Variable pitch propellers Page: 4 of 6
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Variable Pitch Propelle Used on Itagian
This propeller has four blades and is built entirely
of metal. The inner end of each blade is cylindrical in
form and is pivoted in a socket in the hub where it is
held by suitable bearings against centrifugal foroe. Each
blade carries a small lug, joined by a link to a central
control rod located inside the hollow drive shaft. This
rod is splinsd to the shaft but may slide axially, thus
causing the blades to rotate about their o~wn axes. Con-
trol is effected through a collar surrounding the shaft,
operated by means of a rook and pinion acting against a
ball thrust bearing.
The Levasoeur Variable Pitoh Propeller.
Each blade is built up of wooden laminations in which
are securely embedded the ends of eight threaded rods. The
butt end, which is cylindrical, fits into a steel cup, the
bottom of whioh is pieroed by eight holes through which
the ends of the rods project. These are held by nuta on
the outside in order to resist centrifugal force. A cap,
the internal bore of whidh is conical, is screwed onto the
other end of the cup. This fits a corresponding conio a
portion of the wooden blade and serves to hold it against
vibration and may be used to take up any looseness resulting.
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Bacon, D. L. Variable pitch propellers, report, November 1920; (digital.library.unt.edu/ark:/67531/metadc53614/m1/4/: accessed December 12, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.