Hacker Motor GmbH Q80-7L V2 KV155

The Hacker Motor Q80-7L V2 155KV is a large outrunner for electric aircraft. Hacker Motor is a German maker of electric drives for model flying. With a case diameter of 88.5 mm, a length of 89.3 mm and a mass of 1,335 g, the motor belongs to the size class of fixed-wing aircraft that fly as unmanned aeroplanes with a large propeller.

The low KV figure of 155 calls for large propellers: the maker names 27x12 with two blades or 24x12 with three blades. On 12S (44.4 V nominal) the motor turns roughly 6,900 rpm unloaded. It delivers up to 7,000 W for 15 s, a good 5 W per gram of motor mass. From 7,000 W and 44.4 V follow roughly 158 A; a speed controller (ESC) for this drive therefore needs clearly more than that current as headroom. The 15 s is the time basis: the figure describes take-off and climb, not cruise.

The motor is designed for 12S; motor, controller and battery must carry the same cell count. A drive of this size sits in an aircraft whose weight can reach or exceed the open-category limit of 25 kg; anything above flies in the specific category. The EU class depends on the take-off mass of the whole drone, not on the motor, and remote identification (Remote ID) follows from class and type of operation.

With a propeller of 27 inches diameter, bearings and shaft work under considerable imbalance and thrust loads. The checks are shaft wobble after hard landings, bearing play in axial and radial direction and equal resistance across the three phases. The winding ages in heat; anyone who lets the motor run on the ground for long is not cooling it, because there is no airflow. The seating of the spinner and propeller driver should also be checked regularly.