Here's my first stock DTM ..I love it!

[cdog4w]

heh, 46T spur, why not go lower with the mamba, I'm sure it can handle it no problem. I'm running 12/40 and havent lost any acceleration compared to 10/42, or at least not much.

[potentiality]

My rule is if they dont support you, then dont support them. If he wont run a class even if you get enough people.. find a different place to shop.

Anyhow by cap I meant a POWER cap. not a cap for the motor. (Cdog break out the pics).

JR and futuba plugs are intercompatible The fut are nice as you cant plg them in backwords because of the flange. But even if you plug the jr in backwords in wont fry it as its not the positive and negative leads that are switched.... now if you had a airtronics servo or receiver, I can see a problem.

[cdog4w]

http://cstanleyw4.home.comcast.net/rc/dtmsp.htm
power capacitor pics there.

[TJFBryant]

oh...my apologies I didn't know you meant a power capacitor.

Where is the best place to snag one of those...Radioshack?

Also..(sorry for the newbyish question, I never worked with these caps before) Do I mount it between the ESC battery wires and the battery or the ESC motor wires and the motor??

Thanks again for all your help...

Its nice to see these DTM threads still active.

[cdog4w]

I got mine from potentiality who got his from digikey (they have a minimum order of some kind, so he got 5, I picked up 2, he used one and he sold the others). Not sure on the part number, he'd have to fill you in on it.

Radioshack has a terrible selection of caps. Basically you're looking for a few different features in a capacitor for this purpose. You want somewhere in the thousands of uF range, so I've heard of 2000uF, 4700uF is very common, and I haven't seen many go higher at this scale. Smaller size uF will do more to smooth voltage drops and reduce engine noise, higher will actually give you a bit more punch on takeoff. There are whole debates on the optimal capacity since the more capacity, the longer it takes to recharge after dumping it (say on hard acceleration). The other number you need to know is the voltage capacity. It'd be pointless for you to get a 50V cap when all you need is 10V or so, all the extra V capacity does is make the cap larger. Also, don't go by the straight 1.2V rating for this, since many packs peak at higher voltages (my 6 cells peak just under 9V). Finally you can get special purpose capacitors. In this case, potentiality picked up low impedance capacitors, which means low internal resistance and more power to the motor. You'll also see a lot of 4700uF 16V caps which will work fine too.

To solder the cap in, solder it parallel with the batteries to the ESC. So on my spy, I soldered the battery wires on the top, cap wires on bottom of the connection plate.

Finally, since you're about to throw on your mamba, you might not need it. I have no idea how power capacitors interact with brushless systems. I would guess that there is less motor interferance simply due to the design of a brushless motor (which is cool sh**), but maybe thats just because they're hella expensive.

If anyone has anything to add/correct, please do as I am by no means an expert.

[potentiality]

Actually the Mambas are suffering from a slight stuttering/cogging under hard acceleration.. Shawn from the company is sending out power caps to help reduce this from happening..

[TJFBryant]

REALLY...looks like I am going to have to get myself some then...
thanks for the update....I ll keep you guys informed on how everything works out.