The "Aircraft Disposal Company", was founded in Kingsway, London, in 1920. In 1927 there was an alliance with the "Cirrus Aero Engines" and both companies were building the "Cirrus" and "Airdisco" engines (A more powerful Renault version with aluminum cylinder heads).

“ADC Cirrus II”

-Later the ADC business ceased and until 1934 the "Cirrus" engines were build by Hermes Engineering Co. In that year  Blackburn Aircraft took over and they were renamed "Blackburn Cirrus".

-ADC began building the "Cirrus" engines with four upright cylinders. After that the "Cirrus II" with 75/80 hp at 2000 rpm, while the "Cirrus III" gave 85 to 95 hp.

“ADC Cirrus III”

-There were built several known Cirrus variants (Especially the ones built in the USA by American Cirrus) like the "Upright Mark II" or the "Hi-Drive Mark III".

-Less common were the "Hermes I" engines with 105 hp. The best ADC examples were the "Airdisco" engines. (name derrived from AIR DISposal CO.). They have been installed in the Avro 504k and 548A.

“ADC Airdisco”

-In 1924 the 90 hp Airdisco engines flew in the DH-51. It was an 8-cylinder V engine (actually they were Cirrus cylinders) with 2:1 reduction gear for the propeller and it had two carburetors.

-ADC was storing surplus of the army for selling, like the 210 hp Wolseley "Viper", the Siddely "Puma" with 240 hp, the R-R "Eagle VIII" and the 300 hp engines from Hispano Suiza.

“ADC Nimbus”

-The largest ADC engine was the "Nimbus" that reached the 300/330 hp very similar to Armstrong Siddeley's Puma.

-It had 6 upright, inline, liquid-cooled cylinders. They were installed in the DH-50 and DH-37A.

“ADC Airsix”

-The ADC "Airsix" was an air-cooled variant of the "Nimbus" also with 6 upright cylinders and somewhat lighter. It did not reach the production line.

-From appendix 6: It is the Aircraft Disposal Co. (ADC). The material was properly reconditioned and in perfect order.

-One of the engines that they offered was not mentioned in the main text. It was the BR.2 or Bentley Rotary 2.

“ADC -BR.2”

"The Puma, improved it would be Nimbus"

-The development of the acquired Puma engines would lead to the Nimbus after its improvement in the Croydon Waddon factory.

-The Viper engines from Wolseley (210 hp) also passed through the hands of ADC.

“ADC-HS Viper”

-Through the chapters of Wolseley and Hispano Suiza, we see that the Viper engines were built under licence from Hispano Suiza.

-The Airdisco (AIRcraft DISposal CO) was specifically the Renault that was modified in the UK by Ing. Halford with a later singular carreer at DeHavilland for example.

“El Airdisco-Renault”

These four engines were exhibited at stand no 9 at the Paris Air Show in 1924.

The Cirrus engine that gave 60/65 hp at 1800/2000 rpm was also offered by ADC.

"ADC Cirrus engine"

And now two views of the Nimbus, or Puma from Siddeley (BHP) modified and improved by ADC.

“ADC-Nimbus”

From Appendix 10: Air Disposal Co Advertisement-Brochure with Surplus material from WWI.

"Ad Detail"