Hi guys, I recently purchased a 210-size frame and I really would appreciate your opinion on what ESC's and motors I should use. I was thinking at the little bees 20Amp or 30Amp + EMAX rs2205 2300kv using 5040 triprops or 5045BN, Naze32 rev5 and the MXK PDB+OSD(just wanted to test it to see how it works) from banggod.

Thanks for your help

that's sounds like a good setup there
I would have run the same setup for my new build... if I haven't got so many spare cobra motors hehe

and you shown me a good PDB interesting with OSD as well!

http://www.banggood.com/MXK-Power-Distri...31375.html

Thank you for your reply Oscar, I think the 30A would be better for those motors because I saw that they can draw up to 25A. Or do the 20A have also something like a burst Amp draw? Because o course I will not go full power all the time ?

yes... and no...
25A is the current draw at 100% throttle... unless you fly at 100% throttle all the time, 20A normally is enough.
the Littlebee ESC has a burst current of more than 25A which means it should survive 25A for a short time.

20A ESC is a lot lighter than 30A ESC, by using 20A you will probably be saving 20g+ with your build, that would be the main reason why I choose 20A over 30A whenever possible.

But... that would be the decision down to you I am not saying 20A is definitely safe, there will be risk if you don't want to take risk then use 30A

30A it is then, I don't like to see fire where it's not supposed to be

I think the 20A RotorGeeks or LittleBees should be fine. They are rated for 30A bursts of 10 seconds. That is 120A for 10 seconds - probably enough to get you half way to the moon
At that current, I'd be more worried if the PDB and LiPo can handle it. I've heard that the 30A ESCs tend to produce voltage spikes at hard maneuvers that burn some VTX, so another thing to keep in mind.

I've heard good things about the EMAX RS2205, I have a batch coming in the mail too. I've flown the following worth mentioning:

1. DYS 1806 2300KV - very solid little motors, good for super light builds. They are not crazy fast but are so durable, crash after crash and run great on 4S.
2. Cobra 2204 1960KV - again solid work horse, flies fast enough on 6" props and overall efficient
3. Rotorgeeks 2204 2300KV - that is my Formula1 build. Crazy fast and light but also finicky, the bell needs retightening and alignment often, the bearings are starting to go as well.

Besides that a friend swears by the Cobra 2204 2300KV - the only thing he runs. I've seen him rip with those hardcore many times. I might consider getting a batch myself.

For PDB I highly recommend the "Birdseye Mini 36mm V1.2 PDB", pirofliprc.com used to have them but he is out right now. The connector placement and overall board thickness and quality are the best I've seen.

Hope that helps.