IN the design of hypothetical airscrews an4 general investigations on performance thc calculations are often based on values of torque and thrust coefficients from a family of airscrews or by the use of Lock's method assuming an elliptical grading. It is sometimes desirable to ascertain whether the corresponding stresses in thc blades are satisfactory. This is a laborious process as far as the aerodynamic bending stresses are concerned, since before calculating thc bending moments at each section, it is necessary to calculate the aerodynamic forces.
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