val77 Posted January 8, 2013 Posted January 8, 2013 I will be to test this method, it was a total success! It consists of drilling a core of 50% of the length of the grain of black powder a sktech for ilustrate this http://i15.servimg.com/u/f15/16/97/86/45/semi_c10.jpg video tomorrow
Col Posted January 9, 2013 Posted January 9, 2013 That configuration does a good job as a wheel driver too,
psyco_1322 Posted January 9, 2013 Posted January 9, 2013 Basically what you made was a core burner with an extra long delay section.
dan999ification Posted January 9, 2013 Posted January 9, 2013 what size is the core dia and length, im sure this will have less power than a fully cored 60/30/10 rocket, unless the short core is narrower to make up for it. Someone in the uk ( ed ) uses 3 hour milled bp with this construction, the motors are 4 inches long and cored to 45mm, basically an endburner with a bit of a core, they are quite pokey and can lift a fair amount, im guessing over 150g. Im toying with this idea myself it has advantages that suit me.Less charcoal, easier ramming, less fuel, less tubes, will lift a 3 inch streamer shell. Dan.
val77 Posted January 9, 2013 Author Posted January 9, 2013 yes, the noozle on this rocket is 3mm (for 12mm id tube)
val77 Posted January 9, 2013 Author Posted January 9, 2013 yes, but in france is not easy to found visco fuse....
Excal Posted January 10, 2013 Posted January 10, 2013 Gives me the heebie jeebies walking back up to those once lit fuses,,,don't like that at all especially on a test shot. I give it plenty of time before I walk back. I usually have a trash can lid for a shield when I do.
GalFisk Posted January 11, 2013 Posted January 11, 2013 yes, but in france is not easy to found visco fuse....Check with the Polish suppliers Keten(.com.pl) or PyroGarage(.pl), they should both ship to France.
Potassiumchlorate Posted January 11, 2013 Posted January 11, 2013 It might be wise to have 60:30:10 BP around the core and a bit above it and then 75:15:10. I once made a "hybride" end/coreburner with a stinger spindle and 75:15:10. Needless to say it went CATO
val77 Posted January 11, 2013 Author Posted January 11, 2013 for the no cored fuel, use 60/30/10 ballmilled 1 hour 30 minutes
Mumbles Posted January 11, 2013 Posted January 11, 2013 For no core (end burners), you can use your hottest BP right out of the mill and it wont CATO if made correctly.
val77 Posted January 11, 2013 Author Posted January 11, 2013 yes, for a strong grain add mineral oil on your bp
Mumbles Posted January 11, 2013 Posted January 11, 2013 Mineral oil is totally unnecessary, and will slow down your BP.
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