H2A japanese rocket aft section

[ace5]

What are the 2 small structures in the lower portion of the H2A 2024 version Japanese launcher. They semm to be two small engines for vernier control...

 

[hiro2002]

It's SSB<br />http://warp.ndl.go.jp/REPOSWP/000000001418/00000000000005995/www.nasda.go.jp/projects/rockets/h2a/dvp/ssb/index_e.html<br />http://www.jaxa.jp/pr/brochure/pdf/01/rocket01.pdf<br />http://www.jaxa.jp/projects/rockets/h2a/index_e.html<br />

 

[ace5]

No, Hiro, I know what are SSB and SRBs...<br /><br />I was refferring to the small structure beetween the two SSBs. But I learn that they are two auxiliary engines at the base of stage one.