who's doing what at the moment
#1
Posted 02 April 2003 - 06:23 PM
#2
Posted 02 April 2003 - 11:36 PM
-Matt
#3
Posted 03 April 2003 - 07:48 AM
Making sure I perfect these before any more launches!
Currently though, I'm trying to make some really good colour compositions. So far I've got a pinkish red and a weak green.
I know it's basic stuff but I'm making a traffic light!
Also looking into perfecting my Roman candles - need to apply some 'oommph' to the stars' colour though - so far I have a sort of orange ball with occasional white sparks. I do get quite good heights though.
#4
Posted 03 April 2003 - 08:29 AM
#5
Posted 03 April 2003 - 11:29 AM
I too use BP for the engine and now understand why one of my first attempts exploded - the nozzle was too small and the BP was very fast Willow BP. I'm now using a different ratio for the BP which I find gives a reliable lift -> 65:20:15. I also add a 'smidgen' of icing sugar.
I haven't tried any payloads yet as I'm not 100% confident with my rockets but it is an aim.
I use a nail and dowel to create the centre part of the rocket. This works but I can imagine that Robert's comment on the right tools would make the manufacture easier.
To change the subject, any advice with colours? I use Ba2CO3 and Sr2CO3 with BP in varying 'bucket chemistry' ratios and don't have a ready access to ClO4's.
Thanks
#6
Posted 03 April 2003 - 05:04 PM
#7
Posted 03 April 2003 - 07:10 PM
Certainly with most colours and colouring agents you need a Chlorine donor for the colurs .A good example of this is a Barium Nitrate Formula that gives a good white but soon as a chlorine supply such as Parlon or Pvc is used you end up with a very good green.
I personally use magnesium in my red's Greens and White's although it is expensive for the correct grade it creates a absolutly splendid colour.
As far as Potassium Perchlorate goes all my formula's use Potassium Chlorate as this is easier to buy than the other.
#8
Posted 03 April 2003 - 09:16 PM
Potassium chlorate 70%
Strontium carbonate 15%
Red gum 10%
Dextrin 4%
Charcoal 1%
bind with 75% water 25% alchole
the above can be used as a pumped star or even better as a round star ever way this will require a 1mm prime of H3.
Red mag
Strontium nitrate 55%
PVC 7%
Parlon 10%
Magnesium 100 - 200 mesh 28%
These mag stars need to use a stepped prime ie roll stars to 8mm then take 75% mag mix 25% bp and roll to 8.5mm then 50% mag mix 50% bp roll to 9mm then 25% mag mix 75% bp roll to 9.5mm and finaly 100% bp to 10mm.
Bare in mind once you get the strontium carbonate star working it is worth pursuing the mag star as this gives a really bright red in the sky.
#9
Posted 04 April 2003 - 09:21 PM
Lets get in contact so we talk more.
#10
Posted 05 April 2003 - 05:19 PM
#11
Posted 05 April 2003 - 07:01 PM
will contact you later on.
#12
Posted 09 April 2003 - 06:09 PM
#13
Posted 09 April 2003 - 09:17 PM
#14
Posted 10 April 2003 - 08:06 AM
These rockets work incredabily well but their success did not come overnight.along with every thing else I do it has taken a long long time to perfect and make them safely and reliabily.
I have found that my best fuel is very carefully refined with special attention to the types of charcoal that are used.
#15
Posted 10 April 2003 - 06:36 PM
Managed to get the lampblack off your hands yet? or every thing else it came in to contact with.
Do you use a dryer for your comps and stars? It makes life much easier I can hold 10 large trays in my drier which is fantastic in winter and it only costs about 5p an hour to run with an average temperature inside depending on the internal humidity of 30 degrees. It also means none of the mixes are any where near my house.
Cheers dears
Rob
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