Motorstar NA: Radial Aircraft Engine Sales And Service

Type ................................................. R-2, series 04

Drive ................................................ From engine

Direction of rotation ................................ RH viewed from governor drive end

Engine crankshaft-to-govemor drive transmission ratio. 1:1.045

Governor drive shaft rotational speed..................1400 to 3085 RPM

      (engine speed in this case is 1340 to 2950)

Operating principle ............................ ......Centrifugal-hydraulic

Operation pattern ... .................................One-way, positive

Working fluid .................................. ......Engine Oil  from engine

Oil pressure at governor pump inlet:

Operating pressure ....................................42-65psi

Idling ....................................... ........At least 14 psi

Maximum pressure at governor outlet at 2500rpm,zero flow and oil

temperature of 185 to 195 °F ..................... ......213±15psi

Oil temperature at governor inlet:

Minimum permissible .......................... ........104°F

Recommended ................................... .......120 to 150°F

Maximum permissible .......................... ........195°F

Maximum temperature at governor outlet ......... ......212°F 

Oil leakage through gaps at 2500 rpm, zero flow and temperature of 185 to 195 °F:

At acceptance tests ...................................Up to 1.5 qt/min

By end of service life ....................... ........Up to 2.1 qt/min 

Governor oil pump output at 2500 rpm, outlet pressure = 115 psi and

temperature 185 to 195 °F .............................Not less than 7.9 qt/min

Control Arm Rotation angle for operation:

From fine pitch stop (full clockwise, spring released) to full coarse pitch: 160°