Rapid Fire Coilgun

Jan  20  2005:  Rapid Fire

Hands down, capacitor driven coilguns possess greater amounts of discharge energy per volume than that of battery.  Even though batteries contain a far more amount of potential density than a capacitor, battery driven coilguns do not deliver the necessary huge amounts of pulse energy.  One reason is their low voltage.  Try drawing 200amps from a 1.5v cell or a 12v module.  This is possible if the cell is very large or the accelerator coil ohms is 0.05 via thick 8 AWG wire.  Still from an average coil of 0.5 ohms a 1.5v cell delivers only 3 A and a 12v module only 24 A.  Another reason battery driven systems do not meet the necessary pulse energy is because their max current discharge per cell is low, dictated by internal resistance.  As the discharge current increases, the battery will compensate by lowering its voltage.

Where the difference between capacitor and battery sources balance out is in a battery's great ability to rapidly recover after each pulse.  This rapid recovery gives birth to rapid firing coilguns.  To overcome the two causes of low pulse power, I will increase the battery voltage and use high cranking amps cells.  Rechargable Lead Acid, 12v, 200-300 cranking amperes will do.  Lucky I, the price for these Lawn & Garden batteries cost the same as the much less capable 12v 7AHr RC hobby batteries with which I began using.  Now that the pulse current is satisfied, the battery voltage is last to solve.  I will series 4 of them to reach 50v to start.

04, Sept 2004:  Onto "portifying" the ACG 760
   Fabrication of the rifle continues.  In this order this is how I plan the construction:
1.    -  Glue together the Coil/Barrel as free form rod.  The barrel is removable while coils remain rigid.
2.    -  Solder leads to the Capacitor banks.              
3.    -  Bond Coil banks to Capacitor banks.              
4.    -  Design PCB schematics Num 1, Num 2, Num 3,and Num 4, PCB layouts 1 animated and 2 animated, etch PCB, 
             and install the components.
5.  -  Connect Capacitors and Coils to PCB, and run test shots, tweak, test and tweak, then test some more.

6.  WIP   -   Install magazine load and battery load.
7.  Form the rifle body and paint the body.