| 31. | The distinction between a worm and a helical gear is that at least one tooth persists for a full rotation around the helix.
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| 32. | The gearbox was a four-speed and reverse constant-mesh unit, with helical gear trains for second and third gear.
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| 33. | Their advantage over the helical gears is that the side-thrust of one half is balanced by that of the other half.
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| 34. | The engine has a 2.7 : 1 Propeller Speed Reduction Unit ( PSRU ) with helical gears in an oil bath.
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| 35. | In a stable orientation, the helical gear faces are oriented so that each axial force is directed toward the center of the gear.
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| 36. | If the gear in a worm-and-gear set is an ordinary helical gear only a single point of contact is achieved.
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| 37. | In a helical gear, however, a plane can be normal to only one tooth at a point lying in the plane surface.
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| 38. | A helical gear pressed in No . 3 counterweight drives twin contra-rotating balance shafts in the shaft housing within the lower crankcase.
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| 39. | If a helical gear is being roughed out, then the table rotates and moves along the vertical axis to interpolate the helical path.
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| 40. | The two propellers are powered by two meshing and counter-rotating shafts, powered by helical gear wheels running in an oil bath.
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