An animation illustrating principle of operation of the bistage accelerator is added to EM-4 coilgun page.

The scheme of accelerating part and power modules of EM-4 is finished. Corresponding section is added to EM-4 page.

New Investigation of stability of multistage coilgun accelerator with and without feedback to variation of the initial parameters is added to Theoretical section.

New page describing Influence of the magnetic core on efficiency of the gauss gun is added to FEMM calulations section.

Modelling for EM-4 coilgun is finished. Generalized results are here.

It looks not bad yet. I may hope to get more than 70 m/s (230 fps) on the output of the accelerator.

Waiting for the experimental results.

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New FEMM calculations section is started. It will be filled with results of modelling for different configurations of coilguns and according scripts.

Charging-control unit of EM-4 gauss-gun has been finished and tested. Video of the test charging 1500 mkF to 400 V is prepared. More details are here.

FAQ section has been added.

New page of EM-4 coilgun project is open, describing creation of coilgun of innovative ("bistage") design.

Another paper called "Investigation of conditions of aerodynamic stabilization of arrow" has been added to theoretical section.