ByLoudDesign

Got a project I'm designing for a client and he desided to go electric. It is a 1:12 scale Lockheed P-3 Orion, we estimate to end up weighing ±40 pounds. I spent the weekend so far looking up motors and ESU. If I figured the thing right from ther reference data I have viewed I need 3000 to 4000 watts. Which convert to 750 to 1000 watts per engine. With multi-motored A/C do you need some sort of equalizer to keep the engine putting out the same. Any recommendation would be sincerely appreciated, I am totally new to electric!

DaveFlynn

Castle Creation's HV-45 ESC's are nice, I have two which have powered 4130-380 (stator 41mm x 30mm, Kv=380RPM/Volt) motors spinning 13x6 props from a 12S (48 volts) battery. When running a matched setup from a common battery the rpm on the two is as close as my rpm meter can measure, within 100 rpm.

ByLoudDesign

So would I run like the two outboard motors on one ESU and the two inboard motors on another one? I do appreciate your help!

DaveFlynn

No, each motor needs it's own ESC. Brushless motors are externally commutated.

ByLoudDesign

So I take it you get good motors and they will perform reasonably well together without external help?

ron_van_sommeren

Careful with too long battery wires. ALL controller manufacturers say the same, long battery wires will kill controllers over time! Extend motor wires instead. If you cannot but extend the battery wires, you have to install extra ESC input capacitors.
Manufacturer/expert statements, rules of thumb, capacitor type, 'watery' explanation:
http://www.rcgroups.com/forums/showt...highlight=kill

I hope you don't mind me asking this but should you be doing this 40pound scale project, the electric drive part of it that is, if you have to ask these rather fundamental questions? Or are you just playing it safe Z looking for second opinions?

Vriendelijke groeten Ron