In November 2013, Lockheed Martin announced it was developing a similar SR-72 spy plane (illustrated) said to be able to accelerate up to Mach 6At around the same time, residents in locations including Buffalo, Cheektowaga, Clarence and as far north as Niagara Falls on the east coast of the US also took to social media to report the unusual noises.Twitter user Brailsford believes the noises were created by hypersonic booms (tweets pictured above).
In particular, an expert said the sound is similar to that created by pulse detonation engines.LAGOS, Nigeria, Capital Markets in Africa: Fitch Ratings-London-07 July 2016: Sovereign credit ratings are on track for a record number of downgrades in 2016, driven by the impact of lower commodity prices in emerging market economies, Fitch Ratings says in its latest bi-annual Sovereign Review and Outlook.There were 15 downgrades in 1H16 compared with the previous annual high of 20 in 2011, and 22 ratings are on Negative Outlook, suggesting this year's final total is likely to exceed that of...Aurora is rumoured to be a top secret aircraft that has been in development since 1989.These claims originated in Aviation Week and Space Technology magazine in 1989.A PDE can detonate between 60 and 100 times a second and its contrails appear to look like 'rings on a rope' (pictured), or a spine According to experts, including Dr Phillip Atcliffe, senior lecturer in aeronautical engineering at Salford University, if a passenger jet flew at Mach 6 at current jet altitudes of around 30,000ft (9,144 metres), the sonic boom could damage buildings.
One in particular, which Dr Bhupendra Khandelwal an engineering research associate from Sheffield believes may have caused the booms heard over the UK and New York, is called a pulse detonation engine (PDE), or pulse detonation wave engine (PDWE).
Rumours claim the Aurora may be equipped with air-to-ground weapons, but this would add weight to the craft, suggesting it is more likely that the plane would be used to reach destinations and reconnaissance missions instead.
An artist's illustration of what the Aurora plane could look like is pictured Aurora is rumoured to be a top secret aircraft that has been in development since 1989.
It could be a successor to the Mach 3.35 Lockheed Martin SR-71 Blackbird craft that was retired in 1998 (pictured).
These claims originated in Aviation Week and Space Technology magazine in 1989 A PDE engine works by using force from a series of explosions, caused by mixing a fuel mist and air intake, to thrust itself forward.
It can theoretically power planes at five times the speed of sound.