Can I pick someone's brain for a sec? KV ESC & Props

[rwehuman]

So I am looking for a new brushless outrunner, I have the Emax 1860 2280kv and the Simple Soarer.
https://www.emaxmodel.com/emax-multicopter-motor-mt1806.html
http://www.stonekap.net/ftplans/FT-SS-TILED-PLANS.pdf

I would like to be able to use any 1 of the batteries I have
1S 800mha
1s 1000mha
2s 2000mha <----will make the SS nose heavy I know

The simple Soarer calls for a 9x4.7SF prop and a 1300kv motor.

So do I go for the 980kv motor which brings the prop in spec for the motor but then the motor is out of spec for the SS?

Or do I go with the 1400kv a smidge over powered for the SS but 9x4.7 is out of spec for the motor?

https://www.emaxmodel.com/xa2212-brushless-motor-accessories.html


And now to the ESC

I was looking at these two.
They both look to be in spec I just dont know which is best, I'm pretty sure I do not need a BEC cause either of the motors are rated for 2Sn power. Is that correct?

Lightning 20A ESC
EMX-AC-1705
https://www.emaxmodel.com/lightning-20a-esc.html

Budget ESC 18A
EMX-SC-0506
https://www.emaxmodel.com/budget-esc-18a.html



I still have my noob card please pardon the entry level questions.

-Chris from Delaware

 

[paulshort]

Hi there. Pretty much the only battery that will work out of the ones you have is the 2s 2000mah. A 1s lipo will not power the SS. For the motor if you are running a 3s battery you want higher KV. KV is how many rpm the motor will do per volt (with no load). I would recommend 1300 kv or above. When running 2s the 9x47 prop will be absolutely fine.

You mentioned a BEC. You always need a BEC regardless of what battery you are running. A BEC takes the battery voltage and separates out a clean 5 volt source of power for the receiver. Without this your receiver will not power on.


Paul

 

[rwehuman]

Thank you Paul.

 

[rockyboy]

When I flew primarily 2S sized planes, I was always happiest with a 2s800mah as a great balance between weight and capacity. I could easily get a 4-5 minute flight on my Tiny Trainer, and 3-4 minutes on my Das Little Stik even with hot-dogging around a bit.


The 18amp ESC you linked to has a built in BEC so you don't need an external unit. Personally, I like to use ESC's with a build in BEC on all planes up to about 40" wingspan. Once I get into the bigger sizes, I like an external BEC so I don't suffer a radio voltage brown-out from pushing the electronics too hard.

And all questions are welcome - we are all noobs at some aspect of this hobby

 

[rwehuman]

rocky, thanks for the thoughts