Hydromatic Propellers

Question 1

Where do you usually find Hamilton standard hydromatic propellers?

Answer 1

Medium and large radial engines (almost obsolete)

Question 2

Hamilton standard hydromatic propellers are similar to?

Answer 2

constant speed propellers

Question 3

Hamilton standard hydromatic propellers consists:

Answer 3

• The hub (barrel) assembly
• dome assembly
• distributor valve

-Anti-icing assembly

these 3 asssemblies work together to permit “constant speed operation”

Question 4

The _____ assembly is the basic propeller mechanism. It contains both the blades and the mechanical means for holding them in position.

Answer 4

hub assembly

Question 5

The ____ assembly contains pitch changing mechanism for the blades.

Answer 5

dome assembly

Question 6

dome assembly consists of:

Answer 6

Rotating cam
fixed cam
piston
dome shell

Question 7

When dome assembly is installed in the prop hub _____ cam remains stationary. The _____ cam, which can turn inside the fixed cam, meshes with gear segments on the blades.

Answer 7

fixed cam, rotating cam

Question 8

_____ operates inside the dome shell and converts engine and governor oil pressure into forces that act through the cams to turn prop blades.

Answer 8

Piston

Question 9

____ ____ provides oil passage for governor or auxiliary oil to the inboard side and for engine oil to the outboard side.

Answer 9

distributor valve / engine-shaft-extension

Question 10

distributor valve / engine-shaft-extension is used with props that do not have ______ capabilities.

Answer 10

feathering

Question 11

What is the major difference of Hydromatic props to constant-speed propellers?

Answer 11

“pitch-changing mechanism”

Hydromatic propellers doesn’t have counterweights.

Question 12

Main advantage of Hydromatic props are the large _____-

_____ range, _____ and _____ features.

Answer 12

blade-angle range, feathering, reversing