問題一覧
1
Rotating propeller imparts rearward motion large mass of air at
low velocity in a rearward motion
2
Right handed propeller
Rotates in a clockwise direction when viewed from aft - looking forward.
3
Blade angle (pitch angle) is the angle between blade
chord line and plane of rotation.
4
If the blade angle increases
the pitch becomes coarser.
5
When a propeller is not driven by the engine in flight due to engine failure
it will create less drag in feather position
6
RPM & Centrifugal twisting moment CTM are
directly proportional as propeller RPM increase CTM will increase.
7
Contra-Rotating Propeller are propellers driven byContra-Rotating Propeller are propellers driven by
the same engine on the same shaft, but each propeller rotating in difference direction.
8
The fixed pitch propeller traveling at different speeds at constant RPM, if the blade angle is fixed
The angle of attack will change with variation of forward speed
9
As the propeller moves through the air
it will produce thrust & torque
10
●Effective pitch is
the actual distance a propeller moved in one revolution.
11
Propeller Efficiency is the ratio of
the useful work done by the propeller to work done by the engine.
12
propeller Solidity is the term used to describe
the ability of the propeller to absorb power from the engine.
13
●Solidity of a Propeller can be increased by:
Increasing the blades chord and increasing the number of blades
14
Propeller blades are twisted to
maintain angle of attack the same value along the blade.
15
The blade angle at the root is
greater than the tip.
16
Centrifugal twisting moment CTM pushes the blade toward
fine pitch.
17
From reverse pitch to return to normal pitch it
Passes through fine angle
18
Windmilling propeller cause
small negative angle.
19
Windmilling causes
maximum propeller drag.
20
blade station
distances that are measured in inches along the length of a blade from the axis of rotation or hub center-line
21
Propeller torque is the resistance offered by the propeller
to the rotation