Schweizer Aircraft Corp

The Schweizer Aircraft Corporation was an American manufacturer of sailplanes, agricultural aircraft and helicopters located in Horseheads, New York. The company grew out of the Mercury Glider Club which produced the first two Schweizer gliders in the Schweizers’ barn. The company was originally called the Schweizer Metal Aircraft Company. Attorney Bob McDowell indicated to the Schweizers that they should move their manufacturing operation out of their father’s barn and relocate to the Elmira, New York area. The Schweizers received the suggestion positively as they needed more space to produce gliders, but they had no money with which to make the move.

It was incorporated in 1939 by three Schweizer brothers (Paul, William, and Ernest), who built their first glider in 1930.

McDowell convinced Elmira Industries Inc, the local business development corporation, to provide space for the Schweizers on the second floor of the Elmira Knitting Mill Building in return for stock in the company. This resulted in the Schweizer Metal Aircraft Company becoming the Schweizer Aircraft Corporation in 1939, with a sale of shares to Elmira Industries, local businessmen and soaring pilots.

Schweizer primarily produced light, piston-engined helicopters for use in utility and flight-training roles. The Schweizer 300CBi, originally designed and manufactured by Hughes aircraft as the Hughes 269 for the United States Army, is one of the most widely used training helicopters in the world. In 1986, Schweizer acquired all rights to the helicopter from McDonnell Douglas, who had purchased Hughes Helicopters in 1984. After Schweizer acquired the FAA Type Certificate, the helicopter was known for a short time as the Schweizer-Hughes 300C and then simply, the Schweizer 300C.

Schweizer is perhaps known best for its popular line of gliders (sailplanes), the earliest of which (the model SGP 1-1) was produced in 1930. Although very few of the early gliders were built, later models gained popularity, such as the SGS 2-8 and 2-12, which were adopted by the U.S. Army Air Corps for training as the TG-2 and TG-3, respectively.

The Schweizer SGS 1-23 was a world class competition and record setting glider between its first flight in 1948 and the end of its production in 1967.

In the 1950s and 60s the Schweizer Aircraft Corporation designed and manufactured the very popular SGS 1-26 and SGS 2-33 gliders. They are easy to fly, with simple construction, and are quite rugged and forgiving. A powered light aircraft, the Schweizer SA 1-30 was tested, but did not go into production.

The 2-33 was adopted by the United States Air Force Academy as the TG-4, for use in introductory airmanship training. The Academy used over a dozen such gliders until 2002 when they were replaced by more modern sailplanes. The Royal Canadian Air Cadets continue to operate a fleet of over seventy 2-33As.

Other popular Schweizer gliders include the single-seat SGS 1-26 and the two or three-seat 2-32, both of which can be found in many soaring clubs and in private ownership across the United States.

Primarily designers and makers of sailplanes, one of which (SGS 2-32) fitted with piston engine was tested by Lockheed Aircraft Corporation as Q-Star for ‘quiet reconnaissance’ in Vietnam. On Q-Star was based the Lockheed YO-3A, using Schweizer wings and tail, new fuselage and muffled engine.

Company also built for Grumman the Ag-Cat agricultural biplane, later for Gulfstream, before acquiring the rights in 1981 (Ag-Cat subsequently produced by Ag-Cat Corporation).

Schweizer produced the Grumman G-164 Ag Cat, a single-engine biplane agricultural aircraft originally developed by Grumman in the 1950s. Under the contract with Grumman the airplane was built almost continuously between 1957 and 1981. During this period of time Schweizer built 2,455 of the airplanes.

In 1981 Schweizer bought the rights to the design and continued production under the name Schweizer Ag Cat. In 1995 Schweizer sold the rights to the Ag Cat to Ag-Cat Corp. of Malden, Texas. In February 2001 the design was sold to Allied Ag-Cat Productions Inc. of Walnut Ridge, Arkansas. Allied Ag-Cat is not producing new aircraft although a related company operates a large fleet of Ag-Cats.

The basic airframe incorporates many safety innovations, including a pressurized cockpit to keep pesticides out, air conditioning and a fuselage structure that is designed to progressively collapse in the event of a collision.

