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International Space Flight (ESA, Russia, China and others) => Japanese Launchers => Topic started by: Fuji on 05/20/2015 02:55 PM

Title: Redesigned HTV:HTV-X
Post by: Fuji on 05/20/2015 02:55 PM
MEXT(Ministry of Education, Culture, Sports, Science and Technology) announced redesigned HTV concept for 50% cost reduction.
This version will be introduced started from HTV10.

http://mainichi.jp/select/news/20150520k0000e040188000c.html 
Title: Re: Redesigned HTV :HTV10
Post by: Galactic Penguin SST on 05/20/2015 03:23 PM
If my (very bad) understanding of Japanese is correct, they are looking at cutting the cost by about 100 billion yen (~$US 82m) and lighten the spacecraft up by 30%, is that correct?

Title: Re: Redesigned HTV:HTV-10
Post by: baldusi on 05/20/2015 03:57 PM
This would be launched on an H-2A-204?
Title: Re: Redesigned HTV:HTV-10
Post by: russianhalo117 on 05/20/2015 09:42 PM
MEXT(Ministry of Education, Culture, Sports, Science and Technology) announced redesigned HTV concept for 50% cost reduction.
This version will be introduced started from HTV10.

http://mainichi.jp/select/news/20150520k0000e040188000c.html 

Link now gives an Error 404 Message. Can you find the new link please.
Title: Re: Redesigned HTV:HTV-10
Post by: russianhalo117 on 05/20/2015 09:46 PM
This would be launched on an H-2A-204?
There are H2B's in bulk order that go past HTV-9 these might be left over from now shelved HTV-R programme. There is/was a plan to flyout H-IIB and and transition  over to H-III (H-X). I dont have a config for that plan.
Title: Re: Redesigned HTV:HTV-10
Post by: Pipcard on 05/21/2015 08:50 AM
There is a 404 error because the link has an extra space at the end.

Here is a proper link (http://mainichi.jp/select/news/20150520k0000e040188000c.html).

Notice what appears to be a unpressurized trunk in the rear, and how they are planning to change from solar panels wrapped around cylindrical body to folding solar paddles (while SpaceX is planning to do the opposite for their Dragon V2), which seem to have a lot more surface area.
Title: Re: Redesigned HTV:HTV-10
Post by: Fuji on 05/21/2015 12:43 PM
If my (very bad) understanding of Japanese is correct, they are looking at cutting the cost by about 100 billion yen (~$US 82m) and lighten the spacecraft up by 30%, is that correct?



That' right

Usually, MEXT's meeting presentation documents are released one or two weeks later.
I will post here at that time.
Title: Re: Redesigned HTV:HTV-10
Post by: Ronsmytheiii on 05/22/2015 02:57 AM
Here is a larger image of the HTV V2:

Also, seems to me to be a remodel more like a Cygnus with unpressurized cargo now on the SM. Guessing it uses more commercial satellite components, plus ditching the unpressurized section saves weight so it can launch on the H-2

http://uchu2ch.blog.jp/archives/31003426.html
Title: Re: Redesigned HTV:HTV-10
Post by: Fuji on 05/31/2015 02:29 PM
Official document.  Useful information are not so many.
Avionics Module and Propulsion Module are integrated in a Service  Module.

http://www.mext.go.jp/b_menu/shingi/gijyutu/gijyutu2/071/shiryo/__icsFiles/afieldfile/2015/05/28/1358152_1.pdf
Title: Re: Redesigned HTV:HTV-10
Post by: russianhalo117 on 05/31/2015 06:16 PM
Official document.  Useful information are not so many.
Avionics Module and Propulsion Module are integrated in a Service  Module.

http://www.mext.go.jp/b_menu/shingi/gijyutu/gijyutu2/071/shiryo/__icsFiles/afieldfile/2015/05/28/1358152_1.pdf
Forwarded to Chris Bergin for a future HTV Article around the time of next HTV launch. All Future documents and info please pass along to Chris. the more info we give him the better the article.
Title: Re: Redesigned HTV:HTV-10
Post by: Patchouli on 06/08/2015 12:53 AM
If the payload is not too significantly reduced the cost could be competitive with the US commercial cargo carriers.
Spacex would still beat them and possibly SNC as well.
Title: Re: Redesigned HTV:HTV-10
Post by: Fuji on 07/09/2015 12:59 PM
This redsigned HTV is now called HTV-X.
Title: Re: Redesigned HTV:HTV-10
Post by: Ronsmytheiii on 01/24/2016 12:41 PM
New presentation goes into more detail:

http://www.mext.go.jp/b_menu/shingi/gijyutu/gijyutu2/059/shiryo/__icsFiles/afieldfile/2015/07/16/1359656_5.pdf
Title: Re: Redesigned HTV:HTV-10
Post by: russianhalo117 on 01/27/2016 01:32 AM
New presentation goes into more detail:

http://www.mext.go.jp/b_menu/shingi/gijyutu/gijyutu2/059/shiryo/__icsFiles/afieldfile/2015/07/16/1359656_5.pdf
I showed Chris and we could use an English translation whenever possible from anyone who can
Title: Re: Redesigned HTV:HTV-10
Post by: Danderman on 01/27/2016 11:41 PM
First one is scheduled to fly in 2021. With the normal delays, that would probably be 2025.

Title: Re: Redesigned HTV:HTV-10
Post by: yoichi on 07/14/2016 01:51 PM
http://www.jaxa.jp/press/2016/07/20160714_htv-x_j.html
The development status of the HTV-X
http://www.jaxa.jp/press/2016/07/files/20160714_htv-x_01_j.pdf
(685KB/Japanese)
Title: Re: Redesigned HTV:HTV-X
Post by: Galactic Penguin SST on 12/12/2017 08:43 AM
The design of HTV-X seems to have somewhat evolved (now back to near current HTV sized instead of the original lighter design). Here is the PDR presentation a week ago (targeting first flight in 2021) (in Japanese): http://www.jaxa.jp/press/2017/12/files/20171206_HTV-X.pdf (http://www.jaxa.jp/press/2017/12/files/20171206_HTV-X.pdf)