Avro Vulcan
Engine
### Engine

[thumb\|Air intake integrated in the wing, for the Olympus jet engines](/wiki/File:Royal_Air_Force_Museum_Hendon_%2814195378374%29.jpg "Royal Air Force Museum Hendon (14195378374).jpg")

The [Rolls\-Royce Olympus](/wiki/Rolls-Royce_Olympus "Rolls-Royce Olympus"), originally known as the "Bristol BE.10 Olympus",Baxter 1990, p. 18\. is a two\-spool, [axial\-flow](/wiki/Axial-flow "Axial-flow") [turbojet](/wiki/Turbojet "Turbojet") that powered the Vulcan. Each Vulcan had four engines buried in the wings, positioned in pairs close to the fuselage. The engine's design began in 1947, intended to power the [Bristol Aeroplane Company](/wiki/Bristol_Aeroplane_Company "Bristol Aeroplane Company")'s own rival design to the Vulcan.Baxter 1990, p. 13\.

[thumb\|Gas\-flow diagram of an Olympus Mk 101 engine](/wiki/File:Bristol_Olympus_101_gas_flow_diagram.jpg "Bristol Olympus 101 gas flow diagram.jpg")

As the prototype Vulcan VX770 was ready for flight prior to the Olympus being available, it first flew using [Rolls\-Royce Avon](/wiki/Rolls-Royce_Avon "Rolls-Royce Avon") RA.3 engines of  thrust. These were quickly replaced by [Armstrong Siddeley Sapphire](/wiki/Armstrong_Siddeley_Sapphire "Armstrong Siddeley Sapphire") ASSa.6 engines of  thrust.Laming 2002, pp. 45, 46\. VX770 later became a flying test bed for the [Rolls\-Royce Conway](/wiki/Rolls-Royce_Conway "Rolls-Royce Conway").Laming 2002, p. 108\. The second prototype VX777 first flew with Olympus 100s of  thrust. It was subsequently re\-engined with Olympus 101 engines.Laming 2002, p. 47\. When VX777 flew with a Phase 2C (B.2\) wing in 1957, it was fitted with Olympus 102 engines of  thrust.Laming 2002, p. 63\.

Early B.1s were equipped with the Olympus 101\. Later aircraft were delivered with Olympus 102s. All Olympus 102s became the Olympus 104 on overhaul and ultimately  thrust on uprating.Baxter 1990, pp. 44–46\. The first B.2 flew with the second\-generation Olympus 200,Baxter 1990, p. 50\. design of which began in 1952\.["16,000 lb Thrust."](http://www.flightglobal.com/pdfarchive/view/1957/1957%20-%200198.html?tracked=1) *Flight,* 15 February 1957, p. 200\. Subsequent B.2s were engined with either the uprated Olympus 201 or the Olympus 301\. The Olympus 201 was designated 202 on being fitted with a rapid air starter.Baxter 1990, pp. 50–64\. The engine would later be developed into a [reheated](/wiki/Reheat "Reheat") (afterburning) powerplant for the cancelled TSR\-2 strike/reconnaissance aircraft and the [supersonic passenger transport](/wiki/Supersonic_transport "Supersonic transport") [Concorde](/wiki/Concorde "Concorde").Buttler 2007, p. 72\.

Around 90% power, the engines in the Vulcan would emit a distinctive "howl"\-like noise["We all love the howl"](http://www.vulcantothesky.org/news/526/82/We-all-love-the-howl.html)  *Vulcan To The Sky Trust*, 13 December 2013\. due to the air intake arrangement, which became an attraction at public airshows.["Will 'howl' of the Vulcan bomber be heard over Bournemouth again?"](http://www.bournemouthecho.co.uk/news/4823500.Will__howl__of_the_Vulcan_bomber_be_heard_over_Bournemouth_again_/) The Daily Echo, 30 December 2009\.["Vulcan XH558 Awesome Howl Sounds"](https://www.youtube.com/watch?v=H_ARSE8jEHQ) *YouTube*, 28 October 2012\.


When did VX777 first fly with an Olympus 101 engine?