I wanted to be able to use the throttle limiting feature with voltage sensing (with the sick af rpm filters) in BF4.1 so that I could plug in any 4, 5 or 6s battery and fly. Once I plug in, BF would see the cell count and select either profile 1, 2 or 3.

I also wanted to do it with relatively cheap hardware so I wouldn't feel too bad about thrashing it a little bit lol...

The key to the setup is high kv motors. I'm using DYS SunFun 2207 2750kv motors but unfortunately the company has gone away and these are getting hard to find. However, you really want a motor that has at least as high of a kv value as you want to run when plugging in a 4s battery. You can always command a limit to bring it down, even on your 4s profile (I have my 4s profile set to 94% for a kv of @2,585).

Here's a great video I used to set this up...

The frame is the RDQ Source One. Nice and cheap, super tough and flies so sweet! A little on the heavy side but feels good in the air and I know it will take a hit.

A T Motor F4 with a DAL Rocket 45a 4in1 in the middle with a Caddx Ratel 1.66, Rush Tank Mini, TBS Triumph Pro and an Frsky xm+ round out the rest of the build.

Oh yeah!... and CLRacing blue led racewire ;p!

And a HUGE thanks to my friend Justin for the KILLER pics!!!