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They found that all helical rotors have a positive coefficient of static torque at all rotor angles, but the rotors with a shaft had a lower power coefficient than those without.
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The Bach rotor had a high value of power coefficient Cp; but it had negative values of static torque coefficient.
Similarly, the helical rotor had a lower value of the power coefficient than the Bach rotor but it could provide positive values of static torque coefficient.
Tests were conducted to evaluate the power coefficient, torque coefficient and static torque coefficient for each rotor.
The experimental results indicate that the helical Bach rotor had the highest power coefficient and static torque coefficient compared to the helical rotor.
Using these experimental data, the authors calculated aerodynamic characteristics such as drag coefficients, static torque coefficients, and power coefficients.
There is no evident relation between the load and the coefficient of static friction.
A solid lubricant at operating temperature was found to reduce the coefficient of static friction.
In science they call this "overcoming the coefficient of static friction".
For most surface interfaces, the coefficient of kinetic friction is less than the coefficient of static friction.
The numerical results were more accurate and gave positive values for combined drag coefficients and the total static torque coefficient.
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CEO of Professional Science Editing for Scientists @ prosciediting.com