Sorry I didn't see that post earlier, so opened my own thread. Electcial current has nothing to do with Duchess propeller. Propeller feathring has to do with the prop governer. Prop governor uses mechanical linkage and oil pressure to control the prop. If you move RPM leverage into feather position, the speeder spring via pistons adjust propeller pitch into the feather position. Propeller doesn't windmill in this position. In fact, the whole idea of feathering is to reduce drag from windmilling prop. In order to unfeather, RPM leveler must be moved to full forward position. Then nitrogen is used to pushe blades from feathered position to the acceptable AOA and they start windmilling. However, prop would not windmill below 100 IAS, so there must be some good airflow. Here in states we don't certify people to fly Duchess with just give them multiengine rating. Multiengine rating give them ability to fly nearly any pistion twin engine which doesn't require a type rating. The most commonly used aircraft are Beech Duchess and Piper Seminole. During multiengine training usually applicant perform at leats one complete shut down and restart....Nedless to say they learn all systems including IO360 and prop gverner..