12 replies to this topic

[McDee]

how can i make rocket motor from nh4no3 without kno3?
thank in advance.

[lew]

1. Go into your pyro workshop.
2. Take outyour container of NH4NO3.
3. Put the lid on your container, tighten well.
4. Put the container in a safe place (you will not be needing this for a while!)
5. Go to your kitchen, and make a nice cup 'o' tea.
6. Return to the comfort of your living room/ bedroom/study etc.
7. Enjoy the afore mentioned hot beverage, and log onto the 'world wide web' using your computer.
8. Access this very website and take note of the little white box in the top right corner.
9. Enter questions or key words in this box.
10. you will be rewarded with knowledge - some usefull, some not, but nearly all relevant in one way or another.

And there you go - Ten magical steps to enlightenment.

[BigG]

McDee - Ammonium Nitrate is not used in Pyrotechnic - it's hygroscopic. Please look up ammonium nitrate on the forums. Ammonium Nitrate with other commonly used pyrotechnic chimicals can create deadly mixtures. Please don't use it.

[pyromaniac303]

McDee - Ammonium Nitrate is not used in Pyrotechnic - it's hygroscopic. Please look up ammonium nitrate on the forums. Ammonium Nitrate with other commonly used pyrotechnic chimicals can create deadly mixtures. Please don't use it.

It is actually used with urethane in some composite motors but why go to that much trouble when you can make a BP rocket? Also not a good thing to have in the workshop if the police turn up, its used in some high explosives, so just using it on your plants would be best!

If you happen to have some urethane then look on the PFP database under the rockets heading for a formula.

[BigG]

It is actually used with urethane in some composite motors but why go to that much trouble when you can make a BP rocket? Also not a good thing to have in the workshop if the police turn up, its used in some high explosives, so just using it on your plants would be best!

If you happen to have some urethane then look on the PFP database under the rockets heading for a formula.

I stand corrected. It seem like in rocketry it is being used for the creation of both solid and composite motors. I wonder how they solve the hygroscopic issue there. Oh well, better go and do some reading

[Richard H]

I believe that some amateurs, particularly those in North America, construct rocket motors based on HTPB rubber as a fuel/binder and Ammonium Nitrate as the oxidant together with other additives to modify the burn rate like Magnesium powder. I would assume in this case that the HTPB overcomes the hygroscopicity issues associated with AN based propellants.

[.:HAMMER:.]

ammonium perchlorate (NH4CLO4) works a whole lot better with binders than ammonium nitrate. it is not hygroscopic either.

[ActionTekJackson]

Actually for the ameture rocketeer AN is widely used as the main oxidizer for comosite propellants. Google is your friend on this McDee. Here's a little reading to get you started http://www.freepaten...om/4158583.html Good luck mate.

[McDee]

Now it's not a problem to get both KNO3 and NH4NO3 in special workshops or a horticulture. I'm just trying to make a high effective stable and cheap KNO3 + NH4NO3 rocket engine, but I do not know if it is better to use organic or inorganic reduction material. I don't like to use sulfur because of it's negative effect on the environment. I try to do it cheaper and it seemed to me a good idea to use a sugar...

[Andrew]

To get over the hygroscopic effects, the AN is usually made up into some form of plastic bonded composition. Waxes as a coating and or fuel have also been used.

There is some space heritage of AN as well. Some kick motors used it. But in space there is no need to worry about water getting in, you have to worry about it and other plastic bond agents getting out! (technical term "out-gassing").

Edited by Andrew, 17 August 2007 - 09:09 AM.

[GZ22]

Wax also sensitises AN - reading and research is definitely a must in this game McDee!

[icarus]

bp rockets are great but you cant beat a pre made grain nicely cast and ready to drop into your case with no hammering or pressing i think its better for consistent results _ most ammonium nitrate formulas call for 85% to 90% its really cheap just a dam nuisance the implications of ownership my answer is to only acquire 1kg dry it at 80c in the oven then straight into a mixing bowl in the kitchen with urethane binder a quick stir in wifies mixer with dough hooks on then run down to the w/shop to cast it before she catches me.Its kinder to her than using her new thermostatic controlled chip pan (i bought her as a present) to melt sugar to make kno3/ sugar fuel grains , if you begrudge launching shells with bp save a bit of ammonium nitrate to make ammonpulver its smokeless but horribly hygroscopic inormally make about 20 g at the end of the day it goes into a bucket of water and out onto the garden-its not worth keeping

[pyrotrev]

You might find this link useful http://tech.groups.y...O3-Propellants/