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Assessment of maximum efficiency of a coilgun in a range of energy added to FEMM calculations section. Single stage system is modelled in variety of parameters including peak switch voltage for the first time. The maximum on efficiency vs energy dependence is observed.

Views: 5 | Added by: Eugen | Date: 22.01.2018 | Comments (0)

Merry Christmas and happy New 2018 Year!

Views: 7 | Added by: Eugen | Date: 01.01.2018 | Comments (0)

Views: 12 | Added by: Eugen | Date: 04.12.2017 | Comments (0)

Views: 15 | Added by: Eugen | Date: 06.11.2017 | Comments (0)

A simple method of assessment of moment of maximum current for overdamped circuits is added to Simple equations for coilgun section.

Views: 20 | Added by: Eugen | Date: 26.07.2017 | Comments (0)

New Simple equations for coilgun section was added. It will collect relations which allow fast assessment of desired parameters of coilgun. 

Views: 27 | Added by: Eugen | Date: 24.06.2017 | Comments (0)

A box for vertical gravitational feed of EM-4 coilgun has been assembled. 

The projectile's heads are milled, too. Their diameter is 5,5 mm, the rear parts are thinner and have 0,15 mm cuts to glue tubular stabilizers later.

 

Views: 36 | Added by: Eugen | Date: 28.05.2017 | Comments (0)

A sketch of EM-4 coilgun is performed with main dimensions. Laser-cut plywood is planned to be used as material of the case. A wooden detail of rather complicated form will be milled to make the bed.

I am intended to mount a collimator scope (like one used in EM-3 coilgun) on top, but didn't choose its type yet, so it is not presented on the sketch.

Views: 40 | Added by: Eugen | Date: 17.04.2017 | Comments (0)

New short video of testing of infrared sensors was added to EM-4 coilgun page. Small nail is falling down through the sequence of accelerating stages activating the SCRs (yellow LEDs are illustrating that process).

Views: 47 | Added by: Eugen | Date: 27.02.2017 | Comments (0)

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