Propeller Owner’s Manual
175
INTRODUCTION
61-00-75
Page 1-12
Rev. 1 Jun/11
Term
Definition
Underspeed . . . . . . . . . The condition in which the actual
engine (propeller) RPM is lower
than the RPM selected by the pilot
through the propeller control lever
Variable Force . . . . . . . A force that may be applied or
removed during propeller operation
Vertical Balance . . . . . . Balance between the leading
and trailing edges of a two-blade
propeller with the blades positioned
vertically
Windmilling . . . . . . . . . . The rotation of an aircraft propeller
caused by air flowing through it
while the engine is not producing
power
OBSOLETE PROPELLER MODELS. SEE COVER PAGE
WARNINGS AND SERVICE BULLETIN HC-SB-61-331
