Construction

Question 1

Most common wood used in wooden propeller construction

Answer 1

Birch

Question 2

How many laminates bonded with aero glue

Answer 2

5

Question 3

What 3 materials is a metal spar made from

Answer 3

Titanium , aluminium or stainless steel

Question 4

How is composite propller filled with

Answer 4

Low density foam or honeycomb

Question 5

What’s the shell made of in a composite propeller

Answer 5

Fibreglass , kevlar , carbon fibre

Question 6

What paint used for composite propellers

Answer 6

Polyeurothen paint

Question 7

Protective parts of composite constitute

Answer 7

Heating element & metal guard

Question 8

Why is wooden propeller left to rest for one week

Answer 8

Even moisture distribution

Question 9

How are aluminium propellers polished

Answer 9

By machine

Question 10

How are alluminium propeller shaped

Answer 10

Master blade

Question 11

what’s the 2 final processes of aluminium propeller construction

Answer 11

Balanced & Anodised

Question 12

What is the name of the wooden propeller after rested for a week

Answer 12

Propeller white

Question 13

Why do we fabric sheath

Answer 13

Added strength

Question 14

How are ground adjustable propeller blade angle changed

Answer 14

Only on ground

Question 15

In a ground adjustable propeller what’s the blade angle range

Answer 15

7-15

Question 16

How is blade angle checked

Answer 16

Propeller protractor at master reference station

Question 17

Variation between blades

Answer 17

Max 0.1 degrees

Question 18

Max desired blade angle

Answer 18

Max 0.1 degrees of desired blade angle

Question 19

What does controllable propeller pitch change mechanism allow you to do

Answer 19

Pilot can change pitch of propeller during flight

Question 20

What position in the propeller pitch change mechanism

Answer 20

Two position selector or variable pitch within min and max setting

Question 21

Two aircraft controls

Answer 21

Throttle control (hg) & propeller control

Question 22

How is constant speeding propeller designed in regards to pitch

Answer 22

Change blade pitch to allow it to maintain constant RPM

Question 23

What does a constant speeding propeller use

Answer 23

Constant speed unit or Governor

Question 24

How is constant speed unit controlled

Answer 24

Electrically controlled

Question 25

What principle does constant speed unit work on

Answer 25

Centrifugal force

Question 26

What spring and weights does a constant speed unit use

Answer 26

Speeder spring & set of fly weights

Question 27

What is tipping material

Answer 27

Brass , stainless steel , Monel and terneplate

Question 28

What are water drains for

Answer 28

Allows wood to breathe 3 #60 3/16 deep holes in tip

Question 29

How is metal tipping secured

Answer 29

Cooper rivets

Question 30

What does polyeurthene do

Answer 30

Provide mechanical and ultra violet protection

Question 31

What do we use plastic instead of

Answer 31

Sheathing

Question 32

How are steel propellers made

Answer 32

Hollow or solid

Question 33

How are hollow metal propellers made

Answer 33

Folded sheet welded over ribs

Question 34

What are hollow metal propellers filled with

Answer 34

Foam filled to dampen vibration

Question 35

Where is the propeller master refrence measured from

Answer 35

Distance measured from centre of rotation

Question 36

Master reference for fixed

Answer 36

75%

Question 37

Master reference for variable rotor

Answer 37

50-75%

Question 38

What does the dome assembly encase

Answer 38

Pitch change mechanism

Question 39

Fixed pitch propeller optimum performance

Answer 39

200kw

Question 40

Fixed pitch propeller speed

Answer 40

250km/h

Question 41

Why is a fixed pitch propeller favourable

Answer 41

Production and maintenance costs

Question 42

What’s the best condition for fixed pitch propeller and the optimum AoA

Answer 42

Cruise condition and 4 degrees

Question 43

What’s a bad thing about fixed pitch propellers in regards to the pilot

Answer 43

Pilot intensive as they have to keep checking parameters

Question 44

Where is blade angle adjusted on ground adjustable propeller

Answer 44

On ground

Question 45

Ground adjustable propeller blade angle

Answer 45

7-15 degrees

Question 46

What’s the two aircraft control

Answer 46

Throttle and propeller

Question 47

What does throttle do

Answer 47

Regulates power output on manifold pressure gauge

Question 48

What does propeller control do

Answer 48

Regulates engine RPM & propeller RPM

Question 49

What is low propeller pitch used for

Answer 49

Climb

Question 50

What is high propeller pitch used for

Answer 50

Cruise

Question 51

Advantage of constant speed propeller

Answer 51

Blade angle reduces torque, also this increases rpm/airspeed

Question 52

When does a spinner need to be inspected

Answer 52

Regularly due to high aerodynamic loads

Question 53

Why is there limited repairs on a spinner cone

Answer 53

Because any cracks are foundthey need to be replaced

Question 54

What’s a blank

Answer 54

5 layers of wood laid down and glued together