Edgley EA-7 Optica

The Edgley EA-7 Optica is a British light aircraft designed for low-speed observation work, and intended as a low-cost alternative to helicopters. The Optica has a loiter speed of 130 km/h (70 kn; 81 mph) and a stall speed of 108 km/h (58 kn; 67 mph).

Design and development

The Optica project began in 1974 with a company, Edgley Aircraft Limited, formed by John Edgley who, with a small team, designed and built the original prototype. In 1982, institutional investors bought into the project and set up a production line at Old Sarum Airfield in Wiltshire. Over the next three years, the company was built up to full manufacturing capability, the aircraft received UK certification, and the first customer aircraft was delivered. Despite this success, the additional investment necessary for the final phase of full production was not forthcoming, the business went into receivership, and John Edgley was forced out. With new owners, aircraft on the production line were completed, and the Optica entered service.

The aircraft has an unusual configuration with a fully glazed forward cabin, reminiscent of an Alouette helicopter, that provides 270° panoramic vision and almost vertical downward vision for the pilot and two passengers. The aircraft has twin booms with twin rudders and a high-mounted tailplane. It is powered by a Lycoming flat-six normally-aspirated engine situated behind the cabin and driving a fixed pitch ducted fan. Due to the ducted fan, the aircraft is exceptionally quiet. The aircraft has a fixed tricycle undercarriage with the nosewheel offset to the left. The wings are unswept and untapered. The aircraft is of fairly standard all-metal construction, with a stressed skin of aluminium.

The aircraft's distinctive appearance has led to it being known as the "bug-eye" in some popular reports.''Flight International'' 12 May 1979, p. 1591.

Operational history

The Optica, powered by a 160 hp (119 kW) Lycoming IO-320 engine, made its maiden flight on 14 December 1979''Flight International'' 12 May 1979, p. 1594. when it was flown by Squadron Leader Angus McVitie, the chief pilot of the Cranfield College of Aeronautics.

The Optica, upgraded to the more powerful Lycoming IO-540,''Flight International'' 21 April 1984, p. 1111. entered production in 1983. Edgley Aircraft Limited obtained its initial Civil Aviation Authority certification on 8 February 1985.Taylor 1988, p.294.

A total of 22 Opticas were built, while construction of a 23rd began but was not completed. Ten aircraft were destroyed in an arson attack at the factory.

The Optica went through several changes of ownership, until FLS Aerospace (Lovaux Ltd) took over the rights, together with the design and manufacturing rights to the Sprint: a two-seat ab-initio trainer that had been designed by Sydney Holloway in Cornwall UK at about the same time as the Optica. Lovaux had intended to develop both aircraft, with the Sprint intended as the military trainer for the UK forces. However, the Sprint was not adopted for this role, and Lovaux cancelled both projects.

The Optica and the Sprint together then passed through other owners until, in 2007, they were offered to John Edgley who formed a new company, AeroElvira Limited, with three former employees of Edgley Aircraft (Chris Burleigh, Fin Colson and Dave Lee) who at that time were working on both projects for the then-owners. The new company successfully put G-BOPO back into service as a UK demonstrator, with a first return-to-service flight on 3 June 2008. In August 2016 Interflight Global (IFG) announced plans to start a valuation of the dormant Optica programme with a view to relaunching production. In December 2016, IFG completed its valuation and in June 2017, delivered an LOI to AeroElvira to continue with due diligence, appraisal and further steps to re launch the EA-7 Optica aircraft programme in the 2018–19 timeframe. IFG planned to develop, market and support the Optica, outsourcing the fabrication and final assembly to an FAA/EASA Part 23 certified OEM. At the end of 2018, IFG modified its initial program re-launch efforts whilst, again, identifying and selecting a suitable OEM strategic partner to update the Optica TC and to bring the aircraft into production. As of the end of 2019, IFG continues to seek for a strategic OEM partner to re-launch the program aligned with optionally piloted and powered by electric or hybrid electric powerplants. As of 2022, IFG, in a post COVID 19 Pandemic re assessment of intent, remains active in the search for strategic partners to assist in the re launch the aircraft program.

Accidents and incidents

On 15 May 1985, Optica G-KATY crashed, killing its Hampshire Constabulary pilot and his photographer passenger. The UK Department of Transport Air Accidents Investigation Branch found, inter alia, that: "There was no indication that either structural or mechanical failure had occurred or of flying control malfunction or jamming." and that "The final loss of control was caused by either the aircraft stalling in a turn at a high angle of bank, or the nose dropping."

On 11 March 1990, G-BMPL, while in flight, sustained damage to the ducted fan and hub assembly and minor airframe damage. The pilot performed a successful forced approach landing: there were no injuries and no further damage to the aircraft. A subsequent investigation discovered cracks resulting from metal fatigue on the fan hub. The manufacturer issued a service bulletin calling for a hub inspection before further flight, and the UK Civil Aviation Authority issued a Mandatory Airworthiness Notice (No. 004-05-90). The Optica fan has now been replaced by one designed and manufactured by Hoffmann Propeller.

Specifications

See also

References

Notes

Bibliography

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External links

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Edgley Optica in the air
''Flight International'' 1980

''Flight International'' 1985
AeroElviraOptica
*{{YouTube , id=iVr3u6E66EM , title=Edgley EA-7 Optica (air show flight demonstration and taxiing)

1980s British special-purpose aircraft
Edgley aircraft
Ducted fan-powered aircraft
Mid-wing aircraft
Aircraft first flown in 1979
Single-engined pusher aircraft