Replacing Propellers; Blade Guard - UBSAN Q4 Instruction Manual

9 REPLACING PROPELLERS

The Q4's propellers are not identical. Each propeller is labeled with an A or B. When installing
replacement propellers, be certain to install as shown below. The Q4 will not y, and will ip
and crash if the propellers are not installed correctly.
Install Propellers: Pinch the propeller hub, align the hole to the motor
shaft, and press it straight down rmly but gently.

BLADE GUARD

B
FRONT
A
11
A
B