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What's New YY-MM-DD 05-10-03 Updated the Lab Equipment page. 05-01-10 Added a page describing the implementation of a multi-stage induced voltage triggered coilgun. 04-07-18: Modified the first and third 'coilgun basics' pages. Cleaned up the links page a bit. 04-03-27: An experiment looking at the effect of flux path enhancement is added to the experiments page. 04-02-13: Corrected a diagram on the launch position experiments page. 04-02-12: Added a page describing the implementation of an induced voltage trigger, and a page illustrating a method of winding a neat, multilayer coil. Organised the experiments main page into categories. 04-01-04: Added experiments looking at the effect of launch position and a thyristor fired coilgun. Updated the current sensor page with another design. Also added a page concerning the calculation of coil inductance using FEMM. Minor changes made to several other pages. 03-07-17: Added a page with images of the pistol assembly sequence. 03-01-17: Loaded new site design. 02-09-05: Added a page describing the capacitor test firing of the pistol accelerator. 02-08-21: Added details of the final design and construction of the boost converter. 02-05-30: Added a page to the maths section which shows how the energy storage of an inductor circuit varies as a function of time. Added another link. 02-04-07: Added a boost converter circuit diagram to the Voltage Converter design page. 02-03-30: Added some material to the pistol design pages... It's getting there, slowly. 01-11-03: Added a theory section on electromechanical energy conversion which develops a mathematical model of the dynamic behaviour of a simplified linear motor. Added a rendering of the current pistol design iteration. 01-07-29: Changed the first Optimised Coil Parameters page to illustrate the effect of coil outer radius on the central field strength. Included a small experimental analysis to show the correlation between central field strength and projectile energy. Added a link to Afuriel's coilgun page. 01-07-03: Added results of the following experiments - Optical triggering experiments. Diode commutation experiments. Transient suppression experiment. Added pages covering the initial design and construction of a 3-stage electromagnetic pistol. Converted tabulated results into scientific notation format. Also corrected a really dumb efficiency calculation error in the open loop results. Added a small analysis of the dynamic internal resistance of the battery source. Added some links to new coilgun sites. 01-02-28: Corrected more typo's. Added some more images of the 16 Stage Opto Prototype showing the current state of development. Constructed a new current sensor which uses a smaller length of wire and so is less inductive. Added link to a list of the resistivities of various metals. 01-02-08: Amended some statements and added a note to the coil construction issues page (1) concerning force maps vs stress maps. Fixed a picture link on that page. 01-02-05: Amended some of the results data - I was using an erroneous mass value for one of the projectiles so the kinetic energy data was off. The difference was small but I may as well try and be accurate :). Added some info about drag to the projectile design page. Added a link to a new site. 01-02-03: Fixed some broken links and more typo's. 01-02-01: Corrected some typo's and added images of the 9-stage induced voltage coilgun accelerator. 01-01-30: Coilgun Systems goes live. Added hit counter.
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