The basic designof Schweizer S269C remained unchanged over the years. Between Hughes and Schweizer, nearly 3,000 copies of the Model 269/300 have been built and flown over the last 50 years. Schweizer continued to develop the Model 300 by adding a turbine and redesigning the body to create the Schweizer 330, and then further developments led to the development of the Schweizer 333.

An improved version in the series, the Sikorsky S-434, was released in 2008.

In 1972 Schweizer hired David Thurston and production of his Thurston Teal was part of the agreement to work at Schweizer. The company produced three Schweizer TSC-1A1 Teals and nine TSC-1A2 Teal IIs before production was moved to Teal Aircraft in 1976.

The development of the Schweizer SGM 2-37 two-place motor glider for the United States Air Force Academy in 1982 led to a new area of expertise for the company. In the mid-1960s Lockheed had used the Schweizer SGS 2-32 sailplane as the basis for its YO-3 quiet reconnaissance aircraft. Schweizer decided to develop the SGM 2-37 into a similar concept aircraft as the YO-3. The result was the SA 2-37A and B, known as the RG-8A in military use.

The RG-8A was later developed by the company into the twin piston-engined and twin-boom SA 2-38 Condor with the US military designation of RU-38A Twin Condor. This design was further refined into the turboprop-powered RU-38B Twin Condor. The RU-38 was still in production in 2008.

It is believed the US Drug Enforcement Administration purchased aircraft designated Shadowhawk from Schweizer. The aircraft had a poor operational history. They may be designated SA 38B.
Other projects

In partnership with Northrop Grumman (formerly Ryan Aeronautical), Schweizer is developing the MQ-8 Fire Scout helicopter UAV.

Schweizer is currently participating in development of Sikorsky’s X-2 Demonstrator, a prototype aircraft using co-axial rotor blades with a pusher propeller for extra forward thrust.

Makes fuselage assemblies for Piper Aircraft Corporation and structures for Bell Helicopters. Became license-holder for Hughes 300 helicopter in 1983, producing piston-engined three-seat Model 300C from 1984 to present day and developing new 3/4-seat Model 330 turboshaft-powered helicopter (first flown June 1988); also supports Hughes Model 269s.

In 1986 flew the SA 2-37A low-noise special-missions aircraft suited to surveillance and other roles, followed in May 1995 by a radical twin-boom SA 2-37A conversion known as SA 2-38A. Two joined the U.S. Coast Guard as RU-38A Twin Condors for covert patrol and surveillance (one by conversion, one built as new).

In December 1999, Schweizer Aircraft celebrated its 60th Anniversary, and had built more than 2,160 sailplanes. Schweizer was a major U.S. aerospace contractor and no longer manufactured gliders.

Helicopter products offered by the company as of February 2009 included the 300C, 300CBi, and 333.

Previously the oldest privately owned aircraft company in the United States, Schweizer was acquired by Sikorsky Aircraft Corporation of Stratford, Connecticut, in 2004, and became a diversified aerospace company.

In 2011 and 2012 Sikorsky Aircraft Corporation laid off all the workers and closed the plant.

Schultz FS3 Besenstiel

The F.S.3 sailplane was designed and built by Ferdinand Schulz, and also bore the nickname “broomstick”. The high-wing has a two-slatted wing with a modified Joukowski profile by Schulz. The roof beams are formed by two spars. The F.S.3 was exclusively made of fir and door hinges, the cover consisting of old army bed covers. The control was by two flaps at the wing tips.

Klaus Heyn built the original FS3, supported by Erich Kristan, 1924 technical assistant with F. Schulz. In 1924 the F.S.3 was not allowed by the Technical Commission (Teko) at the Rhönwettbewerb because of lack of construction strength.

Although of classic formula (horizontal and vertical empennage) the tail plates are fixed. The steering and roll controls are controlled by two triangles at the end of the wing, operated by two independent handles. The structure is wood (round section), in the form of “N”.

