Hartzell HC-E3YR-7 Owner's Manual page 44

Term
Underspeed . . . . . . . . . The condition in which the actual
Variable Force . . . . . . . A force which may be applied,
Vertical Balance . . . . . . Balance between the leading
Windmilling . . . . . . . . . . The rotation of an aircraft propeller
INTRODUCTION
Propeller Owner's Manual
136
engine (propeller) RPM is lower
than the RPM selected by the pilot
through the propeller control lever.
varied, or removed during propeller
operation.
and trailing edges of a two-blade
propeller with the blades positioned
vertically.
caused by air flowing through it
while the engine is not producing
power.
61-00-36
Definition
Page 1-16
Rev. 2 Feb/17