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I'm searching for any design file or deep-info on the MT-135 rocket, the fuel used, engines, engines info, any thing really. I have deep-searched on tons of sites but I just find few missions that used this rocket; I would like all the possible info. Thanks and regards.

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  • $\begingroup$ Are you looking for info beyond what’s on this JAXA page? It is more detailed than what I usually expect to find about sounding rockets. $\endgroup$ – Russell Borogove Nov 9 '20 at 22:45
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    $\begingroup$ @RussellBorogove yes, i check that page, but im searching info more technical, for example, the name of engines, fuel type, etc.. $\endgroup$ – Valentino Zaffrani Nov 9 '20 at 23:44
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According to the JAXA page about the rocket, it's a solid-fuel motor:

The propellant, a pre-formed grain, polyurethane composite with a low burning rate...

By polyurethane composite I assume they mean HTBP plus ammonium perchlorate and aluminum powder, since that's what JAXA generally uses for solid rockets. Since it's a solid rocket stage, the motor itself doesn't have its own name or an identity outside of the MT-135.

The page gives quite a bit of information about the construction as well:

The [combustion] chamber is built up by welding tubes made of chromium-molybden steel, and the outer edge of the nozzle is welded to it. The throat insert material is graphite, and the exit cone is made of ablative silica-phenolic FRP [fiber-reinforced phenolic, i.e. fiberglass]

The motor casing in the later MT-135P is recoverable by parachute, but the nozzle materials are ablative, so would be replaced after each flight.

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    $\begingroup$ Very usseful info! Thanks for that. And other thing, you have any idea to improve this rocket? i mean, this rocket is from 60's and, maybe a new fuel or something, you have something in mind? just guessing, this answere help me a lot! $\endgroup$ – Valentino Zaffrani Nov 10 '20 at 3:28

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