Hummina Shadeeba said:
Wuz up all. I just returned the alien double 150amp esc and 4200watt double motors after reading this thread. Seems people aren't getting near 150amps or even 120. I'd rather save a bundle and go with one or two of these. And that's my question...I want to build a double motor and wondering if I should get a double esc that's about 120amp or two 60amp. I'd also like it to have a bec to power the receiver.
Am I missing something in this decision? Was going to get the turning 5056 motors or something similar. There's about a 240kv and a 280 one. Guess I should go with two of the 240kv ones
A positive that's been stated here of having 2 separate escs is that you can always replace one if it breaks leaving you still with a working board for the meantime, but with a 2-in-1 you'd have to replace the whole thing leaving you with no board. If you're going for a sleek, aesthetic appeal and have the $$$, then go with an Alien esc. Dirkdiggler has had success with his 90a boat esc, so you'd be safe with that. Seeing as you don't already have a 90a, I believe he recommended going for a 120a to be safe. It seems that lots of esc's have built in bec's, so you might as well refine your search to those unless you plan on soldering your own bec.
I'm running on a single 5055 280kv and so far so good. I've only pushed it to 80% throttle (esc setting "20% throttle limit") and I'm afraid if I go full I'd have problems. It does get very hot after a 1 to 2 mile run but since you're planning a dual setup, the two motors will be working together and in theory you won't have any problems. Ultimately, it depends on how much potential top end speed you want. If you get the higher kv, then you can work with gearing options to tame your speed. This is an invaluable tool: http://scriptasylum.com/rc_speed/top_speed.html
I found it here from user Nieles: http://endless-sphere.com/forums/viewtopic.php?f=35&t=57644&hilit=245kv