5 replies to this topic

[ActionTekJackson]

Alrighty, well unfortunately I can't actually post much info about composite motors. I am still in the trial stage of these types. I've been making and testing various silicone2/perchlorate based composite propellants and plan to (hopefully) launch two different types today. I am really curious if anyone has any information on Urethane bound composite propellants. I've been attempting to get a working Ammonium Nitrate/Urethane composite, but have had no real luck so far using an 85:15 ratio, I currently have a drying cast of 90:10. Has anyone had experience with this, or know what the proper stoicheometric ratio would be for NH4NO3, or perhaps KClO4?

-of course as the subject dictates all discussion about any composite propellant is welcome

Edited by ActionTekJackson, 27 September 2006 - 09:07 PM.

[BlackSky]

Actually I tried Urethane prop. once , but without any success.
Check Nakka site. You will find more info. :

For Solid Propellants:
http://members.aol.c...akk/propel.html

For main page of Nakka site :
http://www.nakka-rocketry.net

Hope this will help.

Regards
BS

[ActionTekJackson]

Actually I tried Urethane prop. once , but without any success.
Check Nakka site. You will find more info. :

For Solid Propellants:
http://members.aol.c...akk/propel.html

For main page of Nakka site :
http://www.nakka-rocketry.net

Hope this will help.

Regards
BS

This is actually where I learned about it. I too have had no success with NH4NO3/PU propellant, however, thanks to my friend "BigBang" I now have a ratio for a KClO4/PU comp that seems very promising. I have two propellant grains of this curing now, so I'll let you know if it works :-)

on a side note, anyone have any experience with Silicone II based propellants? I've used the following composition: "Blue strobe rocket propellant
Source: Greg Gallacci <psygreg@u.washington.edu
Comments: The GE silicone II is noted for having an ammonia-like odor, where the GE silicones smell more like vinegar. The dimensions of the rocket made with this propellant were 1 1/8 inch ID, with a 1/2 inch core.
Preparation: Mix the copper oxide, PVC and silicone first, in a plastic bag. Then mix in the ammonium perchlorate. The stuff is said to be somewhat crumbly, and presses well.

Ammonium perchlorate..............................63
Silicone II.......................................22
Copper(II)oxide...................................10
PVC...............................................5"

However, to no avail, this composition produces an immense amount of solid ash*or something* which tends to clog the nozzle resulting in 1. a slow, uneven burn. 2. The nozzle builds up pressure and blows.

[BlackSky]

so I'll let you know if it works :-)

Thanks

But did you try Epoxy/Nitrate prop. ?
I may try it later but not for the meantime because I'm quite busy these days.

[Creepin_pyro]

However, to no avail, this composition produces an immense amount of solid ash*or something* which tends to clog the nozzle resulting in 1. a slow, uneven burn. 2. The nozzle builds up pressure and blows.

I've made that comp many times for use in stars and some experimental go-getters, and it was always very clean burning - never produced any slag whatsoever. I think your slag issues are most likely due to the kind of Silicone sealant used. What kind are you using specifically?

I'm also pretty sure that this comp will not produce any useful level of thrust without a decent core.

[ActionTekJackson]

I've made that comp many times for use in stars and some experimental go-getters, and it was always very clean burning - never produced any slag whatsoever. I think your slag issues are most likely due to the kind of Silicone sealant used. What kind are you using specifically?

I'm also pretty sure that this comp will not produce any useful level of thrust without a decent core.

Hmm.... well, the silicone is the reccomended GE Silicone II, couldn't find any specific GE number that I can remember, I'll have to check again. If it's not the right kind then I will try getting something clearly marked GE5000.