T4 Quadcopter Drone Modified Arm

This is a modified arm for the T4 Quadcopter (full size). Changes made:

1. Removed half of the middle section to make room for ESC's, particularly ones that have LED lights on them allowing them to be seen.
2. Created vent holes where the motors mount in order to help with motor cooling.
3. Added slots on arm so that zip ties can be used to tie down ESC's.
4. Minor chamfering done to arm end to help assist with inserting into the T4 body.