# At peak power, the propeller of the wind generator produces 3 MW of power at 34 rpm. Based on this..

At peak power, the propeller of the wind generator produces
3 MW of power at 34 rpm. Based on this criterion, choose a material from
Appendix B, and design a propeller shaft, with a hollow circular cross section
in which the inner radius is 75% of the outer radius, that has a factor of
safety FS = 2 (see Example 4.8).

Example 4.8 Design of a Drive Shaft

The power (work per unit time) transmitted by a rotating
shaft is P = T_, where T is the axial torque and _
is the shafts angular velocity in radians per second. The maximum torque
produced by the engine of the car in Fig. 4.45 occurs
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At peak power, the propeller of the wind generator produces
3 MW of power at 34 rpm. Based on this criterion, choose a material from
Appendix B, and design a propeller shaft, with a hollow circular cross section
in which the inner radius is 75% of the outer radius, that has a factor of
safety FS = 2 (see Example 4.8).

Example 4.8 Design of a Drive Shaft

The power (work per unit time) transmitted by a rotating
shaft is P = T_, where T is the axial torque and _
is the shafts angular velocity in radians per second. The maximum torque
produced by the engine of the car in Fig. 4.45 occurs at 4750 rpm, when the
engine is generating 286 horsepower (hp). Design a drive shaft for the car that
is constructed of steel with yield stress _Y = 80, 000
psi and has a factor of safety FS = 2. (Although the shaft is rotating, assume
that the maximum shear stress can be adequately approximated by assuming that
the material is in equilibrium.)

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