Constant-Speed Props Require an Engine Mounted Governor
DescriptionConstant-speed propellers require an engine mounted governor to control RPM. New engines from Van's have a governor drive and mounting pad, but do not include the governor. A governor is included in the FWF kits when appropriate.
Van's offers governors from MT and Hartzell. Both are high quality, affordable products, that can be used interchangeably. An MT governor can be used with a Hartzell prop and vice-versa.
Van's also has a control cable attach bracket that fits both Hartzell and MT prop governors sold by Vans, VA-153-PC. This (or equivalant parts) is included in the FWF kits that require it.
The PROP GOV HZ IO-540 and PROP GOV MT P-860-5 are used on wide deck IO-540 engines with forward mounted governor drives similar to the IO-540-D4A5 sold by Van's, with a 0.947:1 drive ratio. It may not work properly on other 540 engines.
The PROP GOV MT P-860-4 and PROP GOV HZ 320/360 are used on rear accessory case mounted (I)O-320/360 engines with a drive ratio of 0.866:1. All 4 cylinder Lycomings sold by Van's use this drive type.
The PROP GOV HZ IO-390 is a Hartzell governor for IO-390 Lycoming as used on the RV-14/14A.