Brand New in box - brought a project I wont complete,

https://www.motionrc.com/products/freewing-90mm-12-blade-edf-8s-power-system-w-4075-1350kv-inrunner-motor-e72215

Freewing 90mm professional EDF power system Mark II

With the increasing demand of some consumers for thrust, we officially launched the 90 series second-generation metal frame ducted fan power system

The second-generation version of the power system uses a new casting mold. Compared with the outer metal frame of the previous generation, the weight is reduced by 5 grams. The casting process is higher, the product wall thickness is uniform, and the surface is smoother. Importantly, the spoiler has been redesigned and the airflow rate has been increased by 7%.

The new fan blade, optimized again the blade airfoil and pitch, is more efficient. At the same time, under the premise of the same output power, compared with the previous generation product, the maximum rotation speed has been reduced

In order to match the newly designed ducted fan blades, the motor parameters are also adjusted accordingly this time:

• 8S version is changed from the original 4075-1390kv motor to 4075-1350kv

The theoretical maximum rotation speed is reduced by 7000 rpm respectively. Without changing the design of the main body of the motor, the work potential of this series of motors is further released. At the same time, the motor structure is optimized, and the weight is reduced by 22 grams.

The new power system, under normal use, the maximum power of these two motors has been improved:

• 8S version is increased from the original 3000w to 3100w;

During the actual thrust test, the thrust values we obtained are as follows:

• 8S, current 105 to 110A, thrust 5.5kg~5.7kg

(Current 95 to 105A, thrust 5.0kg~5.2kg, the first generation old version)

As a separately selected professional version, compared with the standard version pre-installed in the aircraft, the thrust value is further extended, and the most extreme thrust is obtained.