The glider was tested in secret. On May 11, 1924, Ferdinand Schulz remained in the air during the second German coastal flight competition on the Curonian Spit near Rossitten with his “Broomstick” 8 hours and 42 minutes by using the slope upwind, thus setting a world record.

Length: 4,8 m
Wing span: 12,5 m
Wing area: 18,4 m²
Aspect ratio: 9,8
Empty weight: 47,3 kg
TO weight: 123 kg
Maximum pilot weight: 80 kg
Wing loading: 7,2 kg/m²
Seats: 1

Schultz Nucleon

The Nucleon designed by Art Schultz, which first flew in 1954, has a wing bult of Styrofoam around a spar and convered with a fiberglass shell. To save weight, struts were used with cuffs at both ends. It has full span flaps, with drooping ailerons, and a horizontal tail which folds up for trailing.

The structure was I-strut braced all-wood wings, steel-tube/ fabric wings and braced tail.

Wing span: 14 m / 46 ft
Wing area: 12.17 sq.m / 131 sq.ft
Aspect ratio: 16
Airfoil: NACA 65 (2)-415
Empty Weight: 156 kg / 345 lb
Payload: 86 kg / 190 lb
Gross Weight: 242 kg / 535 lb
Wing Load: 19.88 kg/sq.m / 4.1 lb/sq.ft
L/DMax: 22 76 kph / 41 kt / 47 mph
MinSink: 1.00 m/s / 3.3 fps / 1.96 kt
Seats: 1

Schultz ABC / TG-16

The ABC, an Art Schultz development of the simpler, shorter span Midwest MU-1 designed three years earlier, won the 1937 Eaton design competition. The result was due largely to its design and ease of construction, while the much higher performing Ross-Stephens RS-1 Zanonia placed second due to complicated construction and emphasis on ground tow capability. The first all-metal Schweizer sailplane, the SGU-1-6, was third.

The structure was steel tube fuselage and tail, two-spar two-strut wood wing, all fabric coverd. The ABC was offered in plan form and a few were built prior to World War II. After the outbreak of war, one was used as the TG-16 at the USAAC glider training school in Mobile, Alabama.

Wing span: 14.78 m / 48.5 ft
Wing area: 16.26 sq.m / 175 sq.ft
Aspect ratio: 13.2
Airfoil: NACA 6212
Empty Weight: 136 kg / 300 lb
Payload: 77 kg / 170 lb
Gross Weight: 213 kg / 470 lb
Wing Load: 13.1 kg/sq.m / 2.69 lb/sq.ft
L/DMax: 18
MinSink: 0.85 m/s / 2.8 fps / 1.66 kt
Seats: 1
Number built: 4

Schukking 1908 Glider

A glider built and flown in the Netherlands by Willem Hendrik Schukking – a member of the the Dutch Royal Engineers – in 1908. It was not proceeded with, one reason being that Schukking married and had to swear that he would never fly again. The machine was a biplane on which the pilot flew downhill while in a forward prone position.

Schneider DFS 108-14 SG-38 Schulgleiter / ESG-9 / Grunau 9 / Tachikawa Ki-24

The Schneider DFS 108-14 SG-38 Schulgleiter (German for “school glider”) is a German high-wing, cable-braced, single-seat primary glider that was developed from the Stamer Lippisch Zögling, and designed by Schneider, Rehberg and Hofmann at Edmund Schneider’s factory at Grunau in 1938, hence the designation. It was produced by several builders, including Deutsche Forschungsanstalt für Segelflug (DFS).

The SG 38 was designed to be a training glider for basic flight training by the Nationalsozialistisches Fliegerkorps (NSFK). The usual launch method was by bungee cord from a sloped hill. Because training was conducted solely by solo flight the aircraft had to be very easy to fly and also easy to repair.

Schneider DFS108-14 / Schulgleiter SG-38

The high-wing design uses a kingpost and cable bracing. The primary structure of the glider is of wood, with the wings, tail surfaces and inverted “V” kingpost all finished in doped aircraft fabric covering. The pilot sits on a simple seat in the open air, without a windshield.

