i was just wondeirng, if you were able to charge a cap with an RC battery and keep it onboard an RC car, would u be able to discharge that cap giving the car a very short burst of power/speed, close to a “NOS” like effect? I know that the discharge would have to close to the actual motor voltage so u dn’t blow it up…same with the ESC, but would it be possible? maybe if it was more controlled through a series of resistors?
Just sort of popped into my head today, im just curious ^^
When I was RC racing the circut up and down the east coast I used a "memory " cap. on the line so it would give you a xtra half of a lap on the reciever…
battery dead but still moving car and the radio would not be DOA at the same time so you can still control it…was worth it…
You could certainly discharge at twice the voltage for a short burst. Problem is that it will take alot of your battery power to load up a bank of caps. I guess if you have power to spare, you could remotely charge the caps then release them.
You would need 2 channels to do this. Unless you can hook a linkage up to a servo so that full one way tripped a switch to charge the caps and full the other way tripped a switch to release them.
It basically works like a pulse gun would or a taser. You charge the caps in parallel then release their current in series.
I know people who have done this and it’s worked 
but I prefer just a few model rocket engines, much more impressive
The capacitors you would need would be so big that they would probably slow you down enough to not be worth it.
A lot of people wire a single cap in parallel with the battery. It’s simple, and anecdotal evidence suggests that it works.
I think it would take a lot of time for it to gather enough energy so that when it is released it would make a noticable difference in speed.
here we go guys…found some that might work struggles under weight
tries to lightly place caps on table…SLAMMM
table breaks
sry about the table 
we might need something bigger than an RC truck and normal 7.2 volt battery to carry and charge these…but i bet they give one hell of a kick
We might need to invent a whole new bot just to carry those! 
hey they look like “stiffing” caps for a car amp…
nice…
I think your 7.2v motor will explode when you drop 40v through it
You can use alot small caps.
lol, i know i was just playing with the idea, wiw asn’t reaqlly planning on making the rover with it…i think i already have enough power…just a little thought…
btw, i have a little project that invovles a little track add on, i have to fabricate it this weekend and put it onto the finished rover prototype, but it looks good on paper so i think it will work reasonably well ^^
hint: it invloves attaching something onto the track to give it better traction in outdoor environments
It’s not charged at 40V. Capacitors can be charged to whatever potential you put across it. The 40V is the “WVDC” or the DC Working Voltage, i.e. Breakdown voltage.
Since the voltage across capacitors can sometimes double or even triple the voltage placed on it (due to ringing under inductive loads), it is a good idea to use capacitors with WVDC that are at least twice the operating voltage, preferrably three times the voltage.
The capacity of the capacitor dictates size. However, the WVDC rating also dictates size.
If you can size up your capacitor just right, you can get the most optimal size (such as a super cap which is VERY high capacity but has a low breakdown).
The capacitors placed across the batteries for electric cars are really for bypassing. It is able to source current while there is an instantaneous high demand for current, which causes voltage to bounce, so Voltage-wise, a capacitor is filtering. But compared to a battery, the charge stored in it are still miniscule (why is that word flagged as a misspelling?)
The advantages of a capacitor are:
Charge almost instantaneously (how fast depends on the construction of the capacitor, series inductance due to leads, parasitics, rc time constant, etc…)
Discharge almost instantaneously (depends on construction again, since parasitics will take effect here as well, also rc time constant, etc…)
