I have designed a rocket launcher and I need to spec a rechargeable battery pack for it. I know very little about batteries. I have the following data from field tests of the launcher using a FlashFish E300 portable battery pack. The launcher ramps up the current to the igniter in ~300 msec steps from zero to ~4 A. Basically, the launcher heats up the igniter until it ignites, which then ignites the rocket motor. I found that ramping up the current uses less current for a shorter amount of time than just dumping 4 A into the igniter at once. The quiescent current for the circuit is ~100 mA because the FlashFish needs this much current to keep it from automatically turning off.
Data from a typical launch:
If I need enough power for 40 launches in an 8 hour day before recharging the battery, what battery technology do I need and how should I spec the battery? I need the batteries to fit into a 6" x 8" x 1-2" enclosure. I am also interested in learning how you thought about this battery design.
Data from a typical launch:
Duration (sec) | Current (mA) | Voltage |
0.314 | 96.68 | 15.337 |
0.312 | 306.152 | 15.198 |
0.312 | 883.008 | 14.996 |
0.312 | 1185.938 | 14.844 |
0.312 | 696.094 | 14.722 |
0.312 | 1401.855 | 14.601 |
0.312 | 2107.617 | 14.476 |
0.312 | 1421.191 | 14.359 |
0.313 | 2313.867 | 14.237 |
0.312 | 1359.961 | 14.116 |
0.312 | 3667.383 | 13.999 |
If I need enough power for 40 launches in an 8 hour day before recharging the battery, what battery technology do I need and how should I spec the battery? I need the batteries to fit into a 6" x 8" x 1-2" enclosure. I am also interested in learning how you thought about this battery design.
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