thanks paul! i learn just a little bit more every day

back to the capacitor topic, i was thinking about it again, and the rms current rating on the capacitor is just the ripple current. and i haven't actually tested this on something this big yet, but it seems that the capacitor just kind of has to fill in the corners of the pulse, to make it a nice square pulse, and the batteries are still doing most of the actual current. i'm not sure how it relates in terms of percentages, but i would bet that the ripple current on the capacitor is probably less than 20% or so of motor current. just how i'm picturing it in my head...

*EDIT*

to put this capacitor in perspective, we can compare it with the existing capacitor bank in the cougar 1k. 22 electrolytics in parallel:

2.84 amps ripple current each

149 mOhm ESR each

in parallel with ten poly caps,

7.5 mOhm ESR each=.75 mOhm total

this gives

62.48 amps ripple for the whole stack

~.74 mOhm total ESR

compare this with the ring cap:

500 amps ripple

.125 mOhm ESR

new capacitor should be more than up to the job