Author Topic: Epsilon S Development Updates Thread (Read 39652 times)

russianhalo117 · « **on:** 06/12/2020 05:50 pm »

Epsilon S, like Vega-C and E, introduces commonality with H-III (H3) via switching to SRB-3 for the booster stage. Also many other enhancements and upgrades are planned, for instance a larger diameter third stage. This thread is for Updates.

Cross post (Permalink in Japanese):

Quote from: Fuji on 06/12/2020 12:15 pm

Epsilon S Launch Vehicle Project
https://www.jaxa.jp/press/2020/06/20200612-1-2_j.html

"S" means Synergy ×Speed ×Smart ×Superior ×Service

Closer to Space · « **Reply #1 on:** 06/13/2020 12:05 am »

I tried to translate the three graph that were on the site:

russianhalo117 · « **Reply #2 on:** 06/30/2020 08:00 am »

Official Agreement (MoU agreement previously signed) contracting the development, procurement and testing up to commercialisation.

russianhalo117 · « **Reply #3 on:** 07/06/2020 05:14 am »

Additional:

Steven Pietrobon · « **Reply #4 on:** 07/06/2020 10:37 am »

First launch schedule for 2023.

Launch will carry LOTUSat 1.

IHI Aerospace will be the commercial operator of Epsilon S.

bolun · « **Reply #5 on:** 07/16/2020 12:24 pm »

Webpage (English): https://global.jaxa.jp/projects/rockets/epsilon/index.html

----

Pamphlet & User's Manual

catdlr · « **Reply #6 on:** 06/05/2023 06:51 am »

....Bump after 300 days of no updates?? If there is a better place to post this let me know.

Noshiro Rocket Test Site E-31 Individual Rocket Motor Combustion Test

Quote

Scheduled for Jun 5, 2023
Noshiro Rocket Test Site E-31 Rocket Motor Combustion Test for Epsilon S Rocket 3rd Stage Scheduled Test Time: 10:00 Scheduled Combustion Time: 100 seconds

russianhalo117 · « **Reply #7 on:** 07/07/2023 05:31 am »

Epsilon-S Development status (and Epsilon-2 RTF??) conference:

lucas071200 · « **Reply #8 on:** 07/13/2023 05:51 pm »

Noshiro Rocket Test Site E-21 Individual Rocket Motor Combustion Test

DaveS · « **Reply #9 on:** 07/14/2023 12:14 am »

Epsilon S second stage motor suffers catastrophic failure ~58 seconds into test:

catdlr · « **Reply #10 on:** 07/14/2023 12:44 am »

The resulting fire continues long after the explosion. Looks like it's took out the GSE as well. If you look at the video, there is a jet of flames directed away from the building.

Galactic Penguin SST · « **Reply #11 on:** 07/14/2023 01:26 am »

Quote from: catdlr on 07/14/2023 12:44 am

The resulting fire continues long after the explosion. Looks like it's took out the GSE as well. If you look at the video, there is a jet of flames directed away from the building.

Yeah the test stand is definitely toast.

https://twitter.com/a2cplus/status/1679654885682479104

https://twitter.com/TobimonoGakkai/status/1679653159516655617

EDIT: Changes of the 2nd stage SRM from previous Epsilon launches:
https://twitter.com/Cosmic_Penguin/status/1679652295741702145

catdlr · « **Reply #12 on:** 07/14/2023 03:20 am »

A shortened replay video was published of the incident at a much better resolution and without all the screen clutter.

In the attached screen grab, there is a very bright object traveling from the test stand and moving upwards. It looks very hot and takes the route marked in green.

Epsilon S rocket 2nd stage motor firing test

HVM · « **Reply #13 on:** 07/14/2023 04:53 am »

No wonder it failed, a turbine in solid rocket motor ; )

Test stand and building:
https://twitter.com/eito_eito/status/1679702566706511872

Asteroza · « **Reply #14 on:** 07/14/2023 07:21 am »

The flying streak is likely a lit solid propellant fragment ejected out the back. Possible propellant grain failure?

Was this test supported by Parliament Funkadelic, because they nearly tore the roof off the ~~sucka~~ shed

woods170 · « **Reply #15 on:** 07/14/2023 08:25 am »

Quote from: catdlr on 07/14/2023 03:20 am

A shortened replay video was published of the incident at a much better resolution and without all the screen clutter.

In the attached screen grab, there is a very bright object traveling from the test stand and moving upwards. It looks very hot and takes the route marked in green. (Turbine perhaps?)

Epsilon S rocket 2nd stage motor firing test

Casual observation: solid rocket motors usually don't have turbines.
My guess is this was a fiercely burning fragment of solid propellant flying away.

HVM · « **Reply #16 on:** 07/14/2023 08:32 am »

Quote from: woods170 on 07/14/2023 08:25 am

...
Casual observation: solid rocket motors usually don't have turbines.
My guess is this was a fiercely burning fragment of solid propellant flying away.

What do you mean, there are at least eight ( 8 ) turbines in the video.

catdlr · « **Reply #17 on:** 07/14/2023 08:41 am »

Quote from: HVM on 07/14/2023 08:32 am

Quote from: woods170 on 07/14/2023 08:25 am
...
Casual observation: solid rocket motors usually don't have turbines.
My guess is this was a fiercely burning fragment of solid propellant flying away.
What do you mean, there are at least eight ( 8 ) turbines in the video.

Ok, OK, everyone, I get it. I didn't do enough background checking before making that comment. What you saw flying was my ass on fire.

edkyle99 · « **Reply #18 on:** 07/14/2023 03:43 pm »

Interesting that the camera began to shake shortly *before* the explosion could be seen. Resonance?

woods170 · « **Reply #19 on:** 07/14/2023 08:33 pm »

Quote from: HVM on 07/14/2023 08:32 am

Quote from: woods170 on 07/14/2023 08:25 am
...
Casual observation: solid rocket motors usually don't have turbines.
My guess is this was a fiercely burning fragment of solid propellant flying away.
What do you mean, there are at least eight ( 8 ) turbines in the video.

Touché.

But this ain't a party thread...