Gen II
User Manual
4-11 – Propeller Balance
Chapter 4
Revision 2.2, Apr 2020
(Root Mean Square). Typically, you will use Peak if using IPS in the “Vib:” field
above.
4.1.1.1.11.
Move to the “FSR” field and use the [
] key to select the Full-Scale Range for
the vibration amplitude you reasonably expect to encounter on this job. For a
propeller balance conducted using IPS, a normal selection would be 1. This value
should be enough above the maximum allowable vibration for the engine so that
any amplitude in excess of that limit can be readily seen.
4.1.1.1.12.
Move to the “Rotation (FLA):” field for Eng 1 using the [
] key. Using the [
]
key, Select CW (Clockwise) or CCW (Counter-Clockwise) for the rotation of the
propeller as viewed standing Forward of the propeller Looking Aft (FLA) toward
the tail of the airplane
4.1.1.1.13.
Move to the “Rotation (FLA):” field for Eng 2 using the [
] key. Using the [
]
key, Select CW (Clockwise) or CCW (Counter-Clockwise) for the rotation of the
propeller as viewed standing Forward of the propeller Looking Aft (FLA) toward
the tail of the airplane
4.1.1.1.14.
Using the [
] key, move to the “Tach Type” field. Using the [
] key, select the
type of tachometer you are using.
Tach Type selections for this field include:
“Optical” - Includes the Phototach and LASETACH
. This selection will provide
power to the Tach device.
“Mag P/U” - A magnetic pickup. This selection does not provide power to the
Tach device.
4.1.1.1.15.
Using the [
] key, move to the “Tach Chan” field for Eng 1. Using the [
] key,
select the appropriate value according to the analyzer’s tach input channel(s) you
intend to use. The default is TACH 1.
4.1.1.1.16.
Using the [
] key, move to the “Tach Chan” field for Eng 2. Using the [
] key,
select the appropriate value according to the analyzer’s tach input channel(s) you
intend to use. The default is TACH 2.
4.1.1.1.17.
Using the [
] key, move to the “Tach Pos (FLA)” field for Eng 1. Using the [
]
key, select the tach position. The tach position is determined by standing Forward
of the propeller Looking Aft (FLA) toward the tail of the aircraft. From this
viewpoint, determine the approximate clock position (1:00 to 12:00) of the
tachometer pickup.
Содержание Cobra II
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