2019年8月1日 · The reason you go with UDMH/NTO F/O pair is storability, i.e. the ability of your rocket or missile to be stored, fully fueled straight from the factory, in a silo or stand on a launch rack for an extended amount of time, possibly years or even decades, and ready to use at a moment's notice, and spontaneous combustion upon contact with no ignition, meaning no fireplugs or glow wires or squib ...

2015年7月19日 · UDMH/N 2 O 4 is extremely acidic, toxic, sensitive to air, and apparently has just about every other terrible chemical property imaginable. It's hard to handle (transport and fuel up), requiring a lot more safety precautions (expenses).

2013年8月11日 · Hydrazine 1010 @ 20 deg. C Hydyne 855 @ 15 deg. C MMH 878 @ 20 deg. C UDMH 789 @ 15 deg. C Source: Modern Engineering for Design of Liquid-Propellant Rocket Engines, Huzel, Huang. 1992. P.21. I heartily recommend a great and really funny story of propellants research - John D. Clark.

both propellants are non-cryo, e.g. the UDMH/NTO-fueled RD-275Ms on the Proton? If the propellants are storable and hypergolic and suppose you are a rocket engineer to build one of these engines for military people who want rockets to remain in silos for years and launch at a moment's notice, can you simply turn the fuel/oxidizer main valves to ...

2020年4月2日 · The freezing point of SDMH is -8.9°C and UDMH is -57.7°C.UDMH has the lowest freezing point and has enough thermal stability to be used in large regeneratively cooled engines. Lower melting point ensures storing at low temperature for longer time & greater safety of this toxic chemical.So, this may be the prime reason.

2020年4月10日 · Unsymmetrical dimethlyhydrazine or "UDMH" is a propellant which has been used by Russian, American, European, Chinese, and Indian rockets. Russian rocket engineers nickname it "heptyl". Why was this name chosen, especially when it means a compound with 7 carbon atoms, and UDMH has only two?

2017年9月4日 · Accompanying a newsreader's report of North Korea's launch of a new long-range (claimed up to 10,000km) missile is footage of a launch in which the rocket produces clouds of orange/brown smoke. According to this Wikipedia page, it would seem to be the Hwasong-14, said to be based on a Russian design burning dinitrogen tetroxide and UDMH.

2016年2月20日 · The Titan II also used storable propellants: Aerozine 50, which is a 1:1 mixture of hydrazine and unsymmetrical dimethylhydrazine (UDMH), and dinitrogen tetroxide. As to why those chemicals burn with a colorless flame, I can tell you that it has to do with electron configurations and excitation states, but for any more detail, you might want to ...

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2022年2月11日 · Hydrazine, as for small monopropellant thrusters, has been in use for decades on hundreds of satellites. One model the "1N Monopropellant Hydrazine Thruster" is claimed to be in use in 165 units.