Author Topic: Redesigned HTV : HTV-X (Read 137162 times)

Steven Pietrobon · « **Reply #20 on:** 06/21/2019 06:55 am »

Looks like a more mass efficient design. The main propulsion thrusters have been deleted with all attitude thrusters consolidated to the service module. Thrusters are offset from the main body (looks like at 45 degrees). If the thrusters are pointing to the centre of mass, then can still get full efficiency.

Asteroza · « **Reply #21 on:** 06/21/2019 08:34 am »

Certainly, having an upside down config means they can also utilize some of the space in the top cone of a payload fairing to maximize unpressurized cargo volume, plus the mount is an easy flat plate to work with. The solar panels being close to the thruster packs at first glance seems problematic, but it looks like the nozzle orientations mitigate that mostly.

JEF_300 · « **Reply #22 on:** 06/21/2019 02:23 pm »

If I'm following the timeline correctly here, in 2015, this was the design:

And in 2017, this was the design.

Is your image an up to date representation?

Quote from: vp. on 06/21/2019 05:09 am

russianhalo117 · « **Reply #23 on:** 06/21/2019 05:25 pm »

Quote from: JEF_300 on 06/21/2019 02:23 pm

If I'm following the timeline correctly here, in 2015, this was the design:

And in 2017, this was the design.

Is your image an up to date representation?

Quote from: vp. on 06/21/2019 05:09 am

Image 3 title shows October 15 2016 as original date.

Tywin · « **Reply #24 on:** 06/21/2019 07:45 pm »

I hope we see a future version for the Gateway station...and manned HTV one day...

brickmack · « **Reply #25 on:** 06/21/2019 11:49 pm »

Quote from: Tywin on 06/21/2019 07:45 pm

I hope we see a future version for the Gateway station...and manned HTV one day...

HTV-X will support Gateway flights, both as a cargo vehicle and possibly module tug (was at one point proposed as the delivery vehicle for ESPRIT, with launch on either Falcon Heavy or Ariane 6). Design changes for this seem to be relatively minimal. Manned HTV seems to be off the table now, but there were plenty of older studies on the subject (and manned ATV) that might interest you

yoichi · « **Reply #26 on:** 10/31/2019 06:20 am »

press conference

https://fanfun.jaxa.jp/jaxatv/files/20191031_htv-x.pdf

TrevorMonty · « **Reply #27 on:** 10/31/2019 01:27 pm »

Translation would be useful.

lucspace · « **Reply #28 on:** 10/31/2019 01:44 pm »

Translation using Google

russianhalo117 · « **Reply #29 on:** 04/24/2020 02:10 am »

JAXA 2020 HTV-X CGI Animation:

Steven Pietrobon · « **Reply #30 on:** 04/24/2020 05:46 am »

Some screen grabs.

Welsh Dragon · « **Reply #31 on:** 04/24/2020 09:14 am »

Any ideas about the V-shaped solar panel arrangement? To provide better clearance for berthing manoeuvres?

JEF_300 · « **Reply #32 on:** 05/07/2020 02:55 am »

Quote from: Welsh Dragon on 04/24/2020 09:14 am

Any ideas about the V-shaped solar panel arrangement? To provide better clearance for berthing manoeuvres?

Bumping this, since I've been wondering about this myself.
Whatever the reason, the slanted panels do look very, very good.

TorenAltair · « **Reply #33 on:** 05/07/2020 09:49 am »

Quote from: Welsh Dragon on 04/24/2020 09:14 am

Any ideas about the V-shaped solar panel arrangement? To provide better clearance for berthing manoeuvres?

Better clearance might be one reason. Another reason might be available power. Once docked, the panels can‘t follow the sun any longer. With this arrangement, it might generate more energy iterated over one orbit although reducing peak power. The panels shouldn‘t be shaded as much as straight ones by the station as well.

Edit: typo

Olaf · « **Reply #34 on:** 05/19/2020 06:16 pm »

https://www.nasa.gov/press-release/nasa-tv-to-air-launch-capture-of-cargo-ship-to-international-space-station

Quote

JAXA is developing a new class of HTV vehicles that will provide a reusable pressurized cargo section

That is really new. How will this work?

