failure of a rocket !

[irazboubi]

Hello,

 

I just realized a rocket with the same method as in the following video (the plastic tube is replaced by a cardboard tube 5mm).

 

Link to download my video:

 

http://rapidshare.com/files/261419832/ROCKET.00.avi.html

 

Method Used:

http://www.youtube.com/watch?v=O8kG2g8BMJs...re=channel_page

 

 

The KNO3-sugar mixture (50 KNO3/25 sugar) have been reduced to very fine powder, but the proportions were not met precisely (without scales and with a spoon)

 

I'm having a few days in an electronic scale.

 

-Can you tell me where is the problem of my rocket?

 

-The problem is there the weight of the rocket or the accuracy of the mixture ?

Thanks

[TheSidewinder]

It could be that the nozzle diameter was too large, the comp wasn't mixed well enough, or that your proportions were wrong.

 

But without knowing more than what I could see from that video, it's hard to say. Other members may have some ideas.

[TYRONEEZEKIEL]

KNSU rockets arent the easiest thing to do. your ratios play a part. but I'd have to say the nozzle size was not correct. Did you core the rocket?

[PyroMan16]

The proportions should either be 65/35(Kn03/sugar) or 20/11(KNo3/sugar). Both KN03 and sugar should be ball milled or grinded very fine in a coffee grinder. Then pack it down as hard as you can in a 3/4in.(width)PVC pipe and make the nozzel around 5mm.

[andyboy]

Even better than ballmilling both the sugar and nitrate would be melting the sugar with a little water, then adding the ballmilled nitrate and letting it melt together since that will make the most intimate mix, add a little red iron oxide as a catalyst aswell. Core the rocket and put a dash of BP into the core so it will ignite the core all at once. You can get away with rather large nozzle diameters with KNO3/sugar rockets, and I suggest you start with larger nozzles and making them smaller if they don't work since they will make a bang if the nozzle is to small.

 

 

 

Anyway, the vid suggests a few problems, the ignition wasn't fast enough, the mix wasn't hot enough and the guide-stick was to short.

[derekroolz]

It seemed to me that the rocket wasn't even balance right, remember to use a square doweling not round and the longer the stick the better.