MADPHIL none required lol

Guys Diesel and PHmax you are both right and both wrong.

Von Ohain has the best description here. The caps in a BRUSHLESS speed control are to protect the speed control thats it for us normal guys. The real engineers can play with caps some to tailor the effects to thier desire but nothing for the performance of gaining more speed of your setup.

Diesel Dont let all the car mags and car audio installers fool you with the capps help your system for max output. (they can have benifets but most of the time for short bursts) Example:
you have a 1000 watt system and your car lights dim under heavy constant bass. you go out and buy a 10-200 farad cap system thinking it will improve things. think of a cap as a storage battery. they fill quick and disharge quick also. you car audio power supply system ( alternator and battery set up) only puts out so much power.

Now while at low power settings those 200 farad caps will be charged and have a large quick power burst waiting for you. your favorite song comes up and you turn all the way up. for about 2-3 seconds you will have a high output power untill the caps are drained. now your audio power system ( that wasnt up to the task earlier) now has to supply power to the car amps and is also trying to fill the caps back up. This would work great while watching a movie in your car as the caps would have time to recharge, but under constant bass there is no point in it. you also add more wires and conncetions by hooking up these caps. Now this is with AMPS that are unregulated. most amps are regulated in that they give the same output power no matter what the voltage input is. Some competiton amps are unregulated so that you can run 16-18 volts input and have a high output (cheater amps) as most amps are rated at 13.8 volts

Also a lot of you guys may not have been in the hobby long enough to know about BRUSHED motors (non brushless ie with only a positve and negative motor wire) the BRUSHED motors had two very small caps mounted on the end bell of the motor. one to negative and the case of the motor and the other to the positive side and then to the case. These were installed for INTERFERENCE on 27,50,72 MZhz systems in the days of old. The BRUSHED motors would have high em because of the "sparks" coming of the brushes and the comunicator of the motor.