The basic configuration was similar to earlier gliders such as the Stamer Lippisch Zögling and the Grunau IX, but the SG 38 was an entirely new design. Improvements included enlarged tail surfaces for better stability, a separate skid mounted on shock-absorbing springs, and an updated seat for the pilot. Features were parallel rudder movement, provisions for trim weights fore and aft, and screw jack atop A- frame which facilitated assembly and disassembly. Large horizontal stabilizer and small elevator surface, with limited up-travel, made accidental stalls almost impossible.

Schneider ESG-9 / Grunau 9

First flying in 1938, the SG-38 played a critical role in pilot training for the Luftwaffe in the Second World War, as a simple, but robust, trainer for the rapid increase in the number of pilots needed by Germany. It was commonly flown by bungee launch on the slopes of the Wasserkuppe.

Landings could be made, usually without damage, with stick all the way back during final glide. After student had learned to balance glider with ailerons while facing into wind, level ground “Rutsches”–short duration sling-shots with insufficient speed to become airborne–were made. Higher launch velocities followed to permit short flight; then student would advance to hillside launches and, finally, to winch tows and longer flights.

Schneider DFS108-14 / Schulgleiter SG-38 SG-1

From 1949 to 1951 Spain’s AISA produced 50 licence-built aircraft. The SG-38 was built in Japan as the Tachikawa Ki-24.

In the UK, Elliotts of Newbury built a copy of the SG.38 called the Elliotts Primary EoN; its version first flown in 1948 and used by the RAF as the Eton TX.1.

Schneider ESG-9 / Grunau 9 IL / G 36

Overall, about 10,000 were built.

SG 38
Wingspan: 10.41 m (34 ft 2 in)
Wing area: 16 m2 (170 sq ft)
Aspect ratio: 6.76
Length: 6.28 m (20 ft 7 in)
Height: 2.43 m (8 ft 0 in)
Empty weight: 100 kg (220 lb)
Gross weight: 210 kg (463 lb)
Maximum speed: 115 km/h (71 mph, 62 kn)
Never exceed speed: 115 km/h (71 mph, 62 kn)
Maximum glide ratio: 10:1 at 52 km/h
Wing loading: 13.75 kg/m2 (2.82 lb/sq ft)
Crew: One

Schneider Grunau Baby / AB Flygplan Grunau Baby / Hirth Grunau Baby / Nord 1300 / EoN Type 8 Baby / Slingsby T 5 Baby 2 / Laminação Nacional de Metais Alcatraz / Companhia Aeronáutica Paulista Alcatraz

Schneider Grunau Baby

There was a need for a single seat glider which would be suitable both for training and high performance cross-country flying, and to meet this need Wolf Hirth and Edmund Schneider designed and built the Grunau Baby, which made its first flight in 1932; it took its name from the town of Grunau just south of Berlin, now Jeżów Sudecki in Poland, where it was built.

It was designed by Edmund Schneider with the assistance of Wolf Hirth and Hugo Kromer as a smaller version of Schneider’s ESG 31 of the previous year, incorporating an elliptical wing design based on work done by Akaflieg Darmstadt. The first 14 inner ribs were of the Gotinngen 535 shape with the outer ribs gradually changing up to the last 22nd rib having a bi-convex and symmetrical shape with a slight reduction in the angle of incidence. The tips and leading edges of the wings up to the main spar were covered with plywood. The tail unit was built of plywood. The intention was to create an aircraft suitable both for training and for cross-country soaring. It was a high-wing braced monoplane with a fuselage of hexagonal cross-section and an open cockpit. This single-seater was of simple wood and fabric construction with a high strut-braced wing, a plywood fuselage of hexagonal cross-section and an open cockpit ahead of the wing leading edge.

Production began in 1933 and in its initial form the Baby’s span was 42 ft 2.5.

