Final answer:
Electrical power for propeller deicer systems in aircraft is transferred from the engine to the propeller hub assembly using a rotating shaft arrangement.
Step-by-step explanation:
In aircraft, electrical power for propeller deicer systems is typically transferred from the engine to the propeller hub assembly using a rotating shaft arrangement. The engine generates electrical power, which is then transmitted through a generator to produce the necessary electrical current. This current is then transferred through the rotating shaft to the propeller hub assembly, where it powers the deicer system.