Mamba and variations on a theme... a jet, a turbofan and a gas generator....all wip.
The British and Australian governments made an agreement in 1945 that meant the UK would develop guided missile and Australia would develop the test facilities. This resulted in the creation of the Woomera Test Range and the development of the target drone by General Aircraft Factory ... the first proof of concept vehicle being the manned Pika and the drone proper was known as the Jindivick. The Pika and initial versions of the Jindivick were powered by a short life engine known as the A-S Adder and later versions that followed the first batch were Viper-engined; the last production batch was in 1997 still with the Viper.
The Adder was used on the Mk1 Jindivick. The prototype Adder first ran in Nov 1948, and was flight tested in a Lancaster flying test bed before powering the Pika into the air in 1950 and the Jindivick Mk1 in Aug 1952. The Adder incorporated some changes to its layout such as air cooling of the centre bearing eliminating the need for scavenge lines used on the Mamba. The second cutaway (first 'Aeroplane'; second 'Flight') shows the bearing layout in more detail. As the simplification worked it was soon incorporated into the Mamba engines.
The cost of neutrality was, for Switzerland, technological isolation. The end of WW2 left the federation rich but woefully ill-equipped to defend its political status in the new world order that was rapidly taking shape. It embarked on two aircraft programmes, under the leadership of Jürg Branger Technical Director of F+W Emmen, Swiss Federal Aircraft Factory, designed to move their expertise forward, with the aid of several world class scientists that were leading edge.
One, the Aigullion N-20 had four engines derived from the Mamba. These were buried in the wing, Comet-style and were configured as plenum chamber burning turbofans with air bleed for flap blowing, etc. Not much has been published but we know the engines were developed by Sulzer Brothers and several versions were planned. The SM-01 engine instruction to proceed was issued in 1947 as the engine would be the critical item, in terms of development timescale.
In an article translated in the late 60s, 'Aviation History in the Swiss Transport Museum it refers to the N-20:
"Potentially the most interesting types at Lucerne are the N-20 Aiguillon STOL fighter and the Arbalète research aircraft, both evolved after the war by the Federal Aircraft Factory at Emmen, near Lucerne.
Of modified delta-wing planform, the N-20 embodied many features that were entirelly new at the time. Its powerplant consisted of four Swiss-designed turbofan engines buried in the wing. In each of these engines, the cold air from the fan was ducted through additional combustion chambers located on each side of the axial 'core', providing a reheat device that doubled the normal thrust and was intended for use during take-off and combat. For short take-off and landing, the secondary airflow could be diverted through large slots on the upper and lower wing surfaces. When only the lower slots were open the deflected air acted as an aerodynamic flap; with upper and lower surface slots open the deflected air acted as a thrust reverser.. As a substantial proportion of the airflow passed through the wing aerodynamic drag of the relatively thick section was kept low.
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Ground tests of the Aiguillon prototype began at Emmen in 1952 but, to the great disappointment of the designers, no flight tests were authorised due to lack of funds."
So if we read the above whilst looking at the Aiguillon 3-view drawing, the wing sections (both similar to post #22 here) and the photo we can begin to visualise the propulsion set up. The aircraft photo also has the engine under its wing, with the afterburners next to the engine.. there are other photos of the aircraft and engine here.
...and the gas generator? Well originally Fairey were going to use a RR Dart with auxiliary compressor on what became the Rotodyne... Hives pleaded too much work so Fairey decided to go with a Mamba plus auxiliary compressor, known as the Cobra. Like Rolls, A-S pleaded that they were too stretched (Python, Mamba- single and Double and F9 takeover) and so Fairey had to go elsewhere.
....tbcike Rolls
