New Tooling

[Cosmikdebris]

50cal

 

What size do you recommend for someone just starting out?

 

Is the 4oz, the amount of propellant?

 

That's a nice clean looking rocket.

[50caliber]

You could try making some bottle rockets(1/4" ID x 2" long x 1/16" Wall) but theres no point buying tooling unless you can make it, bottle rockets are fairly simple and almost impossible to get wrong in my opinion. You could try 4 ounce rockets, they are just a scaled up version of the bottle rockets.

 

I fired the rocket last night, It launched fine but not as fast as I wanted mainly because the payload was filled with zinc spreaders.

[styropyro]

And to answer Cosmikdebris's rocket size question, 4 ounce isn't the weight of the rocket. Here is a table I copied from the "Pyrotechnic Workshop Reference" Thread:

 

Name ID Stick* payload*

 

2 oz 3/8"

4 oz 1/2"

8 oz 5/8" 30" 120g

1 lb 3/4" 36" 180g

2 lb 7/8"

3 lb 1" 48" 500g

4 lb 1 1/4"

6 lb 1 1/2"

* stick length and payload weight general suggestions

 

Also:

Conventional drag stabilised core-burners usually have a case 10 IDs

long, but stingers must use shorter cases for stability, typically 4 IDs

long. OD is 1.25 to 1.5 IDs

 

Hope this helps!

[Mumbles]

The weight thing comes from the old days. It is the mass of lead balls exactly the ID of the tube that will fill the tube, which is 10 balls. So in a 4oz rocket. It is 1/2" ID and 5" long. So 10 1/2" lead balls will weight roughly 114 grams. Calculating it out give 121g, which is reasonably close. I am sure the balls used were not exactly the perfect ID.

[Cosmikdebris]

50 cal, Styropyro and Mumbles

 

Thank you for your help and advice, I have been reading various articles about rockets, they now make a little more sense.

 

I don’t want to be viewed as a leach; I will try to contribute with my next post.

 

Mumbles, the steel ball gauge thing is something I wound’nt have guessed in a hundred years!