fred815 Posted May 12, 2012 Posted May 12, 2012 Been having some of my 3lb stingers cato or take off violently with NO spin up before launching. Using a granulated 60-30-10 fuel. With my homemade black willow charcoal and ball milled maybe ten hours or more. Could this be too hot. ???? I just don't see that fuse hole spin the sucker up?? Using a drill jig specifically made for this tooling (machined lines for swapping etc). So I shouldn't have to be adjusting nozzel thickness or fuse hole heights which kinda defeats the purpose of dropping the big bucks on expensive tooling?????????
Potassiumchlorate Posted May 12, 2012 Posted May 12, 2012 Normally you can actually use standard 75:15:10, but it should be meal, not granulated, at least that's what I have used for stingers.
dagabu Posted May 12, 2012 Posted May 12, 2012 We use standard Benzoate whistle in stingers without CATO so i doubt the fuel is at fault. We use NEPT tubes, what are you using? -dag
pyrokid Posted May 12, 2012 Posted May 12, 2012 I've had rockets blow up on me, and I think it was the fuel that was at fault. Even when granulated with no binder, it has some pretty resilient little pieces that I think create faults in the fuel grain of the rocket.
pyrokid Posted May 14, 2012 Posted May 14, 2012 Hobby horse nept ???? Yes. It was a 75-15-10 mix, nozzleless. I ommitted the oil, so that may have had something to do with it. My 6-3-1 mix compacts very nicely, so I think it is the extra KNO3 that is responsible for the tougher granules.
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