Sizing ESC's

[Glenfilthie]

Hi all ~ I have a Bat Bone kit inbound, hoping to put together a V Tail as per David's build...but I have a question. He seems to be calling for motors that I can order...but ESC's that I can't find on the Hobbyking website. I will probably have to go with some other ESC.

On his list he calls for the Turnigy SK3 2822 - 1275kV motor. For ESC's, he calls for Multistar 15A...and I can't find those.

So here is my question: I read somewhere (it may have been the Hobbyking site) that the common practice for selecting ESC's is to go with the motor's max amperage draw and add 10% to select the proper ESC. The motors David is running have a max 8A in the specs. Why isn't he running a smaller amp ESC? Am I misunderstanding something here...?

Also, does anyone have any idea how to confirm shipping ETA's with Flitetest?

 

[mikemacwillie]

ESC current ratings can sometimes be a little optimistic. Oversizing them a bit if generally a good idea, and adds a bit of a safety margin. If the max draw of the motor is 8A, a 12A ESC should be plenty. I'd bet he went with the 15's either because it's what they had around, or because the cost difference between the 15A and a similar but lower current rated ESC was minimal.

 

[JAG]

Just go with 20a rated ESC's. Won't hurt to go larger, barley any size or weight difference and leaves room for upgrading. I put 20s on mine.

 

[IFlyRCstuff]

A little extra is good, but not to much (like 40A).

 

[mikemacwillie]

30A would be fine too. The motor will draw what it needs. The only reason not to is cost vs benefit.

 

[Ace2317]

This is the ESC I use on my Bat Bone. The motors are Suppo 2208/14 1450kv. It flies great with this setup on a 2200mAh.

Here's the link:
http://www.altitudehobbies.com/brus...k/ipeaka-22a-brushless-multicopter-esc-simonk

 

[Glenfilthie]

Well thanks for that fellas!

I guess my airframe just shipped today...I feel like a kid waiting for Christmas!

 

[IFlyRCstuff]

Don't we all
Happy Flying