JAXA next-gen SST

Triton · 9 December 2013

Source:
http://rental-k.net/topics/archives/7051.html

Triton · 9 December 2013

Source:
http://h.hatena.ne.jp/sdkfz/299906217221464934

Triton · 11 June 2014

Artist's impression of JAXA quiet supersonic transport concept with low-boom features.

Source:
http://www.aero.jaxa.jp/eng/publication/magazine/pdf/enprint0304.pdf
https://twitter.com/TheWoracle/status/455745501502001152

totoro · 12 June 2014

for 50 people? that bit and the fact the whole plane looks fairly small - makes me believe they're aiming at short to medium range market. Which is of course a mistake. A supersonic plane is pointless unless it can shave off several hours of a single trip. If one shaved off 50% of flight duration for a flight that'd otherwise last 2-3 hours - that's overall insignificant, when one takes into account check in, baggage claim, trip to and from the airport etc. And on top of all that supersonic flight is likely to be more expensive. Even a rich customer may balk at a 50-200% more expensive ticket if the whole trip experience is shortened from 4 hours to 3 hours. LA to NY distances, London to Istanbul and so on - those are pointless for a mach 2 plane. One needs to be able to do it at least over the atlantic, like concorde did. Ideally, transpacific flights too.

I know jaxa has been talking about making the ticket price comparable to subsonic airliners but i have a feeling they are using a fixed goalpost, fuel consumption in airliners today, as opposed to using a more realistic moving goalpost - fuel consumption of subsonic airliners 10, 20 or 30 years from today.

blackkite · 12 July 2014

Hi!
http://www.aero.jaxa.jp/spsite/d-send2/pdf/dsend2-2nd-poster.pdf

http://www.aero.jaxa.jp/eng/research/frontier/sst/concept.html

http://www.aero.jaxa.jp/eng/publication/magazine/

Cy-27 · 18 July 2014

Some more items on the Japan Aerospace Exploration Agency (JAXA) D-Send (Drop test for Simplified Evaluation of Non-symmetrically Distributed) silent supersonic boom project.

fightingirish · 29 August 2014

Status update and Cutaway of the Silent SuperSonic Concept Model (S3CM)

August 26, 2014 (JST)
Japan Aerospace Exploration Agency
The Japan Aerospace Exploration Agency (JAXA) had been planning on implementing the second phase of the Drop test for the Simplified Evaluation of non-Symmetrically Distributed sonic boom Project (D-SEND#2) at the Esrange Space Center in Sweden. However, as meteorological conditions were not ideal, JAXA was not able to carry out the test flight within the test window period.

Technology to decrease the sonic boom is said to be one of the most critical issues in realizing supersonic civil transport in the future. Through the D-SEND Project, JAXA aims to demonstrate the possibilities of the “low sonic boom design concept” through flight tests and also to obtain technologies and/or data that can be used to contribute to the deliberation of the international standardization of next generation supersonic transport, which is currently being studied globally.

In the D-SEND#2, a supersonic experimental airplane model, designed using JAXA’s original “low sonic boom model concept”, was to be flown at supersonic velocity by way of free falling from a balloon, during which generated sonic boom wave signatures were to be measured to confirm and validate the design concept.

In light of the situation, JAXA will review further test plans for the D-SEND#2. Updates will be released as soon as a further decision is made.

Sources:
http://aerospace.firetrench.com/2014/08/status-of-the-d-send2/
http://global.jaxa.jp/press/2014/08/20140826_dsend2.html
http://www.aero.jaxa.jp/eng/research/frontier/sst/d-send.html

hesham · 29 August 2014

Nice find my dear Rolf.

fightingirish · 27 July 2015

Results for the second phase of the “Drop test for the Simplified Evaluation of Non-symmetrically Distributed sonic boom” Project (D-SEND#2)

blackkite · 30 July 2015

Hi!
You can see lunch/lift and glider separation movie in this video.

And pfd file.
http://www.aero.jaxa.jp/spsite/d-send2/pdf/dsend2-rep20150727.pdf
https://www.youtube.com/watch?v=K8af9rZftSA

blackkite · 30 July 2015

Videos.
http://www.aero.jaxa.jp/spsite/d-send2/news.html

https://www.youtube.com/watch?v=3O7Dksqbcy4

blackkite · 30 July 2015

Hi HST!
https://www.youtube.com/watch?v=Tdy0WNMkyRA

blackkite · 24 October 2015

Hi!
Freezed Japanese unmanned flyer.
You can see impressive fuselage tail bottom shape to reduce sonic boom.(No.4 picture)
Engine nacelle design is same as Lockheed LBFD which Steve showed us recently.

blackkite · 25 October 2015

Hi! JAXA HST model in 2012.

fredymac · 8 November 2015

English annotated view of the HST engine. It appears to be a Liquid Air Cycle Engine extracting liquid O2 from the air for direct combustion downstream. Isn't this what the Skylon SABRE does?
NOTE: for some reason the animated GIF doesn't work unless you click it

mz · 8 November 2015

fredymac said:
English annotated view of the HST engine. It appears to be a Liquid Air Cycle Engine extracting liquid O2 from the air for direct combustion downstream. Isn't this what the Skylon SABRE does?
NOTE: for some reason the animated GIF doesn't work unless you click it

I think it's just a precooler. No liquifier. Also all intake mass still goes to the jet engine. (Some of the hydrogen does go to the afterburner.) As comparison, Sabre has an additional rocket engine there.

Reaction Engines' Scimitar however is designed for a lower speed, only Mach 5 and is a precooled jet engine. It still has a bypass channel.

http://reactionengines.co.uk/mach5cruise.html

blackkite · 24 November 2015

Hi!
D-SEND#2 picture and test result.

Red line : Sonic boom signature without low boom technology(thoretical value)
Blue line : D-SEND#2 sonic boom test result
JAXA says that to apply this low boom technology to Concorde, sonic boom level is half(1psf).(Concorde sonic boom level : 2psf)
To apply this low boom technology to 50 passenger class SSBJ(below pictures), sonic boom level is 1/4(0.5psf) compared with Concorde.
psf ; pound/square feet

http://www.jaxa.jp/press/2015/10/20151027_dsend2_j.html

blackkite · 29 November 2015

You can hear sonic boom at mach1.39 in measurement phase.
https://www.youtube.com/watch?v=TcS5wgqznqs

turboshaft · 30 November 2015

Recent presentation on the HIgh speed Key technologies for future Air transport (HIKARI) project being undertaken jointly by the EU and Japan:

http://www.aerodays2015.com/wp-content/uploads/sites/20/6E-Emmanuel-Blanvillain.pdf

One interesting conclusion:

Mach 5 is the best compromise speed

(Background at http://www.hikari-project.eu/main)

blackkite · 3 February 2024

Aviation Technology Directorate

JAXA Aviation Technology Directorate helps to create a safer and more prosperous society with aeronautics-related research and development activities.

www.aero.jaxa.jp

View: https://www.youtube.com/watch?time_continue=16&v=2NtyPfeNbEk&embeds_referring_euri=https%3A%2F%2Fwww.aero.jaxa.jp%2F&source_ve_path=Mjg2NjY&feature=emb_logo

blackkite · 3 February 2024

JAXA Low-Boom Research Could Ease Supersonic Certification | Aviation Week Network

A robust low-boom design method developed by Japanese researchers should make it easier to certify future quiet supersonic transports, the Japan Aerospace Exploration Agency (JAXA) says.

aviationweek.com

JAXA next-gen SST

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