Statement (I): Hollow shafts are preferred in propeller shafts of airplanes.
Statement (II): Use of hollow shafts affords considerable reduction in the weight of the shaft for equal performance.
For same weight strength of hollow circular shaft is greater than that of solid circular shaft the
weight of hollow shaft will be less in hollow shaft most part of the material is away from the
centre and shear stress increases as distance from centre increases. Hence, material strength
is properly utilised.
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