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Also, do not wire the box mag motor in series, it will ruin everything.
In parallel, say the AEG motor draws 16A and the boxmag motor draws 4A. In series, there will be 16A attempting to go through the boxmag motor and every other piece of electronics you have in between the AEG motor and the battery.
Parallel is the only way to go.
If you want to be at 20rps, just use a 7.4 lipo, 18:1 gears, and a tienly 35k rpm motor.
35k rpm on 11.1 lipo, 2/3 motor speed is 23k rpm, divide by gear ratio (18:1) = 1280/60= 21rps
This is assuming the load is optimal for the motor, but at 400fps and on 18:1 for a fairly high torque motor, you should be well within the optimal load.
alternatively, using the formula and my build above, just use a low torque high speed (40k rpm) ferrite magnet motor on double torque 23:1 gears (instead of 26:1 gears) and that should put you right at 1200rpm while efficiently sipping amps.
If your RoF is dropping due to the presence of another motor, it's either a resistance or supply issue. So run a battery that can do at least 30A continuous, but also wire the box mag motor directly to the battery, or subsequently use 14ga wire up to the connection point of the wiring for that motor. Think of it like a road, you've got 3 lanes of traffic one way, then you're taking one lane off to go somewhere else while there's still 2.5 lanes worth of traffic trying to go straight.
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