By Jack Drewes, Dorothy Drewes
This booklet comprises descriptions and images of firewoks. the data contained herein is predicated at the authors' studies utilizing particular instruments and elements below particular condtions no longer inevitably defined within the articles. No warranties are made, given or implied. Readers are counseled that they need to shape their very own opinion as to the appliance of any info contained herein.
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Extra resources for The Best of AFN - III
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Rod and funnel may work well also to fill the tubes. Now I crimp the open end to close the case. The finished tourbillion should be 5/8" long although they can be made up to 7/8" long. Now I take an awl and punch a small hole about 1/8" from the end into the side of the tourbillion. I place a 1/2" long piece of tissue fuse in the hole and put a small piece of masking tape over the hole. Only a small piece of fuse needs to be bare for the tourbillion to light. See Figure 1. The tissue fuse I use is made of model airplane tissue.
I think it is a big help to form it funnel-shaped, approximately 30°, as was stated before, and to make the outside end concave, per fig. 3. This should let the gasses flow out smoothly. Look at the NASA rocket engines. Next, the clay nozzle should be at least the same height at its top outside edge, as the case inside diameter, per fig. 3. d. of the case. I have had no failures since using this method. Using a thin clay plug, or no plug, too often allows a blow-through. THE FUEL Most fuels are potassium nitrate, charcoal, sulfur mixes.
5" long piece of fuse in with a small piece of tape secured to a fin. Next I needed a payload case, but as they are bummers to build, I don't. 5" or so long. I clean the top edge of a rocket motor then glue the cases using hot melt glue. I plug the casing with a paper plug of the proper diameter, or sometimes I buy plastic nose cones (the large ones from Firefox work with a little effort on the 3/4" internal diameter spiral wound tubes). For some payloads, I often include up to 10% pyro flake titanium.