Color, An Introduction to Practice and Principles – Rolf G Kuehni Reviewed by K. L. Kosanke Rolf G. Kuehni’s book Color, an Introduction to Practice and Principles (published by Wiley-Interscience) is for the most part a delightful little book (199 pages in 12 chapters, approximately 6 by 9 inches, price $89.95) on the subject of …
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Category:JPyro – Articles
The main category – things that are published in the Journal
Principles of Solid Rocket Motor Design
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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Review of: The Chemistry of Explosives – Jacqueline Akhavan
The Chemistry of Explosives – Jacqueline Akhavan Reviewed by F. J. Feher Authors of introductory-level books in technical fields face a formidable challenge: they must strike an appropriate compromise between the needs of relatively uninformed students and the expectations of experts in the field. For subject matter as broad and complex as chemistry or explosives, …
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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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Note on “Metal Monochloride Emitters in Pyrotechnic Flames – Ions or Neutrals?”
Barry Sturman As pointed out in the subject paper several writers have erroneously attributed the molecular band spectra that produce the characteristic colours of flames containing various metals M, (M = Ca, Sr, Ba or Cu) and Cl to the singlycharged ions MCl+. Ref: JPyro, Issue 21, 2005, pp71-72 (J21_71)
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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Spectral Study of Metallic Molecular Bands in Hybrid Rocket Plumes
K. L. Maxwell and M. K. Hudson ABSTRACT: A labscale hybrid rocket was used to study spectral bands produced by metal combustion. Bands in the ultraviolet-visible region (300–750 nm) are of interest. The rubber-like fuel, hydroxyl-terminated polybutadiene (HTPB), was doped with a metallic salt for introduction into the plume during combustion. When introduced, the metals …
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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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Impact Sensitiveness Analysis of Pyrotechnic Flash Compositions
S. P. Sivapirakasam, M. Surianarayanan, P. Nagaraj,1 G. S. Venkataratnam ABSTRACT: Impact sensitiveness of pyrotechnic flash compositions consisting of mixtures of potassium nitrate (KNO3), sulphur (S) and aluminium (Al) is experimentally analyzed using equipment similar to BAM (fall hammer) equipment. Results indicate that an increase in the sulphur content of the mixture raises its sensitivity …
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Choked Flow, a Frequently Misunderstood Term
Lawrence Weinman ABSTRACT: A brief description of compressible fluid flow is presented to clarify and, hopefully, reduce the incorrect usage of the term “choked flow” in the fireworks community. Keywords: choked flow, fluid flow, gas velocity, mass flow, rocket, sonic flow Ref: JPyro, Issue 21, 2005, pp31-38 (J21_31)