Naminosuke Kubota ABSTRACT: A number of parameters are needed to design a rocket motor to satisfy the specified flight trajectory of its payload. The major components of a rocket motor are propellant grain, motor case and its insulation, nozzle, and igniter. One of the key parameters is the burn rate characteristic of the propellant grain …
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Author:Avril
Sparking Compositions for Garden Fireworks
A. V. Belyakov, A. I. Khatsrinov, G. S. Baturova, L. A. Kiprova, E. N. Panferova ABSTRACT: As a result of studies performed, the burn rate and characteristics of the special effect of sparking compositions are established. A method of determining the spark characteristics by photographic method is tested. The results from improvement in the formulation …
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Maximizing the Number of Electric Matches That Can Be Fired in a Single Circuit
Michael A. Tockstein ABSTRACT: For a given electric match resistance and wire gauge, the number of electric matches that one can fire in a single circuit, using a standard DC firing system, depends on the arrangement in which the electric matches are wired (series, parallel or series-parallel). The number of electric matches fired from a …
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Strobe Chemistry
Clive Jennings-White ABSTRACT: Pyrotechnic strobe compositions burn in an oscillatory manner such that there is a marked variation of emitted light intensity as a function of time. The most common theoretical explanation for the phenomenon is that such compositions contain within them sub-compositions that may be regarded as a smoulder composition and a flash composition. …
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Simple Core Design for Neutral Burn Composite Rocket Motors
S. K. Anderson ABSTRACT: Two simple techniques for improving small amateur-type rocket motors are discussed. The first uses a simple, post-cure technique to produce neutral thrust profiles using a simple machinist’s tap. The second uses a small Black Powder pellet to improve reliability and ignition of composite rocket motors. Keywords: rocket motor, composite propellant, thrust …
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Review of: Firework Art – Mark Flemming
Firework Art Mark Flemming Reviewed by Tom Smith, CarnDu Ltd, UK This is a very nostalgic book, giving examples of firework labels, posters and point of sale material over the period of my childhood as well as before. The labels are exceptionally well reproduced, my only critisism would be that additional information, including the approximate …
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An Introduction to the European CHAF Project
D. Chapman Abstract: The CHAF* project was instigated following a series of accidents in large-scale storage of fireworks, by far the most serious being that at Enschede in the Netherlands. The project aims to quantify and suggest means to control the hazards associated with large-scale fi reworks storage by small-, medium- and large-scale investigations on …
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Notes on chlorinated rubber and some other chlorine donors
Barry T. Sturman Abstract: A brief review is given of the history and technology of chlorinated rubber. The empirical formula is approximately (C10H11Cl7)n, corresponding to 65.4% Cl. The structure is complex, and includes partially chlorinated cyclohexane rings. All the Cl is released as HCl on pyrolysis. The enthalpy of formation was estimated from the reported …
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Pressure in a Mortar and Estimation of Muzzle Velocity of Expelled Stars
Dayu Ding, Morimasa Higaki, Yuzo Ooki, and Tadao Yoshida* Abstract: Firing firework star experiments have been carried out using 20 mm and 25 mm inner diameter steel mortars equipped with two or four pressure transducers, and the pressure profi les were recorded. The relative pressure profiles of the four positions in the mortar changed with …
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A Thrust and Impulse Study of Guanidinium Azo-Tetrazolate as a Fuel Additive for Hybrid Rocket Motor
Ann Wright, Warfield Teague M. Keith Hudson, Andrew Wright, Patrick Foley Abstract: Guanidinium azo-tetrazolate (GAT) is an organic salt with a high percentage of nitrogen. GAT was mixed with the standard hybrid rocket fuel, hydroxyl-terminated polybutadiene (HTPB), in concentrations of 15% and 25% by mass. The fuel grains with the GAT additive were fired for …
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