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HI all! I have another question for you! Reading AFN book I read some different contrasting things about rockets. On AFN II it is said that the nozzle is 1/4''(~ 1/3 I.D) with 5.5'' spindle lenght for 1 pound rocket. On AFN III it is said that the nozzle is 45-50%(~1/2 I.D) of tube for a generic rocket, which spindle lenght is 78% of motor. On website posted by sjeef1 it is said that nozzle is 1/3 I.D. Using http://www.flashnet.dk/rts/ the nozzle is 50% I.D.. So can someone tell me to make ''perfect'' rocket what is the best tooling design ? Using larger nozzle I should use hotter fuel right? or to reach highest height is better smaller nozzle with colder fuel or bigger nozzle with hotter fuel? Is reliable using(http://www.flashnet.dk/rts/) software? thanks to all. My tooling have this design:
I.D 2cm
spindle lenght 15,4 cm
spindle width 1cm

thx! It's a good website! As soon as I have some spare time, I'll try to make another 1LB motor! :)

thanks guy! I have another question.. Do you can see the images and the other pages of this site?
There are many parametres to make 1LB nozzless BP rocket: http://www.angelfire...kets/index.html

I belive the problem is the ignition because I made an electrical igniter using NC laquer with 75% BP. I tested it and it made a little BOOM, so i suppose it was too poweerfull. Is it possible? The diameter of the spindle is 1cm. I rammed the motor with increments of one teaspoon

Hi guys! I had machined 1LB BP rocket tooling using ''pdfbq'' link. 2cm ID, spindle lenght 14cm. I've tested it using hotter 75 15 10 granulated BP without nozzle, ignited at the top of the core but the rocket CATO. Is the spindle too long? or is the BP too hot?
For UT tooling is too expensive to buy for me.This is the reason I have investigated for dimension.

I asked this question hoping someone have bought this tooling :)

Yes I know, but I need to pay for log in in passfire :)

HI! Do you know steve laduke's universal rocket tooling? I have searched the dimension on the internet without any results! Do someone know the dimensions of 1LB rocket tooling?thx to all!!

thx! E.C. I will try and I will post the results!

so you are talling to me that a composition based on nitrate and MgAl is not sufficent to light the stars?

Thanks to all but I haven't perchlorate and silicon. the forumula that i've used is:

Hardt Green Star #5
Barium nitrate 56
Red gum 7
Magnalium -200 mesh 17
PVC 15
Dextrin 5
with 25% alcohol / 75% water
but is safe to ballmill BP with MgAl together?

thx!! I just tested my green MgAl stars..They are very very beautifull! The green is intensive but the only problem is to light the stars.. I tried to prime with BP without results(is too cold).. what kind of prime must I use? I don't want to use chlorate or perchlorate. A simple prime formula if is possible..

yes I have a respirator! So Can I grind it in a ball mill? I ask it because I've read that you can grind only KNO3, C,S. But I've also read that you can grind all chemicals separatly without problems.

how can I grind barium nitrate without health problems caused by dust?

I have at home PVC k65. I tried to solve it with acetone, kerosene and turpentine without result :(

If I use MEK to solve PVC??

shit! so, how can I make stars with this composition using PVC like that formula?

Hi explomaan! why I must replace PVC with PARLON? I have very very much pvc powder but any parlon powder ! thanks to all for the reply!!!!

sorry I was wrong... I want to do Hardt Green Star #5 with magnalium but this formula with magnesium :
Lancaster Red
Strontium nitrate 55
Magnesium 28
PVC 17
Must I coat magnesium in this formula?200mesh magnesium is useful for metal stars or it is better to use another mesh size?
thanks

hi all!!! I've read that magnesium must be coated with linseed oil or with potassium dichromate.How can I coat my magnesium with linseed oil? I want to do this stars having this formula

Hardt Green Star #5
Barium nitrate 56
Red gum 7
Magnalium -200 mesh 17
PVC 15
Dextrin 5
Can I use magnesium without coating because there is PVC?

On pyroguide stays 3*3/pi and not 3^3/pi

ooo stupid error.... I have another question.. the last one what is the external diametr. for a 4'' and 3'' shell bought without any pasting?

Never heard of Wikipedia?

o yes I suppose was that but if I do 3^3 /3.14 is 8.59 not 2.86 as on pyroGuide result or not?

okkk!! I saw on pyroGuide how to make 3'' shell but i don't undestand the formula y=x+3/pi ( what is pi?) and why he use 3 strip pasting metod that correspond to multiply for 2 the layers to find effective layers? can you explain me this? ....another answer.... sorry can I replace red gum with shellac in colored composition without problem?






link:
http://www.pyroguide.com/index.php?title=C...hell_%283%22%29


this is the text from pyroguide:
This shell needed 10 layers of pasting (=20 effective layers) to complete. The diameter of the finished shell should be y=x*3/pi, where y is the diameter of the finished shell and x is the size of the mortar. So for this shell it should be 3*3/pi=2,86". Making it this diameter might take a lot of time for beginners, however it is not as problematic with small shells like this one. Making shells like the size of 6" or bigger will take a lot more of work. After the layers of pasting, let the shell dry completely.

ok thx a lot !!! I will assemble and test one shell!!!

thx! Because I read on pyroGuide that for the 3'' shell are required 13 layers( posted charts)
Mortar size (inches): Actual Shell Size (inches): Paper weight: Number of wraps: Size of paper strips:

3" 2-5/8" 30-40lb 13 3/4" wide x 4" long
4" 3-3/4" 50-70lb 9 1" wide x 5-1/2" long
5" 4-5/8" 60-70lb 10 1" wide x 7" long
6" 5-9/16" 60-70lb 12 1.5" wide x 8-1/2" long
8" 7-1/2" 70lb 14 1.5" wide x 11-1/2" long

What do you think about it? is correct?
For the size of mortar i don't know because i used 8.5cm inside diam. with 1 layers but the break is ugly and asymmetric.. I have supposed 9 cm internal diam..
What metod is the best to use for pasting?