Variable pitch propellers Page: 3 of 6
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D is held stationary but C may be rotated by the pilct about
the axis 0-0'. It is obvious that, regardless of the rotat-
ion of the propeller, any rotation of C with respect to D
causes a &orresponding displacement of A relative to B, thus
changing the angle of the blades.
The Varga'ole Pitch Propellar used on the
Clement Bayard Dirigible.
The crooden blades are held in two metallic sockets
whioh are swivelled in sleeves attached to the propeller
hub, a thrust bearing holding the. blades against centriu-
gal force. A bevel gear, concentrio with the axis of rot-
ation, is meshed a th two bevel seotors fastened to the
ends of the blades. The shaft on dhioh this bevel gear is
mounted is out with helical grooves whioh are engaged by
fingers projecting internally from a sliding collar sur-
rounding the driving shat. This collar is moved by the
pilot through a control rod operating against a ball thrust
This propeller is also arranged so that the thrust
may be measured. In order to aooomplish this the driving
shaft is made in two sections and the torque is transmit-
ted from one to the other by means of lugs bearing on roll-
era, thus permitting longitudinal motion. Thrust is re-
sisted by a manometri capsule, by means of which it can
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Bacon, D. L. Variable pitch propellers, report, November 1920; (digital.library.unt.edu/ark:/67531/metadc53614/m1/3/: accessed January 21, 2019), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.