Many people believes that propeller governor located inside spinner. It is WRONG. You will see if you see real one. this is the propeller governor of Piper Seminole(PA44). It is located in front of the engine. and it is mounted sideway. Piper Seneca(PA34), Beechcraft Baron(BE55) also have governor here.The picture below is the governor of Piper Arrow(PA28R-201). It is mounted back
of the engine sideway. You can see the rod which is controlled from cockpit to change the setting. Most of the airplane has the governor on either front or back of engine.
