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92/297 Flight recorder, 'Davall Recycling Recorder', sectioned, serial No.133, invented by Dr David Warren in Australia, made by S Davall & Sons Ltd, Greenford, Middlesex, England, 1968-1978. Click to enlarge.

Sectioned ‘Red Egg’ flight recorder

Designed by Warren, David Dr in Melbourne, Victoria, Australia, 1960.

This is a flight recorder, sometimes refered to as a black box, designed to record the state of aircraft instuments. The flight recorder is an Australian innovation that has had significant impact on safety in the Australian and international aviation industry. David Warren invented the recordable device that could be made to withstand the impact of an aircraft crash. The recorded in-flight data can be analysed to gain insight into the cause of an air crash and as a tool in the prevention of rep...


Object No.


Object Statement

Flight recorder, 'Davall Recycling Recorder', sectioned, serial No.133, invented by Dr David Warren in Australia, made by S Davall & Sons Ltd, Greenford, Middlesex, England, 1968-1978

Physical Description

Metal base acting as cradle for circular bright red/ orange egg shaped metal flight recorder. Held in place by black metal/ plastic strapping. One side sectioned to reveal works. Marked on plaque: "DAVALL/ RECYCLING RECORDER/ serial no 133/ S DAVALL & SONS LTD GREENFORD/ MIDDLESEX, ENGLAND/ WEIGHT 15 lbs 8 ozs/ voltage 115 - 400 hz wattage 6/ voltage 28DC/ wattage 3/ PATENTS APPLIED FOR/"


Near the top of one side: arrows pointing in opposite directions, one labelled "BRAKE ON / TRANSIT" and the other "BRAKE OFF / RECORD"



230 mm


225 mm


230 mm


7.8 kg



In 1953, David Warren, a chemist, joined an Australian team investigating a series of Comet jet airliner crashes. He had the idea to build a machine that recorded the voices in the cockpit as well as data from flight instruments. If the machine could survive a crash, it could play back the final moments of a flight to help discover what went wrong.

Warren, assisted by Ken Fraser, Lane Sear and Wally Boswell, designed a prototype at the Australian Aeronautical Research Laboratories in Melbourne, using a Minifon wire recorder inside a thick asbestos box. Short-sighted management and Australian authorities dismissed Warren's idea as unnecessary.

Warren was invited by the UK firm Davall & Sons to help them develop and market the invention after Australians refused to take interest. Warren's only financial reward was a trip to England to accompany the prototype. His consolation is that he helped make flying a safer way to travel.

Black Box recorders (which are actually bright orange so they're easy to find after a crash) were manufactured in the UK and USA from 1960 onwards.

Every commercial plane in the world now carries a flight recorder. They record cockpit conversations and a number of flight details such as aircraft speed and altitude. Red eggs were the original prototypes made for testing and demonstrating the principal of flight crash recorders.

Red eggs were painted red to enable them to be easily found in aircraft crash wreckage, and the strong egg shape protects the internal components as well as allowing them to roll away from the crash. This particular red egg was used by Davall in the UK to demonstrate its functions to aircraft manufacturers.

The black box flight recorder was invented in Australia ? and championed into production and use ? by chemist and aeronautical expert Dr David Warren, who was born in 1925 and died in 2010. He was curious and clever (qualities needed to be an inventor) ? and persistent (the extra quality needed to be a successful innovator).

Tragedy struck David's family when he was nine years old. His father died in an aircraft crash, when a De Havilland plane travelling from Launceston to Melbourne was lost over Bass Strait. There were no survivors and no clues as to why the plane went down, leaving just an oil slick and unidentifiable pieces of wreckage floating briefly on the water's surface.

The last gift from his father was a crystal set, a basic type of radio receiver. This gift led to David's lifelong interest in electronics. He studied chemistry to PhD level and in 1949 went to England for training in rocket science. While he was there, he saw the world's first jet airliner (the first jets having been made for military use), the De Havilland Comet, at Farnborough air show. The Comet promised faster travel and a shrinking of Australian's sense of isolation from the rest of the world; David must have been impressed.

In 1953, he was working at the Australian Government's Aeronautical Research Laboratories in Melbourne when the first Comet set off for Australia. The plane crashed on take-off from Karachi airport en route. Other Comet crashes followed. David, now an expert on aviation fuel, was involved in the search for reasons for these disasters.

His deep interest in electronics came into play at this point. He had recently seen a neat device: the world's first portable sound recorder, which used steel wire as the recording medium. He imagined such devices being installed in plane cockpits, recording the words spoken by the crew, giving investigators vital clues for crash analysis.

David later worked out how to record instrument data, converted to dots and dashes like Morse code, as well as voices. However, his brilliant ideas and the research he did to back them up were not applauded by local aviation officials; they thought that all they would hear was pilots swearing. This is where that third quality, persistence, came into play ? along with interest from English officialdom. The road to regulatory approval and successful manufacture was tortuous, but by 1963 one English company was ready to go into production: S. Davall and Sons.

Visitors to our Success and Innovation exhibition can see a black box flight recorder that was made by Davall in the 1960s. It is the ?red egg' in the photo above: red so it's easy to find after a crash, and rounded to give it some chance of rolling away from burning wreckage. Despite its colour and shape, the name ?black box' has stuck.

?Black box' is a metaphor for a device whose workings we don't understand or need to understand, but whose output is interesting. We are thankful to David Warren, who did work hard to understand difficult concepts and create a clever new device. His bright idea did not make him wealthy or bring him much fame, but it has contributed immensely to the safety of flight by helping investigators to understand crashes, regulators to introduce new standards, and manufacturers to improve their planes.

Thanks also to Janice Peterson Witham, whose book ?Black box: David Warren and the creation of the cockpit voice recorder' tells his story so well.

Debbie Rudder

In 2016 the late David David Ronald de Mey Warren was posthumously awarded the forty-first Edward Warner Award at the International Civil Aviation Organisation's (ICAO's) 39th triennial Assembly, a specialised agency of the United Nations. This award is known around the world as the greatest single honour the international civil aviation community can bestow. David Warren won this award for the vision and tenacity exemplified in his conceptual work and prototype development of the ?black box? flight recorder. Dr. Warren's innovative work continues to this day to influence ICAO's) initiatives in the field of aircraft accident and incident investigation.



Davall was taken over by W Vinten Ltd, a company that made aerial reconnaissance equipment, in 1984. This sectioned flight recorder was used by Davall in England to demonstrate flight recorder functions. The flight recorder was found in a corner of the factory in 1992. The flight recorder was donated to the Museum by Vinten in 1992.


Credit Line

Gift of W Vinten Limited, 1992

Acquisition Date

30 March 1992

Cite this Object


Sectioned 'Red Egg' flight recorder 2020, Museum of Applied Arts & Sciences, accessed 6 April 2020, <>


{{cite web |url= |title=Sectioned 'Red Egg' flight recorder |author=Museum of Applied Arts & Sciences |access-date=6 April 2020 |publisher=Museum of Applied Arts & Sciences, Australia}}
This object is currently on display in Icons: From the MAAS Collection at the Powerhouse Museum.

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