Rolls Royce mulls civil supersonic opportunities

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MoreAviation

Rolls Royce mulls civil supersonic opportunities

#1 Post by MoreAviation » Sun Dec 27, 2015 12:08 pm

The Telegraph reports...

A new generation of supersonic aircraft could be powered by Rolls-Royce as the company draws on knowledge gained building Concorde’s engines.

The FTSE 100 engineering giant is understood to be interested in providing the engines for Aerion’s business jets, which will be capable of flying faster than the speed of sound.


http://www.telegraph.co.uk/finance/newsbysector/industry/12065294/Rolls-Royce-set-to-go-supersonic-again.html
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Re: Rolls Royce mulls civil supersonic opportunities

#2 Post by boing » Mon Dec 28, 2015 1:02 am

That engine arrangement will never work.

The inboard section of the wing will stall first disrupting airflow into the wing-mounted engines in a stall or upset. (BAC 1-11 anyone?)
The transonic shock-wave movement along the sharply swept section of the leading edge (no doubt intended to reduce C of L movement in the transition) will have interesting effects on the wing-mounted intakes.
The static C of G of the aircraft would appear to be uncomfortably far back, OK for a fighter with fly by wire but a bit tricky for long-range cruise stability. Very short control moment arm but very long fore-body.
The, presumably, slab type horizontal tail-plane is going to be presented with all sorts of interesting shock waves from that multitude of curved surfaces ahead of it.

Still, it looks good in the publicity photos.
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Re: Rolls Royce mulls civil supersonic opportunities

#3 Post by Boac » Mon Dec 28, 2015 11:15 am

boing wrote:That engine arrangement will never work. The inboard section of the wing will stall first disrupting airflow into the wing-mounted engines
- never mind the 'rams-horn' vortices at slow speed!

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Re: Rolls Royce mulls civil supersonic opportunities

#4 Post by MoreAviation » Tue Dec 29, 2015 10:01 am

Given that Aerion is working with Airbus and has full access to a supersonic wind tunnel, I suspect that is highly likely that their brains trust are on top of some of the issues highlighted on this thread.

Aerion is working with Airbus to manufacture these jets. According to original plans, these jets were intended to be powered by Pratt & Whitney's JT8D engines. However, in the summer it was decided to make the jets bigger. This forced the company to drop these engines and instead scout for others because a larger size meant more powerful engines. Also, the company wanted lower emissions from them, according to The Telegraph.


http://www.ibtimes.co.uk/rolls-royce-pitching-provide-engines-aerion-its-supersonic-business-jets-1535067

Aerion has landed an order for 20 of these aircraft...

Fractional jet supplier Flexjet has signed a firm order for 20 Aerion AS2 supersonic jets, providing a critical boost for the 12-year-old the high-speed aircraft development project.


https://www.flightglobal.com/news/articles/nbaa-flexjet-is-first-fleet-customer-for-aerion-419231/

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