Wooden Propellers

Question 1

Wooden propellers are fabricated from a minimum of ____ layers of laminated kiln dried wood but can be up to ____ layers thick.

Answer 1

5, 10

Question 2

_____ stage lets the moisture distribute evenly through all of the propeller laminations.

Answer 2

prop white stage

Question 3

Some propellers have a black or grey plastic coating to protect the wood known as ______ _______.

Answer 3

Armor Coating

Question 4

______ ______ can be installed on the leading edge to protect against FOD. Secured with countersunk rivets and solder.

Answer 4

Erosion Shield

Question 5

Why do we drill holes into the tips of the erosion shield?

Answer 5

this will allow moisture to escape via centrifugal force

Question 6

When do we know if the prop is balanced?

Answer 6

If it stops on random spots

Question 7

How do we store Wooden propellers?

Answer 7

Horizontally for even moisture distribution and prevents from warping and keeps balanced

Question 8

Advantages of wooden props:

Answer 8

absorbs engine vibration that metal props

Does not support resonance

Lighter than metal props

Low cost

Question 9

Disadvantages of wooden props:

Answer 9

more susceptible to abrasion and damage

difficult to fix

more maintenance

moisture swelling can change attach bolt torques

unequal moisture distribution can cause dynamic imbalance

glue condition, moisture content , warping, rotting, varnish, condition of wood laminations