CRT.5 B/L Parts list..................

[IBJAMMIN]

I like the UBEC because it puts out 6v vers 5.2v the ESC puts out and it was aready wired into my ESC from my CRT. :) Do you need it on 3s? probably not but as BrianG said heat can be a factor although I have been running my RC18B on 4s with the Mamba and Quark ESC's without a UBEC and have not seen any heat issues I believe the small servo and weight is the reason it works in the RC18's?

Your going to have to come up with a battery mount? Keep in mind an added benifit of the mount is it also makes a great chassis brace and eliminates a lot of the flex in the chassis. :)