the 9920 - RC-Monster Forums

neweuser · **the 9920 -** 03.21.2006, 05:34 PM

I'm more than likely going to go with 14 cells with this, with a 9l or maybe 8xl. If i want to get something a little bigger later, which will probably be the case, and use more cells like 16-20? will this controller take it? Or would i need to go with something different?:032:

03.21.2006, 05:56 PM

that controller will be fine

coolhandcountry · 03.21.2006, 05:57 PM

It would really depend on what you planning on running. The 9920 runs on 20 cells pretty good. I run mine on 20 regularly. 14 cells I would go 10L over the 9L.

neweuser · 03.22.2006, 09:54 AM

Thanks guys!!! If i'm going with 16-20 cells, what motor would you recommend?

captain harlock · 03.22.2006, 10:20 AM

Any of the XLs will excel with a 16-20 cell setup.

neweuser · 03.22.2006, 11:01 AM

Is it the lower the number is how many turns and will go faster?
For example, 7xl will be faster than let's say 9xl?

nitrostarter · 03.22.2006, 02:14 PM

If you planned on using more cells late you, you might want to go on and get the XL now. It'll perform fine on 14 cells now and even better on the 16-20 cells u want to run later on.

The difference between the 7XL and 9XL is the number of RPM's the motor spins per volt. Technically speaking the 7XL spins faster and might be a faster motor, but the 9XL can take more cells and make more power which in turn you can use to gear higher and make more speed.

neweuser · 03.22.2006, 02:52 PM

thanks, that is exactly what i needed to know man!

coolhandcountry · 03.22.2006, 03:48 PM

A 7xl on 20 cells is going to be one hot motor.

neweuser · 03.24.2006, 05:26 PM

when u say hot, you mean temp wise right?

coolhandcountry · 03.24.2006, 06:13 PM

yep. it is going to get hot enough for you not to touch.

Serum · 03.25.2006, 01:44 AM

And the currentdraw will be skyhigh.

if your goal is to use a 14-20 cells, the 9 or 10XL would be my choice.

neweuser · 03.29.2006, 12:22 PM

Does anyone have a link for the XL's i can go to so i can check them out? Are there good "package" deals that maybe Mike would suggest?

Serum · 03.30.2006, 06:48 AM

on www.bk-electronics.com, just a few clicks away.

What is it you want to know?

Scott711 · 04.01.2006, 12:49 PM

I'm currently experimenting with this setup 7XL/9920 combo with 16/51 gearing on 5S lipos. It's a bit to hot for my liking (150+ on speed controller and motor but batts are good 100-110). I'm going to hook up some cooling fans and see if that keeps things a little cooler. If not I'll drop down a couple teeth in gearing and see what happens.

The speed and torque with this setup is crazy fun though.;)