An extensive redesign was undertaken in 1932 following the fatal crash of an unrelated Schneider design, which resulted in the Baby II. This version and the definitive Baby IIb that followed were adopted as standard sailplane trainers for the German Air Sports Association (later the National Socialist Flyers Corps). In 1935 the Baby 2 was produced with the wing span increased to 44 ft 6.25 in. In the Baby 2A and 2B the retangular cross-section fuselage was strengthened with double layers of diagonal plywood; there was now a windscreen to protect the pilot, skid landing gear and airbrakes, although many have been modified by the addition of canopies. About 80 Mk 1s and around 700 Mk 2A and 2B variants were built by Grunau Riesengebirge, and the Baby was built under licence in a number of other European countries, production eventually totalling several thousand. The Baby IIB-2 was an intermediate performance single-seat glider circa 1960.

Grunau Baby 2.

Among the licensees were Slingsby, who built 15 at their Kirkbymoorside works from 1935 as the T 5 Baby 2, and some others were also built by amateur constructors from BGA-supplied plans. The Slingsby-built ones had no air brakes whereas Elliott’s version, known as the Type 8 Baby Eon, had spoilers in the wing upper surfaces. The Baby Eon was an improved version of the Baby 2B, and had an enclosed cockpit canopy; instead of the German built Baby’s single main landing skid, the Elliott version had a rubber-mounted ash main skid with a single main wheel of fixed centre, plus a tail skid. It was also available with an open cockpit as well as an enclosed ‘bubble’ canopy; an elevator trimmer and a belly hook for higher winch launching were offered as optional extras.

During 1941, 30 Grunau Baby gliders were built by Laminação Nacional de Metais, later Companhia Aeronáutica Paulista in Brazil, under the name “Alcatraz”.

Production of the Baby Eon version of the Baby 2 began in 1948 and 47 were built altogether, plus several more from Elliott factory-supplied kits. An improved variant of the Baby Eon, incorporating a new tailplane and mass-balanced elevators, first flew in 1956 while another improved postwar variant was the Grunau Baby 3, which had several modifications over the earlier Mk 2, including an enclosed cockpit. Upper wing spoilers were fitted, no flaps.

Series production was undertaken under license by Nord in France. The French built Grunau 2B was renamed Nord 1300, some alterations were made, which resulted in inferior performance. By November 1947, 250 Nord 1300 were built.

The Grunau Baby was made in Sweden by AB Flygplan circa 1945. When Edmund Schneider, the Baby’s co-creator and manufacturer, moved to Australia after the war and formed his own company there at the invitation of the Gliding Federation of Australia, he produced the improved version, the Grunau Baby 4.

In Finland in 1949 Mr Pentti Alanne and Mr Vilho Swahn fitted a Grunau Baby with a French Poinsard engine in the nose, and a landing gear similar to a Piper Cub’s.

It is estimated that around 5000 Grunau Babies or derivatives were made worldwide, including Germany, Great Britain, France, Sweden, Poland, Norway, Czechoslovakia, Romania, South Africa, Australia, China, Canada, Argentina, and the U.S..

In addition to training glider pilots, the Grunau Baby was used to train Luftwaffe pilots, who, in accordance with the Treaty of Versailles, could not fly powered aircraft. Many pilots of the Baby II achieved the ‘Silver C’ soaring badge, which required the pilot to be airborne for more than five hours, gain a minimum of 1000 m after takeoff and travelling 50 km.

AB Flygplan Baby II G2

The Vintage Sailplane Association has plans.

Grunau-Baby V

The Grunau Baby V was designed by Herbert Gomolzig, and Wuppertal.

Variation:
Aachen FVA-15

Gallery

Grunau Baby
Wing span: 13.56 m / 44.5 ft
Wing area: 14.17 sq.m / 152.5 sq.ft
Length: 19.291 ft / 5.88 m
Height: 6.365 ft / 1.940 m
Empty Weight: 159 kg / 350 lb
Payload: 91 kg / 200 lb
Gross Weight: 250 kg / 550 lb
L/DMax: 17 61 kph / 33 kt / 38 mph
MinSink: 0.79 m/s / 25 kt /29 mph
Wing Load: 17.64 kg/sq.m / 3.6 lb/sq.ft
Aspect ratio: 13
Airfoil: Go 535
Seats: 1

