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Author Topic: Aerion SBJ  (Read 33433 times)

Offline Aeroengineer1

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Re: Aerion SBJ
« Reply #90 on: November 03, 2018, 11:06:02 pm »
Often times, things succeed because it is not only the right technology, but also at the right time.  Sonic Cruiser was an example of this.  It had the tech, but then 9/11 happened, and many, many things changed.  In the case of Aerion, they may be able to make it work.  I am not too worried about the engine tech.  This is essentially a derivative engine.  Airframe integration will be the harder part of it. 

As for if Mach .92 vs Mach 1.4 will make a difference, well you will get there 40-50% faster.  Heck when we drive on the road, we are content to do 10-15% faster.  This essentially means that a person can leave the East Coast of the US, and be in London in about 4-4.5 hours vs the typical 7 hours.  It is now possible to do the flight, with a couple of hours of meetings, then return in the same day, and only have a 12-14 hour day.  This can be done, vs an 18-20 hour day which is less likely.  Admittedly, the market is going to be small, but it will be there.  The bigger question is if it is financially viable.

Offline Trident

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Re: Aerion SBJ
« Reply #91 on: November 04, 2018, 01:38:17 pm »
... and lowering ambition to a Mach 1.4 top speed takes care of the airframe integration challenge to some extent, because they get away with fixed normal shock intakes.

Offline Sundog

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Re: Aerion SBJ
« Reply #92 on: November 04, 2018, 02:03:10 pm »
... and lowering ambition to a Mach 1.4 top speed takes care of the airframe integration challenge to some extent, because they get away with fixed normal shock intakes.

The Aerion does have fixed inlets, but they aren't normal shocks, they're actually swept, so they are 2D shocks, which makes them more efficient. The real savings in terms of keeping the speed in the mid Mach number region, between one and two, is in materials. They don't require exotic materials to handle thermal loads.

Offline Trident

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Re: Aerion SBJ
« Reply #93 on: November 04, 2018, 03:04:57 pm »
The Aerion does have fixed inlets, but they aren't normal shocks, they're actually swept, so they are 2D shocks, which makes them more efficient. The real savings in terms of keeping the speed in the mid Mach number region, between one and two, is in materials. They don't require exotic materials to handle thermal loads.

While the cowl is swept, cross section is round, so I'm having some trouble working out how an oblique shock is supposed to form without a conical centerbody? At these low Mach numbers the ramp/cone angle would also have to be extremely shallow (<9.5 wedge) which may conflict with the relatively blunt lip radius seen in the CGI pictures. In this Mach range you seem to get a normal shock if you so much as look at the flow the wrong way, and the total pressure recovery difference between a 5 wedge with oblique+normal shock and a normal shock is only ~1.5% (M=1.4, below this the difference would be even less) anyhow.

I suspect the sweep may be more related to high AoA take-off/landing conditions (and possibly noise, for the inverse sweep intake on the centerline engine). Materials is a good point though!

Offline fredymac

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Re: Aerion SBJ
« Reply #94 on: November 08, 2018, 05:38:58 am »
Some details on the engine.


Offline Flyaway

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Re: Aerion SBJ
« Reply #95 on: February 05, 2019, 12:50:47 pm »
Boeing to help Aerion develop AS2 supersonic jet

Quote
Boeing has become the latest and biggest aerospace company to partner with supersonic business jet developer Aerion.

Offline LowObservable

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Re: Aerion SBJ
« Reply #96 on: February 05, 2019, 03:14:22 pm »
You have to give the guys some credit for forming partnerships with Airbus, LockMart, GE and then Boeing before they cut metal.

Offline TomcatViP

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Re: Aerion SBJ
« Reply #97 on: February 05, 2019, 04:08:25 pm »
Except that LM, Boeing and GE came to finalize the design where Airbus jumped out having achieved not much (at least, not the propulsion solution, neither advanced anything around the Laminar wing and not conducted any system integration)...

I wonder if Boeing is not there to provide its expertise in designing large and complex fuselage sections at low cost.

Offline Arjen

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Re: Aerion SBJ
« Reply #98 on: February 06, 2019, 12:17:44 am »
FINALIZE the design? Aerion and its predecessor have been at it for decades now, who knows when this will take to the air? If ever?

Offline TomcatViP

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Re: Aerion SBJ
« Reply #99 on: February 06, 2019, 09:33:27 am »
I have to admit the use of an  assertive form was a big step into the unknown.

Offline Arjen

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Re: Aerion SBJ
« Reply #100 on: February 06, 2019, 10:35:32 am »
Does assertive apply to Aerion's design or to your use of language? Honest question.

Offline TomcatViP

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Re: Aerion SBJ
« Reply #101 on: February 06, 2019, 10:42:27 am »
 :P   :o ::) ;D