Robin ATL

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ATL
Robin.atl.l.g-gfrd.vtail.arp.jpg
Role Light aircraft
Manufacturer Avions Robin
First flight 17 June 1983
Produced 1985—1991
Number built 132

The Robin ATL (Avion Très Léger) is a French two-seat light aircraft designed by Avions Robin in the 1980s to meet a need for an economical two-seat aircraft to equip flying clubs. It is a single-engined monoplane with a fixed undercarriage, and is, unusually, fitted with a V-tail.

Development and design[edit]

In the early 1980s, Avions Pierre Robin started design of an ultra-lightweight two-seat light aircraft intended to meet the requirements of French flying clubs for a low-cost light trainer, as existing American training aircraft were becoming increasingly expensive, which was not helped by an unfavourable exchange rate, which resulted in a competition to supply a new light trainer, which could be mass-produced for supply to subsidised French flying clubs. Robin won the competition in 1983 with their ATL design, a single-engined low-winged monoplane with a fixed undercarriage and a V-tail. The ATL's fuselage was of Glass-reinforced plastic construction, with a wooden wing.[1]

The first prototype flew on 17 June 1983, powered by a single 35 kW (47 hp) JPX PAL 1300, a new design of two stroke, three-cylinder radial engine.[2] However, testing showed that the new engine was prone to vibration, and in order to speed development and certification, the prototype was re-engined with a converted Volkswagen car engine,[3] which formed the basis for production. As the four-cylinder car engine was heavier than the original engine, the aircraft's wings were swept forward to maintain the aircraft's centre of gravity in an acceptable position.[2]

Operational history[edit]

First orders, for 30 ATLs were placed by the French National Aviation Federation in November 1983, with initial deliveries starting (under a limited airworthiness approval) in April 1985. Full French certification followed on 15 January 1986.[2] The ATL was prone to engine problems, however, which forced the recall of early production aircraft for modification, and limited the attractiveness of the aircraft, particularly for export.[4]

One solution to this problem was re-engining with a more reliable engine, and Robin developed a version for the German market powered by a 52.5 kW (70 hp) Limbach. While the Limbach was also a modified VW car engine, crucially, it had dual ignition instead of the single ignition on the JPX-modified engines normally used, this being certified in 1989.[4][5] This came too late, however, and production ended in 1991 after the completion of 132 aircraft, of which 10 were powered by the Limbach engine.[4]

Variants[edit]

ATL Club
Initial production version, named Bijou in the UK.
ATL Club Model 88
Late production version, with smaller propellor giving greater ground clearance and more fuel.
ATL Club Model 89
Limbach powered version.

Specifications (ATL Club)[edit]

Data from Jane's All the World's Aircraft 1988-89 [2]

General characteristics

  • Crew: Two
  • Length: 6.72 m (22 ft 0½ in)
  • Wingspan: 10.25 m (33 ft 7½ in)
  • Height: 2.00 m (6 ft 6¾ in)
  • Wing area: 12.15 m² (130.8 ft²)
  • Airfoil: NACA 43015 modified
  • Empty weight: 360 kg (794 lb)
  • Max. takeoff weight: 580 kg (1,278 lb)
  • Powerplant: 1 × JPX 4T 60A four-cylinder air-cooled horizontally opposed, 48 kW (65 hp)

Performance

See also[edit]

Aircraft of comparable role, configuration and era

References[edit]

  1. ^ Blech 1985, p.26.
  2. ^ a b c d Taylor 1988, p.83.
  3. ^ Flight International 26 November 1983, p.1418.
  4. ^ a b c Donald 1997, p.775.
  5. ^ Flight International 1 July 1989, p.20