Baby IIB
Type: Soaring plane
Wingspan: 44 ft 6.25 in / 13.57 m
Length: 19 ft 11.75 in / 6.09 m
Aspect ratio: 12.8
Wing area: 152.849 sqft / 14.2 ssq.m
Wing section: Gottingen 535
MTOW: 551.3 lb / 250 kg
Weight empty: 352.8 lb / 160 kg
Max. payload: 198.5 lb / 90 kg
Max. speed: 86 kts / 160 km/h / 93 mph
Landing speed: 27 kts / 50 km/h
Stalling speed: 21.5 kt / 40 km/h
Min sinking speed: 2.8 ft/sec / 0.85 m/sec at 34mph / 30 kt / 55 km/h
Best glide ratio: 17:1 at 37.5mph / 32.5 kt / 60 km/h
Wing load: 3.69 lb/sq.ft / 18 kg/sq.m
Glide ratio: 17
Seats: 1

AB Flygplan Grunau Baby II B2
Type: Single seat sailplane
Span: 13.6 m / 45 ft
Length: 5.9 m / 20 ft

Grunau Baby V
Wing span: 14 m
Wing area: 15 sq.m
Aspect ratio: 13.06
Airfoil: Go 535
Empty Weight: 202 kg
Gross Weight: 420 kg
Wing Load: 28 kg/sq.m
L/DMax: 19 kph
MinSink: 0.90 m/s 62 kph
Seats: 2

EoN Type 8 Baby
Wingspan: 13.55 m / 44 ft 5 in
Length: 6.27 m 20 ft 6.75 in
Wing area: 14.21 sq.m / 153 sq.ft
Aspect ratio: 13
Wing section: Gottingen 535 root, Symmetrical tip
Empty weight: 154 kg / 340 lb
AUW: 250 kg / 550 lb
Undercarriage: Main skid, main wheel, tail skid

EoN Type 8 Baby

Schneider ES-63 / Platypus ES-65

ES-65

With the advent of the fibreglass designs onto the Australian scene during the mid 1960’s the Australian manufacturer; Edmund Schneider Ltd., began to look at a replacement for the very successful ES52 Kookaburra trainer. This resulted in the development of the ES63; a 17 metre span high performance two seater of advanced concept. A lack of capital combined with a difference of opinion with the GFA Design and Development Committee resulted in the project being shelved. In 1982 Harry Schneider revived the concept incorporating some design changes and improvements to bring the project up to date. This resulted in a prototype; the ES65 Platypus, being built and first flown on 2nd August 1984 with side by side seating.

Unfortunately the venture capital to finance the glider’s production has not been forthcoming. The prototype is of wood/glass construction. The prototype’s two piece wing is of 17 metre span, with a beech spar, birch ply skin covered by GFRP (the production wing was to be of GFRP construction). Seating is side by side arrangement in a most spacious cockpit. The two piece canopy with the aft section being rear hinged has ample visibility through large areas of perspex to the point of being able to see the rudder during flight. Rudder pedals and seats are adjustable allowing good accommodation for pilots of any size for long flights, with or without parachutes. The tail is mounted low on the fin with both rudder and elevator having horn balances smoothly blended into the design. There are three wheels on the centre line of the fuselage and, on entering the cockpit, the nose drops comfortably onto the forward wheel. This has made a reasonable balance about the main wheel possible, making the tail quite light to lift during on-ground manhandling.

The aircraft is fairly sensitive in pitch, picking up speed rapidly on lowering the nose. Thermalling requires a speed of around 50 knots, while exhibiting good stability in circling allowing for relaxed handling while thermalling. Rate of roll from 45 degrees bank to 45 degrees is 4.5 secs. The Platypus spins well, with a smooth slowish turn, not very steep from which recovery is precise and rapid with standard spin recovery procedures. The performance seems to be good for instructing cross-country flights over long distances. The side by side seating causes some initial confusion with horizon perception in turns, but the advantages are for the instructor in assessing the student, and the ability to communicate and demonstrate.

