Waynemarlow
10 kW
In reverse thinking with the motor off. The drive side pedals are connected directly through the torque sensor and then on to the non side by a shaft, which has 1 roller bearing on either side and is separated from the motor main gear by the sprag clutch.
The only drag we should get is the grease and roller bearing friction within the bearings and the two water seals along that main shaft. In practice though the springs holding the sprag clutch activating mechanism against the inner race, which is connected directly to the main shaft and the large volume of grease within that quite large diameter sprag clutch, is enough to ever slowly slightly rotate the main gear which can be felt at the pedals as a back ground notchiness ( main gear teeth rotating the blue gear ) the faster you pedal.
The only drag we should get is the grease and roller bearing friction within the bearings and the two water seals along that main shaft. In practice though the springs holding the sprag clutch activating mechanism against the inner race, which is connected directly to the main shaft and the large volume of grease within that quite large diameter sprag clutch, is enough to ever slowly slightly rotate the main gear which can be felt at the pedals as a back ground notchiness ( main gear teeth rotating the blue gear ) the faster you pedal.