mCPX

Brushless motor "poles" and how to count them

helis: 

A motor's top speed (RPM) is determined by several things but one that is useful to be able to discover is the number of poles. Normally we don't need to worry about this as the KV value gives a pretty good idea of what the motor will do in terms of revolutions per minute per volt. Sometimes however it's useful to know.. like when setting up governed head speeds in BLHelisuite which I use on the BL mCPX.

mCPX BLHeli settings

helis: 

Here are the settings I'm experimenting with at the moment:

 

BLHeli settings for mCPX, governed at 5000RPM

 

The aim of this particular setup is to find the best settings for 3D flying hence the high RPM. Higher RPM means snappier cyclic response and a little more energy in the rotor system when entering a flip or roll i.e. more RPM at the end of the maneouvre hopefully.

Re-flashing mCPX double ESC with BLHeli firmware

helis: 

 

A quick how-to on updating the Origin/HobbyKing double brushless ESC to the latest BLHeli firmware using BLHeli Setup software.

BLHeli Setup software for windows 

 

mCPX Tail boom extension

helis: 

Today I'm proving the principle that to fly is to crash. During a bit of tail first flying I got the dumb thumbs and while trying to avoid crashing into a tree I managed to pile the mCPX into the ground ...... tail first. The mCPX will take an enormous amount of punishment but they don't like crashing tail first:

mCPX with a broken tail boom

 

mCPX HP03S upgrade with 8 and 9T pinions - test data

helis: 
 
After recently finding the original brushed main motor was not giving me the power it used to (it was also using much more power from the battery than when new and the flight times were getting shorter and shorter) I decided to take the plunge and upgrade to brushless. 
 

Blade mCP X

helis: 

Blade mCP X

 

The mCPX is a very popular airframe for modding and here at Heli Hack we couldn't resist having a go at improving what is already one of the best value for money advanced trainers.