Wing span: 17.7 m
Wing area: 15.8 sq.m
Empty Weight: 400kg
Gross Weight: 590 kg
Airfoil: Wortmann FX61
L/DMax: 1:38
Seats: 2

Schneider Boomerang ES-60 Arrow / Super Arrow

The ES 60B Super Arrow was developed from the Standard Class single-seater, the ES 60 Series 2 Boomerang, and the ES 59 Arrow; the Boomerang was designed in 1964 for competition flying, and the first of two prototypes made its first flight on 28 November 1964, followed by the second on 24 December that year. These were followed by six ES 60 Series 1s built in 1966, and 28 ES 60 Series 2s completed in 1967 and 1968, plus a few more built since then, this differing from the Series 1 in having the height of the plywood-covered fin reduced by 3in, and a lengthened sideways-opening Perspex cockpit canopy; later production Series 2s had the nose lengthened by 2.5 in, a larger monowheel and an adjustable seat back for the pilot. The Boomerang soon made its mark in contest flying, and for a time held all the Australian national speed records over 100km, 200km and 300km triangular closed circuits, at speeds of 54mph, 55mph and 59mph respectively.

The Boomerang was succeeded by the ES 60B Super Arrow, also designed for competition flying, which first flew in prototype form on 22 September 1969 and which was awarded a C of A on 31 October that year. It was the same as the ES 60 Series 2 Boomerang but had the conventional tail unit of the ES 59 Arrow with an unswept, fixed tailplane mounted at the base of, and forward of the fin instead of the Boomerang’s swept-back ‘all flying’ tailplane, the halves of which were mounted separately on the fin about one-third of the way up, being secured by automatic spring-loaded bayonet couplings. In both cases the tailplanes were cantilever wooden structures with plywood and fabric covering, that of the Boomerang having a trim tab that also acted as an anti-balance tab, the fin being ply-covered and the wooden rudder fabric covered. Apart from their tailplanes, the two types are of the same wooden construction, with a cantilever highset one-piece wing with a laminated beech spar at the 50% chord line, a moulded plastic leading edge and birch ply covering back to 60% chord; wing tip ‘bumpers’ are fitted. There are no flaps, but metal scissor-type air brakes with epoxy-bonded wooden flanges are fitted at 55% chord; the wooden ailerons are plywood-covered. The ply-covered semimonocoque fuselage has glassfibre fairings, and the non-retractable monowheel has an expanding shoe brake; unlike the ES 59 Arrow, there is no nose skid, but there is a spring steel tailskid. The pilot sits under a sideways-opening jettisonable Perspex canopy, and has adjustable rudder pedals and seat back; the customer specifies what instruments are fitted, and oxygen and radio can also be carried.

ES 60B Super Arrow

Wing span: 15m / 49.2ft
Wing area: 12.82sq.m / 138sq.ft
Aspect ratio: 17.5
Airfoil: Wortmann
Empty Weight: 241kg / 531lb
Payload: 106kg / 234lb
Gross Weight: 347kg / 765lb
L/DMax: 31 90 kph / 49 kt / 56 mph
MinSink: 0.72 m/s / 2.35 fps / 1.39 kt
Wing Load: 26.07kg/sq.m / 5.5lb/sq.ft
Seats: 1

ES 60B Super Arrow
Span: 49 ft .5 in / 15.0 m
Length: 23 ft 2.5 in / 7.04 m
Height: 5 ft 0 in / 1.52 m
Wing area: 138 sq.ft / 12.87 sq.m
Aspect ratio: 17.5
Wing section: Wortmann FX-61-184/60-126
Empty weight: 488 lb / 221.5 kg
Max weight: 765 lb / 347 kg
Water ballast: None
Max wing loading: 26.96 kg/sq.m / 5.52 lb/sq ft
Max speed: 140 mph / 121 kt / 225 km/h (in smooth air)
Max aero-tow speed: 103 mph / 89 kt / 165 km/h
Stalling speed: 32.5 kt / 60 km/h
Min sinking speed: 2.3 ft/sec / 0.7 m/sec at 47 mph / 40 kt / 75 km/h
Best glide ratio: 30.7:1 at 53 mph / 49 kt / 90 km/h

ES 60B