(Pitts) Pitts Special @·AIRCRAFTUBE

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Pitts Special

The Pitts Special (company designations S1 and S2) is a series of light aerobatic biplanes designed by Curtis Pitts. It has accumulated many competition wins since its first flight in 1944. The Pitts biplanes dominated world aerobatic competition in the 1960s and 1970s and, even today, remain a potent competition aircraft in the lower categories.

Design and development

Curtis Pitts began the design of a single-seat aerobatic biplane in 1943–1944. The design has been refined continuously since the prototype's first flight in September 1944, however, the current Pitts S2 still remains quite close to the original in concept and in design.

Several of the aircraft that Curtis Pitts built had a picture of a skunk on them and were called "Stinkers". After she bought it, aerobatic performer Betty Skelton called the second aircraft that Curtis built, "Lil' Stinker". The prototype S-2, which was the first two-seat Pitts, was "Big Stinker", the prototype Model 11 (later called S1-11B) was "Super Stinker", and the prototype Model 12 was the "Macho Stinker".

In 1962 Curtis Pitts set up Pitts Enterprises to sell plans of the S-1C to homebuilders.

Operational history

All single-seat (S-1) and two-seat (S-2) Pitts Specials are variations on the basic design from 1944.

The aircraft was popularized by Betty Skelton, Caro Bayley and other air show performers, which led to the offering of plans in 1962.

Pitts produced limited numbers of aircraft during the 1940s and 1950s. It is widely accepted that the Pitts Special is the standard by which all other aerobatic aircraft are judged. After a number of homebuilt aircraft were produced from rough hand-drawn plans produced by Pitts, more professionally drawn plans went on sale in 1962. While many homebuilt aircraft were built in the 1960s, earning the S1 a reputation as an excellent aerobatic aircraft, Pitts worked on the design of a two-seat aerobatic trainer version, the S-2, which first flew in 1967 and gained its type certificate in 1971. Factory-built aircraft produced by the Aerotek company at Afton, Wyoming were joined in production by the single-seat S-1S in 1973.

The design's popularity grew significantly following Bob Herendeen's participation on the USA Aerobatic Team in a Pitts Special in the World Aerobatic Competition in Moscow, Russia in 1966.

In 1972, the US National Aerobatic Team won the World Championships flying only Pitts biplanes.

In 1977 Curtis Pitts sold his interests in the Pitts S1 & S2 to Doyle Child. Child later sold the rights in 1981 to Frank Christenson, who continued production at the Afton plant under the guise of Christen Industries. The rights for homebuilt versions of the Pitts were sold in 1994 to Steen Aero Lab, with the Afton factory and production rights being transferred to Aviat.

Curtis Pitts died in 2005 at age 89. At the time of his death, he was working with Steen on the prototype of the new Pitts Model 14, a brand new, two-seat biplane designed for unlimited aerobatics powered by the 400 horsepower Vedeneyev M14P radial engine. The rights to the Pitts name is currently owned by Aviat which also owns the similar model to the Pitts in the Christen Eagle.

The current world record for the number of consecutive flat spins is 81, held by Spencer Suderman in 2014 in a Pitts S2-B from 23,000ft altitude.

Current versions

Certified versions of the compact Pitts are now produced by Aviat in Afton, Wyoming. It is available as an S1 single-seater with an up to 200 hp (150 kW) flat-4 Lycoming engine and a 17 ft 4 in (5.28 m) wingspan, or as an S2 two-seater variant featuring a 260 hp (194 kW) flat-6 Lycoming and a 20 ft (6.1 m) wingspan. Pitts Specials have been equipped with engines of up to 450 hp (338 kW).

The Pitts held sway over the aerobatic world championships until the rise of the monoplane, though it remains very competitive in all levels of competition and remains a favorite of air show performers worldwide. The first monoplane to topple the Pitts from the top of unlimited aerobatic competition was the Russian- built and designed Yak-50.

On March 13, 2014 air show performer Spencer Suderman broke the inverted flat spin world record in a Pitts S-2B by completing 81 full rotations from an altitude of 23,000' over the California desert in El Centro, CA. The previous record was held by a Giles 202 monoplane and stood since 1999.

Today, the single-seat Pitts S1-S plans are available from Aviat Aircraft. The S1-C and derivative S1-SS plans and kits are supplied by Steen Aero Lab in Palm Bay, Florida. The S1 continues to provide extremely high performance at relatively low cost. Many hundreds of homebuilders have successfully completed and flown the Pitts since plans became available in 1960.