Quote

The new HTV-X vehicles will dock automatically to the station’s International Docking Adapters with the first flight scheduled in 2022.

whitelancer64 · « **Reply #35 on:** 05/19/2020 06:31 pm »

Quote from: Olaf on 05/19/2020 06:16 pm

https://www.nasa.gov/press-release/nasa-tv-to-air-launch-capture-of-cargo-ship-to-international-space-station

Quote
JAXA is developing a new class of HTV vehicles that will provide a reusable pressurized cargo section
That is really new. How will this work?

Quote
The new HTV-X vehicles will dock automatically to the station’s International Docking Adapters with the first flight scheduled in 2022.

The pressurized section would have a heatshield and would separate from the rest of the HTV to be recovered, like Cargo Dragon. The idea is not new, it has been kicked around for at least a decade, however, I was under the impression that it had been set aside, in favor of a lighter, not-reusable pressurized section.

It may be an error on the part of the author of the article.

russianhalo117 · « **Reply #36 on:** 05/19/2020 07:32 pm »

Quote from: whitelancer64 on 05/19/2020 06:31 pm

Quote from: Olaf on 05/19/2020 06:16 pm
https://www.nasa.gov/press-release/nasa-tv-to-air-launch-capture-of-cargo-ship-to-international-space-station

Quote
JAXA is developing a new class of HTV vehicles that will provide a reusable pressurized cargo section
That is really new. How will this work?

Quote
The new HTV-X vehicles will dock automatically to the station’s International Docking Adapters with the first flight scheduled in 2022.

The pressurized section would have a heatshield and would separate from the rest of the HTV to be recovered, like Cargo Dragon. The idea is not new, it has been kicked around for at least a decade, however, I was under the impression that it had been set aside, in favor of a lighter, not-reusable pressurized section.

It may be an error on the part of the author of the article.

The use of IDA doesn't match the 2020 JAXA animations and information for HTV-X1. The manufacturer documentation has a primary PLC with a PCBM. The Service Module has a pass thru tunnel to an optional/experimental secondary PLC which has an IDSS docking system which is exposed when removing the optionally releasable ULC (EP). It prohibits flying external cargo on one side of the ULC.
When the pass thru tunnel is not used it is filled with additional tube cylindrical commodity tanks. There is no public date and assigned mission (NET HTV-X3) to fly the experimental JAXA IDSS docking system which is to be tested at ISS and is part of their international logistics, module, crew/science transfer vehicle gateway contribution proposals/plans.

NSF as echoed in the past could request newer information when feasible. The gateway info is also found in the H-3 upgrades posts.

https://forum.nasaspaceflight.com/index.php?topic=37623.msg2010006#msg2010006

https://spacenews.com/mitsubishi-heavy-industries-mulls-upgraded-h3-rocket-variants-for-lunar-missions/

nacnud · « **Reply #37 on:** 05/19/2020 08:41 pm »

Quote from: Olaf on 05/19/2020 06:16 pm

Quote
JAXA is developing a new class of HTV vehicles that will provide a reusable pressurized cargo section
That is really new. How will this work?

Is it a mistake in translation? Wikipedia says HTV-X has the same pressurised cargo section as HTV so maybe it should say reused (as in the design) rather than reusable?

russianhalo117 · « **Reply #38 on:** 05/19/2020 10:04 pm »

Quote from: nacnud on 05/19/2020 08:41 pm

Quote from: Olaf on 05/19/2020 06:16 pm
Quote
JAXA is developing a new class of HTV vehicles that will provide a reusable pressurized cargo section
That is really new. How will this work?

Is it a mistake in translation? Wikipedia says HTV-X has the same pressurised cargo section as HTV so maybe it should say reused (as in the design) rather than reusable?

It is similar in dimensions but longer also 2 internal configurations (current CBM sized rack and pallet system and IDSS sized cargo configuration for later ISS and gateway flights) refer to my previous posts first link.

soltasto · « **Reply #39 on:** 05/25/2020 11:37 am »

I might have understood from the NASA live stream that is covering the berthing of HTV-9 that the next HTV flight, which will be an HTV-X, will dock to the ISS. Can anyone confirm?