 laser-guided bombsGBU-1000 laser-guided bombsGBU-500T TV-guided bombsGBU-1000T TV-guided bombs

10 x R-27R air-to-air missiles10 x R-27Ts IR Guided air-to-air missiles10 x R-27ERs semi-active radar air-to-airmissiles10 x R-27ETs IR-guided air-to-air missiles10 x R-73s air-to-air missiles10 x R-60s air-to-air missiles6 x AA-10C Alamo air-to-air missiles

 Relative Size Comparison:

Sukhoi Su-35 (Flanker-E / SuperFlanker)

Sukhoi Su-27 (Flanker)

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