Variants

  • S-1 : Basic single-seat Pitts aerobatic biplane with a flat M6 aerofoil section and lower wing ailerons only, fitted with a variety of engines. Two were built, the first named Special and the second Li'l Stinker.
  • S-1C : Amateur-built S-1 single-seat aircraft, flat bottom wing with ailerons on lower wing only, designed for 100–180 hp (75–134 kW) engines. First flown in 1960, the S-1 is currently available as a plans-built aircraft from Steen Aero Lab.
  • S-1D : Amateur-built S-1C with ailerons on all four wings, generally similar to S-1S.
  • S-1E : Amateur-built S-1C using factory-produced kits. Uses symmetrical airfoil.
  • S-1F : Outside derivative homebuilt, with the Falcon wing. Square tips, 25% more aileron span. In the UK, this model is fitted with a 200 hp (149 kW) Monty Barrett engine, and a lightweight Hoffmann VP propeller.
  • S-1S : Aerotek-built certified S-1C for competition aerobatics, round airfoil section, four ailerons and powered by a 180 hp (134 kW) Lycoming AEIO-360-B4A; 61 built. This model is also available from Aviat Aircraft as a plans-built aircraft.
  • S1-SS : Similar to the certified S1-S "Roundwing". 180–200+ hp (134–149 kW), single-seat, homebuilt, symmetrical wing, four symmetrical "Super-Stinker" style ailerons, 300 degree/s roll rate, fixed-pitch propeller. This model is available in plans and components form from Steen Aero Lab.
  • S-1T : Aerotek-built S-1C with a 200 hp (149 kW) Lycoming AEIO-360-A1E and minor changes; 64 built. Four-aileron, single-seat, factory-built, symmetrical wing, symmetrical ailerons, constant speed two- or three-blade Hartzell propeller. The top wing was moved forward compared to the S-1S for weight and balance. This model was in production in 2008 from Aviat Aircraft as an "on-demand" manufacture product.
  • S1-11B : Known as Model 11 "Super Stinker", 300+ hp (220 kW) Lycoming, four-aileron, single-seat, experimental-plans or factory-built and factory component parts, symmetrical airfoil, three-blade constant speed prop, rolls better than 300 degree/s, climbs better than 3,000 ft/min (15.3 m/s).
  • S-2 : Scaled up S-1 with tandem two-seat fuselage and powered by a 200 hp (149 kW) Lycoming AEIO-360-B4A piston engine.
  • S-2A : Aerotek-built S-2A with a 200 hp (149 kW) Lycoming AEIO-360-A1A or -A1E piston engine, constant speed propeller, later builds has a longer landing gear and a 2-inch-wider (51 mm) front cockpit; 259 built.
  • S-2B : Aerotek-built S-2A with a 260 hp (194 kW) Lycoming AEIO-540-D4A5 engine, and upper wing auxiliary fuel tank, the landing gear and upper wings were moved forward six inches; 196 built. The aircraft is out of production but is supported by Aviat Aircraft.
  • S-2C : Four aileron, two-seat, factory-built, symmetric airfoil, 260 hp (194 kW) Lycoming driving constant speed three-blade propeller, current production model. This was an evolution of the S-2B model, with improved ailerons and rudder, flat bottom fuselage, lower profile bungee gear, better inverted handling and certified for +6 -5g. It is in production in 2008 by Aviat Aircraft.
  • S-2E : Amateur-built S-2A from factory-produced kits.
  • S-2S : Aerotek-built S-2B with a single cockpit and a twin tank fuel system. The fuselage is shortened by 14 inches (35 cm) forward of the cockpit to allow the installation of the heavier 260 hp (194 kW) Lycoming AEIO-540-D4A5. The wingspan is 20 ft, 0 inches (6.10 m); 17 built. This model is currently out of production, but supported by Aviat Aircraft.
  • S-2SE : Amateur-built S-2S from factory-produced kits.

Modifications

Samson : The "Big Pitts", it had a 450 hp (336 kW) Pratt & Whitney R-985, originally designed for Jess Bristow and was used as an air show airplane.

Military operators

  • Chile
  • Jordan : Royal Jordanian Falcons aerobatic team (4 S-2As)
  • Venezuela

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Source : Article Pitts special of Wikipedia ( authors )

Specifications (S-2B)

  • Crew: Two.
  • Length: 18 ft 9 in (5.71 m).
  • Height: 6 ft 7⅓ in (2.02 m).
  • Wingspan: 20 ft (6.10 m).
  • Wing area: 125 ft² (11.6 m²).
  • Wing loading: 13.0 lb/ft² (63.6 kg/m²).
  • Empty weight: 1,150 lb (521 kg).
  • Max. takeoff weight: 1,625 lb (737 kg).
  • Never exceed speed: 182 knots (210 mph, 338 km/h).
  • Cruise speed: 152 knots (175 mph, 282 km/h) (max cruise).
  • Stall speed: 52 knots (60 mph, 97 km/h).
  • Range: 277 NM (319 mi, 513 km).
  • Service ceiling: 21,000 ft (6,400 m).
  • Rate of climb: 2,700 ft/min (13.7 m/s).
  • Powerplant: One Textron Lycoming AEIO-540-D4A5 flat-six air cooled piston engine
  • Power: 260 hp (194 kW).
  • Power/mass: 0.16 hp/lb (0.26 kW/kg).

— — — = = — — —

This text is available under the Creative Commons Attribution-ShareAlike License
Source : Article Pitts special of Wikipedia ( authors )
Pitts Special : Your comments on this subject
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