> Hi to you all.
> Some years ago I try my hand at building and launching my own rocket using
> propellant I made myself. Unfortunately the rocket exploded on the launch
> As far as I can remember I used Ammonium perchlorate (that I had to make in
> a lab), Aluminum powder, Iron oxide and polyester as a binder. Is it right
> for me to say that the reason way my rocket exploded like a huge firecracker
> could have been due to the Iron oxide? If I only want to use polyester and
> ammonium perchlorate, what mixture ratio should I use?
> That is the simplest solid rocket propellant that I can make using chemicals
> that a readily available?
Sounds like you didn't test your engine on the ground first. I imagine
you didn't do a few other things any prudent amatuer rocketeer would do
as well. You're lucky that engine blew up on the pad and not in your
There is a sliding scale:
1] Safely and reliably flying rockets with pre-assembled engines (estes,
quest, aerotech single use).
2] Safely and reliably flying rockets with engines you assemble from a
kit (aerotech rms).
3] Safely and reliably flying rockets with engines you make to a
pre-established tested design (thunderflame).
4] Safely and reliably flying rockets with engines you make and design
and test yourself.
If you haven't mastered 1-3, you have no business doing 4. If you've
mastered 1-3, you wouldn't be posting the question.
The chemistry part is simple, almost trivial. You can add any one of a
dozen oxidizers to one of a million fuel bases, with your choice of
accelerants, suppressants, binders and stabilizers. They all work if
you know what you're doing, all of them will get you killed if you
don't. Again, if you have to ask, you shouldn't be doing it.
The techniques and procedures required to safely and reliably
manufacture rocket engines are not simple. You will not be able to
safely and reliably manufacture a rocket engine by downloading a
"recipe" off the internet. Any such "recipe" you can find is a recipe
Your rocket did not cato because the engine had iron oxide in it. It
failed because You didn't know the required techniques and procedures to
make a reliable and safe rocket engine. You ask a trivial chemistry
queation, when there are many non-trivial engineering questions you
I'm not telling you this to rain on your parade or be a joykill. I'm
interested in rocket engine design and manufacture myself, but I haven't
mastered 2] yet, so I'll focus on it . When I've certified level 3 on
RMS and mastered hybrids, I'll move on to 3] Thunderflame!. But that'll
take a while, and I'll need to get some acreage and some insurance, and
some liscencing to do it. You _did_ get insurance before you tried to
launch your homemade rocket, right?