Talk:Monopropellant

message: when it says otherwise mediocere, is that improper?  —Preceding unsigned comment added by 65.30.175.197 (talk) 04:29, 17 December 2007 (UTC)

message: *I don't think the articles should be merged. Monopropellant is a class of chemicals, whereas the rocket article mainly talks about hydrazine rockets. Also the rocket article is significant enough to remain a separate article due to the reference to space ships and satelites. Having said that, both of the articles could use some clean up to make them more distinct from each other.Hobo 02:19, 27 August 2006 (UTC)
thread_title: Merger

message: No mention of Hydroxylammonium nitrate or HAN?  I tried to briefly find a reference that was freely accesible but HAN is discussed mostly in technical papers such as those found on the AIAA site.  When I have more time i'll see what I can write up.  I do know it is bonded with Hydroxyl-terminated polybutadiene (HTPB) or Carboxy-Terminated Polybutadiene (CTPB) and requires preheating to 200-300 deg C to decompose.  Catylist is a noble metal, similar to the other monoprops that use silver or palladium.  —Preceding unsigned comment added by Integracer (talk • contribs) 18:09, 18 September 2007 (UTC)
thread_title:  HAN 

message: A rocket propellant consisting of a single substance, especially a liquid, capable of creating rocket thrust without the addition of a second substance.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
Gas(?): We came across Industrial Accidents reminiscent of the use of Hydrogen Cylinders (6000 PSI)(with the regulator hammered off) used as a missile as in the movie "Chain Reaction". Toy Rockets and Military Torpedoes have been powered by compressed air. Is Dry Ice in a pop bottle a monopropellant rocket?
Solid fuel:  Although its tempting to call all solid fuel monopropellant because only one chunk of stuff burns, proportion on components and improper mixing or component ratios are the same issues that one faces with binary liquids.  Aluminum and Ammonium Perchlorate powders are mixed with asphalt (old) or rubber (polymerized after mixing and molding) (see http://en.wikipedia.org/wiki/Ammonium_perchlorate_composite_propellant); it is a mixture not a monopropellant. The fuel in classic Jetex hobbyist rocket motors (http://jetex.org/motors/propellants.html) is Guanidine Nitrate (en.wikipedia.org/wiki/Guanidine_nitrate), a monopropellant. Impurities are added (and engines have safety mechanism) to make them more likely burn fast than explode. Ammonium Nitrate (see the wiki) can deflagarate or detonate, but can be used as monopropellant, and for more energy can be mixed with powdered sugar which is then not a monopropellant, but which can form a solution of Ammonium Nitrate and Sugar (no separate crystals) which is then a monopropellant. (See http://www.youtube.com/watch?v=jxznZal--do ;       )  Potassium Nitrate and Powdered Sugar is not a monopropellant, but at 220 degrees (decomposes violently at 240) sugar will dissolve the KNO3 and solidify to a solid solution (glass) which is a monopropellant (see http://www.youtube.com/watch?v=opk9Vqk77M4 et al; ) Ammonium Perchlorate (neat) could be a monopropellant, deflagarate or detonate depending on your luck. Guncotton,  Cellulose Dinitrate, would  be a monopropellant.
Liquid fuel: Hydrazine is used for space vehicle thrusters, it generates H2 and N2 gasses on contact with (esp Iridium) catalyst; (known by way of my work at Aerojet nee Rocket Reasearch)(en.wikipedia.org/wiki/Hydrazine). Hydrogen peroxide by itself. Solution of Ammonium Nitrate in Methanol.  Pure Nitromethane (en.wikipedia.org/wiki/Nitromethane ; http://www.hq.nasa.gov/pao/History/conghand/propelnt.htm ), and 40% Nitromethane/Methanol Radio Control car fuel. Ethylene Oxide (favored for fuel air explosives). Methyl Nitrite.  Nitrous Oxide. (see http://www.rocketmotorparts.com/resources.html). All except Nitrous Oxide and Hydrazine can be detonated. Article http://en.wikipedia.org/wiki/Otto_fuel_II refers to Torpedo engine monopropellant fuel rather than Rocketry fuels. Similarly, "Top Fuel Dragster" (http://en.wikipedia.org/wiki/Top_Fuelracers) use Nitromethane/Methanol because maximum power can be derived from a given engine displacement.
Basically if you need two fluid pumps or if you use one fluid pump and a heterogeneous solid reactant its not a monopropellant. Re: solutions, commonly understood monopropellants like Hydrazine and Hydrogen peroxide are often diluted with water (or the former with methanol) for ease of handling or stability.
I have a few years of amateur rocketry experience as well as many years as an industrial chemist, some of it with direct rocketry experience. Oxidizer and Rocket (empty) weight are important limitations.  Convenience and safety are important features as well. I've had fuel mixtures from Zinc/Sulfur to Gunpowder go off while tamping it into the engine (Friction, Static Electricity, or Pressure)(Moisture absorbed from the air can also initiate reaction). There was a disaster when someone in a rail yard inadvertently closed the vents on a rail car of Nitromethane, and it detonated. The sugar/nitrate glass burns with fewer issues and better repeatability. Hydrogen Peroxide (30%) was easy to get at Beauty Supply stores so I used that for my monopropellant rockets, it generated sufficient thrust so I never got around to building one with alcohol fuel. Methyl Nitrite is under its own pressure at Room Temperature.
Water and/or Methanol injection of Aircraft piston and jet engines provides additional power/thrust. This increase in exhaust volume comes at the expense of exhaust velocity (lower exhaust temperature). Note that LOX and LH2 produce a 2500 degree flame however the equilibrium for water decomposition is 2000 degees so thrust is acheived via Hydroxyl radicals and Hydrogen atoms, which continue to react after leaving the rocket engine (hence the huge flame).
Shjacks45 (talk) 21:27, 6 March 2011 (UTC)
thread_title:  Monopropellants 

message: Perhaps this could benefit from some editing:
"The most common use of monopropellants[2] is in low-impulse rocket motors[3], such as reaction control thrusters, the usual propellant being hydrazine[4][5] which is generally decomposed by exposure to an iridium[6][7] catalyst bed (Hydrazine is pre-heated to keep reactant liquid) to produce the desired jet of hot gas and thus thrust." Taliska (talk) 00:30, 24 November 2011 (UTC)
thread_title:  Awkward Sentence 

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